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Genus Rohea nov.
Genotype: Paradione (Notocallista) trigonalis Marwick, Oligocene, New Zealand.
Shell rather small, suboval, with somewhat narrow, erect, prominent beaks. Surface shining, bearing fine concentric grooves which become irregular and obsolete medially. Hinge-plate broad, flat and solid anteriorly, right hinge with two long anterior cardinals, the anterior slightly stronger, posterior cardinal very short and narrow, bifid; anterior lateral pit distant from the cardinals by its own length and not connected with the anterior cardinal socket by any groove. The lateral teeth are short and raised to a sharp point. Left posterior cardinal separated from the nymph by a groove, anterior lateral not buttressed and with a deep pit ventrally. Ligament well sunk, with high walls. Pedal retractor separated from the adductor. Pallial sinus slightly ascending, tapering, roundly truncated.
The sunken ligament resembles that of Fossacallista and Chionella, but the arrangement of the teeth differs greatly, both from these as well as from any of the Notocallista, Costacallista, or Pitar groups. The long, straight, right anterior cardinals, distant anterior lateral, and unexcavated hinge-plate recall such genera as Aphrodina and Callistina, Dosiniopsis and Marwickia, but there are no posterior laterals as in the last two. The long left posterior cardinal, well separated from the nymph, agrees with Aphrodina and Callistina, and the right posterior cardinal is short and slender as in Callistina. Accordingly, if the hinge is to be taken as a guide, Rohea must be a descendant of the European Cretaceous stock typified by C. plana (Sowby.). The New Zealand Cretaceous Tikia Marw. has a short right anterior cardinal and the hinge-plate anteriorly is well excavated, the right lateral pit communicating with the anterior cardinal socket.
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Fig. 1.—Notocallista (Striacallista) multistriata (Sowby.), juvenile, 2 mm. long, × 25. Fig. 2.—Ditto, 3 mm. long, × 20. Note larger anterior lateral. Fig. 3.—Ditto, 5.5 mm. long, × 12. Anterior lateral buttressed. Figs. 4–6.—Rohea trigonalis (Marw.), n.gen., topotypes, × 1¼. Fig. 7.—Tikia wilckensi (Woods), Upper Cretac., Amuri Bluff, × 1. Figs. 8, 11.—Pitar (Hyphantosoma) sculpturatus (Marsh.), topotype, × 1½. Fig. 9—Chionella ovalina (Desh.), Paris Basin, × 3. Fig. 10.—Notocallista (Fossacallista) parki (Marw.), holotype, × 3. Fig. 12.—Costacallista (Megapitaria) chione (Linné), Malta, × 1. Figs. 13, 15.—Costacallista hectori (Fin. and Marw.), paratype and holotype, × 3. Fig. 14.—Notocallista kingi (Gray), Twofold Bay, N.S.W., × 2½.
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Figs. 1–3.—Notocallista kingi lamarcki (Gray), Gulf of St. Vincent, × 1. Figs. 4, 5, 9.—Notocallista kingi (Gray), Twofold Bay, N.S.W., × 1. Figs. 6, 7, 8.—Costacallista (Megapitaria) chione (Linné), Malta, × 1.
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Figs. 1–3.—Notocallista (Striacallista) multistriata (Sowby.), Stewart Is., × 1. Figs. 4–5.—Notocallista (Striacallista) multistriata ovalina n.subsp., holotype, × 1. Fig. 5a.—N. multistriata ovalina n.subsp. Separate muscle scars of pedal retractor and anterior adductor. Figs. 6–8.—Notocallista (Striacallista) diemenensis (Hanley), Tasmania. × 1. Fig. 9.—Notocallista (Striacallista) submultistriata (Tate), McDonald's Muddy Creek, × 1. Figs. 10, 11.—Ditto, Jimmy's Pt., Kalimna, × 1. Fig. 13.—Ditto, Jimmy's Pt., subtrigonal form, × 1. Figs. 12, 14, 15.—Notocallista (Striacallista) disrupta (Sowby.), Sydney Hbr., × 1.
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Figs. 1, 2.—Notocallista (Striacallista) cudmorei n.sp., holotype, × 1½. Figs. 3, 4.—Notocallista (Striacallista) pestis n.sp., holotype, × 1. Figs. 5, 6.—Notocallista (Striacallista) lutea n.sp., holotype, × 2. Figs. 7–9.—Notocallista (Striacallista) mollesta n.sp., paratype and holotype, × 1. Figs. 10, 11.—Notocallista (Fossacallista) exigua n.sp., holotype, × 3. Fig. 12.—Notocallista (Fossacallista) makoensis (Marw.), Ngahape Stm., × 2½. Fig. 13.—Notocallista (Fossacallista) opima n.sp., paratype. × 3. Figs. 14, 15.—Notocallista (Fossacallista) opima n.sp., holotype, × 2. Figs. 16–18.—Notocallista (Fossacallista) eburnea (Tate), topotypes, × 2.
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Figs. 1–3.—Notocallista (Fossacallista) tatei (Cossmann). Torqua. × 1. Figs. 4, 7.—Notocallista (Fossacallista) tersa n.sp., holotype, × 1½. Figs. 5, 6.—Notocallista (Fossacallista) tecta n.sp., holotype, × 1½. Fig. 8.—Notocallista (Fossacallista) parki (Marw.), All Day Bay, × 1 3/5. Figs. 9, 10.—Notocallista (Fossacallista) parki (Marw.), holotype. × 1 3/5. Fig. 10a.—N. parki (Marw.). Confluent muscle scars of pedal retractor and anterior adductor, × 5. Figs. 11, 14.—Notocallista (Fossacallista) ancisa n.sp., holotype, × 1½. Figs. 12, 13.—Notocallista (Fossacallista) watti n.sp., holotype, × 1. Figs. 15, 16—Notocallista (Fossacallista) singletoni n.sp., holotype, × 1¼.