CRUSTACEA MALACOSTRACA. III. 



155 



102. Paramunnopsis oceanica Tattersall. 

 (PI. XIII, figs. 11 a— 11 i; PI. XIV, figs. 1 a— 1 b). 



[1905. Munnopsis oceanica Tattersall, Isopoda, p. 23 and 72; PI. V, figs. 1 — 7. 

 191 1. Tattersall, Die nordischen Isopoden, in Nordisches Plankton, VI, p. 187, with 



figures. 

 1914. Vanhoffen, Deutsche Siidpolar-Exp. 1901 — 1903. Vol. XV, Zoo!. VII, p. 581, 



figs. 11 a — b (? and 11 c — d). 



Description. Body of a female with marsnpinm about three times, of the males (fig. 1 a) 

 three and half times as long as broad, without processes or teeth on the dorsal surface or on the lateral 

 margins of thorax and abdomen. — Antennal peduncles nearly twice as long as the body. — Molar 

 process on left mandible (figs. 11 c and 11 e) slender, tapering from the base to the acute end, with 

 five or six oblong acute teeth on the distal half of the posterior margin. -- Maxillipeds (fig. 11 f) with 

 fourth and fifth joints conspicuously broader than second joint, which tapers towards the base; sixth 

 joint produced in a lobe, which is much longer than broad and much longer than the joint; distal 

 part of the epipod somewhat produced, but the narrow end obtuse. 



Fifth joint of the natatory legs (Tattersall: Isopoda, fig. 6) twice or a little less than twice as 

 long as broad. — Abdomen large, about as long as the sum of the three posterior thoracic segments, 

 oblong-ovate. The median lamella of the male operculum (fig. 11 g) about three times as long as broad; 

 the inner pair of terminal lobes (fig. 11 h) much longer but much narrower than the outer pair. Se- 

 cond pair of pleopods described in the diagnosis of the genus. — Female operculum (PI. XIV, fig. 1 b) 

 conspicuously broader than long, much shorter than the abdomen, somewhat convex but not carinate, 

 and posteriorly emarginate at the middle. — Uropods in the female as long as, in the male somewhat 

 shorter than, the abdomen (fig. 1 a), and second joint nearly two and a half times as. long as the first. 



Length of a male 6 mm. (Tattersall recorded 7 mm.), of a female with marsupium 5 mm., of a 

 female without marsupium 6 mm. 



Remarks. In this description the differences between P. oceanica and the two other less well- 

 known species are indirectly taken into account. The first thoracic leg was figured by Tattersall. 



Occurrence. Taken by the "Ingolf" at a station in the warm area. 



Davis Strait: Stat. 36: Lat. 6i°5o' N., Dong. 56°2i' W., 1435 fath., temp. 1-5°; 1 spec, (mutilated c?). 



Besides, it has been taken by the "Thor" in young-fish trawl far south of Iceland, at Lat. 6i°3o' 

 N., Long. i7°o8' W., 1800 m. wire out, 3 spec. 



Distribution. Tattersall recorded it as taken twice west of Ireland, respectively in townet 

 from 730 to o fath. and in young-fish trawl, 1150 fath. Vanhoffen recorded it from the South Atlantic, 

 Lat. 35°io' S., Long. 2°33' E., vertical net from 3000 m. to surface. A badly preserved specimen from 

 the Sub-Antarctic Ocean: Lat. 6i°58' S., Long. 95V E., vertical net from 2000 m. to surface, referred by 

 Vanhoffen to this species seems to me a little less certain, as he described and figured the molar 

 process of its mandibles as being somewhat different from the usual shape. 



