CRUSTACEA MALACOSTRACA. II. 2 I 



as the two preceding segments combined, somewhat narrower than fifth segment, and posteriorly 

 emarginate. — Uropods (figs. 2 a and 2 h) slightly shorter than the abdomen; peduncle abont two and 

 a half times as long as broad; endopod very long with thirteen joints, the first joint conspicuously 

 thicker than the second and third and as long as these two combined; exopod very small, two-jointed, 

 with the proximal joint shorter than the distal. 



Length 20 mm . 



Remarks. Though new species of this family as a rule ought not to be founded on adult 

 males, I venture to establish a new species on the specimen described, because it is not only charac- 

 teristic but very much larger than any specimen of Tanaida? hitherto captured. The animal when 

 hauled up from the sea was quite white. 



Occurrence. The "Ingolf" has taken this species at a single station. 



Davis Strait: St. 36: Lat. 6i°5o'N., Long. 56°2i'W., 1435 fm., temp, r.5 ; 1 spec. 



Heterotanais G. o. s. 



Of this genus nine species have been established. The material at hand contains only a single 

 probably new species. 



12. Heterotanais groenlandicus n. sp. 



(PI. I, figs. 5a— 5 g.) 



1887. Heterotanais limicola H. J. Hansen, Vidensk. Medd. Naturh. Forening i Kobenhavn for 1887, 



p. 178 (Probably not H. (Paratanais) limicola Harger). 



Female. The body (fig. 5a) about six times as long as broad. — Carapace only a little 

 longer than the two anterior thoracic segments combined, a little longer than broad, anteriorly not 

 fully half as broad as somewhat before the posterior margin (fig. 5 b). 



The eye-lobes are considerably produced, distally not angular but rounded (fig. 5 c); the eyes 

 are moderately large, black, but the black pigment renders it impossible to count the ocelli, a couple 

 of which are seen at the hind margin of the black spot. The antennula; (figs. 5 a and 5 c) are a 



little shorter than the carapace, somewhat slender; first joint somewhat longer than the two others 

 combined, almost four times as long as deep; third joint about twice as long as the second. - An- 

 tenna; somewhat slender; fourth joint (formed by fusion of fourth and fifth joints) only as long as the 

 two preceding joints combined. 



The chelipeds (fig. 5 c) are somewhat robust; the carpus is almost twice as long as deep. The 

 chela is somewhat longer than the carpus and somewhat more than twice as long as broad; the 

 movable finger is much shorter than the hand; the fixed finger (fig. 3d) is somewhat expanded on 

 the incisive side with about three low protuberances and near the end rather broad and distally rect- 

 angular, while the very short apical part of the finger is slender and marked off from the inner 

 expansion. 



Second pair of legs (fig. 5 c) with a very long seta from the upper distal angle of fifth joint; 

 sixth joint about as long as fifth and fourth joints combined and a little shorter than seventh joint 

 with claw; seventh joint a little shorter than the claw. Third pair of legs (fig. 5 e) have the seventh 



