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Description of Male
Length, 4½ mm.; depth, 1 mm.; width, 1¼ mm. Colour in formalin, white. General appearance like Hyperia bengalensis, taken at the same station, but somewhat more solid and squarish.
Antennae. First: Of more than 20 segments; length 5 mm. Second: Angles of 1st and 2nd flagellar segments not produced as in Hyperia bengalensis; flagellum of more than 19 segments; length 6¼ mm.; otherwise antenna like H. bengalensis. Other appendages also like H. bengalensis except as below.
Mouthparts. First Maxillae: Inner plate a blunt lobe with circlet of slender setae, part of the circlet forming a fringe distally along inner margin. Outer large lamellar plate extending well past inner plate, ovate, inner surface and margin with a few setae, outer margin and surface distally very minutely toothed. Mandible: Cutting edge a narrow chisel-shaped plate with fimbriated end margin: margin at base and extending to molar process finely bristled and fimbriated also; a setose triangular process alongside cutting edge, below these a small palp-like well-bristled process corresponding to molar process. Palp long, slender, of 3 segments, 2nd about ⅔ length 3rd, outer margin of 3rd finely bristled. Maxilliped: A median narrow blunt and finely setose process extends not quite ½ along outer
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Text-fig. 7.—Hyperoche medusarum (Kroyer). Female. 110—Peraeopod 1.111—Peraeopod 1 carpus. 112—Peraeopod 2, end segments. 113—Epimeral plates. 114—Uropods and telson. Hyperoche mediterranea Senna. Male. 115—Maxilla 1. 116—Maxilla 2. 117—Mandible. 118—Maxilliped. 119—Gnathopod 1. 120—Gnathopod 2. 121—Peraeopod 1. 122—Peraeopod 2. 123—Peraeopod 3. 124—Uropods and telson.
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lanceolate plates, which have finely bristled outer margin and surface; inner margin slightly serrate with several fine setae; apices acute.
Gnathopods. First: Basos width ⅓ length. Ischium subrectangular, ¼ basos length; posterior margin and surface finely bristled. Merus anterior margin small, posterior ½ basos length, produced distally in sharp knife-like triangular process ⅔ along carpus to propod. Carpus anterior margin about ⅖ basos length, twice width; posterior margin produced in sharp knife-like process a little past end of propod so posterior margin about ⅔ basos length; propod narrowing distally to dactylos, as long as carpus anterior margin. Dactylos slender, about ⅓ propod. Merus, carpus and propod margins and surface all finely bristled; short bristles on propod posterior surface grade imperceptibly into short strong teeth along margin; to lesser extent distal margins of other segments are similarly toothed. Second: Gill ovate, large much longer than basos. Otherwise like Gn. 1.
Peraeopods. First: Gill ovate, simple, much longer than basos. Basos width ⅓ length; posterior margin finely bristled distally. Ischium subrectangular, ⅓ basos length, posterior surface and margin finely bristled. Merus less than ½ basos length width ½ length. Carpus subrectangular, slightly longer than merus, width ⅖ length, sharp posterodistal angle almost right-angled. Propod ⅔ basos, width ⅙ length, posterior margin finely toothed like carpus posterodistal angle. Dactylos slender, ⅓ propod length. Merus, carpus and dactylos surface and margins finely bristled as in gnathopods Third: Basos width ⅖ length. Ischium subrectangular, posterior margin ⅖ basos length. Merus ⅔ basos, posterior margin widening convexly distally, distal width ½ length. Carpus narrower, as long as merus. Propod as long as basos, width ⅕ length. Dactylos slender, ½ propod length. Ischium to propod segments all finely bristled along posterior margin and surface (this bristling not figured). Fourth and Fifth: Like third.
Epimeral Plates. Somewhat distorted in specimen but showing no sign of sharp point to posterodistal angle, broadly rounded instead.
Uropods. Biramous, rami lanceolate. Inner margin of each ramus and outer margin of inner ramus of each uropod finely pectinate. Rami of 1st with inner margins excavate proximally, margin about excavation finely bristled. Outer margins and surface of peduncles and outer rami finely bristled. Tips of rami of 1st and 2nd uropods reaching tips of 3rd. First: Rami subequal, ratio to peduncle length 8:11. Second: Rami as long as uropod 1 rami, ratio to peduncle 5:6. Third: Rami wider in proportion to length than in other uropods; ramipeduncle ratio approximately 2:3. Telson: Subtriangular, as wide as long, not quite reaching ½ along uropod 3 peduncle.