CRUSTACEA MALACOSTRACA. III. 113 



side of the joint has about five long setse placed in a row below the upper margin; sixth joint has 

 three long setse on the distal half of the upper margin, and on the lower margin a small seta at the 

 middle and a couple at the end. — Seventh pair of legs (fig. 7 d) long and very slender; fifth joint 

 with only three setse, two of which very long, on the distal part of the lower margin; sixth joint with 

 four setse on the lower margin, and at least two of them very long. 



Abdomen (fig. 7 a) slightly longer than broad, but otherwise somewhat resembling that in 

 D. loiigispiintm, excepting that the posterior margin between the postero-lateral acute processes is some- 

 what more convex than in the female of that species. — Uropods half as long as the abdomen, and 

 inserted moderately far from one another (fig. 7 e); the peduncle only somewhat thicker than the endopod; 

 exopod wanting. 



Length of an ovigerous female 2'2 mm. 



Remarks. The female of this species (the male is unknown) is separated from D. longispinwn 

 in having especially the two anterior pairs of epimeral processes much shorter, the anterior angles of 

 fifth segment produced into processes, setse above on the outer side of fifth joint of second pair of 

 legs, the uropods much removed from the median line, and their peduncles of normal size. The dif- 

 ferences between D. simile and D. gracilipcs are pointed out in the "remarks" on the last-named species. 



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



Davis Strait: Stat. 24: Lat. 63°o6' N., Long. 56°oo' W., 1199 fath., temp. 2-4°; 5 spec. 



71. Desmosoma gracilipes n. sp. 

 (PL XI, figs. 1 a— if). 



Female and Male. First thoracic segment slightly longer than the second, which is about 

 as long as the third or the fourth. In the female (fig. 1 a) the epimera at first segment are anteriorly 

 produced into a subtriangular process, about as long as broad and terminate in a minute spine; the 

 epimera at the three following segments are similarly shaped, but from first to fourth pair gradually 

 a little shorter. In the male (fig. t f) the epimera are anteriorly produced in processes more than twice 

 as long as in the female, and even longer than in the female of D. simile; each process terminates in 

 a small spine. Fifth segment in the female more than half as broad again as long, with all angles 

 rounded, and the lateral margins subparallel, though slightly concave; in the male (fig. if) this seg- 

 ment is half as broad again as long, and differs especially from that in the female in having the 

 anterior angles acute and a little produced outwards. 



First pair of legs (fig. 1 b) rather slender; fifth joint somewhat more than three times as long 

 as deep, with five very strong setse along the lower margin, the two distal of these setse placed close 

 together at the angle and only somewhat shorter than sixth joint. — Second pair (fig. 1 c) moderately 

 slender; fifth joint about three and a half times as long as deep and somewhat increasing in breadth 

 from base to the end, its lower margin with eight strong setse, the two most distal even very robust 

 and somewhat longer than sixth joint, and, besides, a row with eight setse is seen on the outer side 

 of the joint below the upper margin; sixth joint has seven setae on the upper and three on the lower 

 margin. — Seventh pair (fig. id) slender; fifth joint with four long setae and one shorter seta on the 

 lower margin; sixth joint very slender, with about six seUe on the lower margin. 



The Ingolf-Expedition. III. ;. : 5 



