38 



CRUSTACEA MALACOSTRACA. II. 



South of Jan Mayen: St. 113: Lat. 69°3i' N., L,ong. 7°o6' W., 1309 fm., temp. -f-i.o°; 7 spec. 

 Distribution. A single ovigerous female has been found between some material from the 

 Kara Sea brought home by the "Dijmphna" Expedition. 



22. Typhlotanais macrocephala n. sp. 

 (PI. Ill, figs. 6a— 6 e.) 



Specimen without marsupium. Body almost five and a half times as long as broad. — 

 Carapace (fig. 6a) exceedingly large, nearly longer than second, third and half of fourth segment com- 

 bined, considerably longer than broad; the anterior margin only a little shorter than the posterior, 

 with the frontal process constituting a broad, rather low triangle with the margins along the base of 

 the antennulse very feebly concave; the carapace is broadest at the end of the anterior two-thirds, 

 and the major part of its lateral margins are somewhat convex and posteriorly with a few saw-teeth 

 or fine indentations. 



The antennulse (fig. 6 b) are short and thick, conical, only half as long as the carapace. First 

 joint about half as long again as deep; the two distal joints combined about as long as the depth of 

 the first joint; second joint much deeper than long; third joint proportionately thick at the base, conical, 

 with the terminal setae about as long as the first joint. — Antennae short and moderately thick; third 

 joint not thickened, fourth considerably less than twice as long as the penultimate joint; terminal 

 setae nearly as long as those of the antennulse. 



Chelipeds somewhat small (fig. 6b). Posterior protuberance on the basal joint short; the dis- 

 tance between its hind margin and the anterior lower angle and second thoracic segment considerably 

 longer than the basal joint. Carpus considerably longer than the basal joint, about twice as long as 

 deep. Chela a little longer than the carpus, only about two and a half times as long as broad; 

 movable finger distinctly longer than the front margin of the hand; fixed finger thick at the base, 

 with a tooth before the end. 



Thoracic segments (fig. 6 a) somewhat similar in general shape and relative dimensions to those 

 of T. irregularis, but the major posterior part of the lateral margins of second to fourth segment with 

 four or five distinct teeth (fig. 6 c). Second segment slightly narrower than the carapace, not fully 

 twice as broad as long, broadest at the angle a little behind the anterior margin and decreasing much 

 in breadth posteriorly; seen from the side (fig. 6b) this segment is expanded downwards below and 

 the expansion produced in an enormous process, the base of which is as long as the segment, while 

 the posterior margin is regularly convex, the anterior margin deeply concave and the end of the pro- 

 cess acute and directed somewhat forwards. Third segment scarcely longer and considerably nar- 

 rower than the second but otherwise nearly of the same shape (fig. 6a); fourth segment about as long 

 as the third but distinctly narrower and of similar shape. Fifth and sixth segments each scarcely as 

 broad as the fourth and only a little more than half as broad as the carapace, while seventh segment 

 is as broad as the fourth; the lateral margins of all three segments are considerably convex and more 

 or less distinctly angular; fifth segment broadest a little behind the middle and the two other seg- 

 ments broadest somewhat behind the middle; the fifth segment has a few nearly rudimentary teeth 



