a correct usage of d'Orbigny's name, which, however, did not appear till 1839, and I incline to agree with Galloway (Manual, p. 240; 1933) in merging it with the earlier Planularia. Planularia whangaia n.sp. (Plate 26, figs. 63–65.) New Zealand representative of the American Navarro simondsi Carsey, but differing considerably in shape, tapering much less posteriorly; chambers much more numerous and very narrow, suture lines more raised above surface than transverse ribbing, which is very fine, dense and regular, with no sign of the basal stronger costae of simondsi or peripheral tricarination. There is considerably more resemblance to a form from the Californian Moreno Shale, figured as cf. simondsi by Cushman and Campbell (CCL, 11, 3, pl. 11, fig. 7), but an actual specimen shows different outline and striation. Size, 1.2 mm. Type from 5665, Mid-Waipara, Upper Piripauan; also from East Grey (5329), Dannevirke area (5301), Hawke's Bay (Te Uri section), and Poverty Bay (3249, 3250A). Typical of Whangai, but probably extends lower. Planularia rakauroana n.sp. (Plate 26, figs. 66, 67.) Similar in general style to whangaia, but sheath-shaped; larger and much more elongate, with subparallel sides over most of shell, which is thickened medially and has convex instead of flat surface; sutures thicker, wider than chambers instead of narrower as in whangaia. In general details very similar to suturalis Cush., 1937 (CCL, 13, 4, p. 102, pl. 15, figs. 5–7) of Upper Taylor; costae similarly developed only on sutures, but even more parallel sides and narrower, more numerous chambers. Size (restored), 2.3 mm. Type from 3250A, mid-Rakauroa. Also from equivalent Waipara greensands (5666) and Lower Rakauroa of Poverty Bay (3242, 3249, 3270). Marginulinopsis marshalli n.sp. (Plate 26, figs. 47, 48.) Initial coiled part obscure, of about 4 lightly convex chambers with linear sutures hardly raised; about 6 later chambers separated by heavily limbate sutures much thicker on medial half of surface; no other ornament; all sides except terminal face sharp with narrow flange all round hardly interrupted by coiled portion. Size, 1.2 mm. Type from 5540. Index of Lower Bortonian. Replaced by noduled forms in higher beds (hochstetteri) and in still lower beds (waiparaensis). Present in part of Poverty Bay Te Hua beds (4005, Waitangi Stream), and in East Grey Stream (5328, mudstone under Upper Bortonian sands below Amuri limestone). Marginulinopsis waiparaensis n.sp. (Plate 26, figs. 45, 46.) Similar to marshalli in size and convexity, but with nodular sculpture; coil more prominent and projecting, heavily ribbed in megalo form; chambers up to 9, with narrower sutural ridges, not thickened medially, broken up into 6–7 nodules, a second carina on each side of peripheral one, the narrow flanges irregularly serrate. Size, 1.8 mm. Type from 5672, lower part of sandy marl below Amuri chalk marl, mid-Waipara; index of lowest Bortonian, replaced in upper part of same sandy marl (5673, 5675) by marshalli, and in uppermost