114 CRUSTACEA MALACOSTRACA. III. 



Abdomen in the female (fig. i a) somewhat longer than broad, decreasing distinctly in breadth 

 from a little from the base to near the produced acute angles, which are somewhat small processes 

 directed mainly backwards; the posterior margin between these two teeth very convex. The male 

 abdomen (fig. i f) is larger and especially distinctly broader than in the other sex, has the postero- 

 lateral angles a little more produced, and the posterior margin between them a little less convex. 

 Uropods (fig. i e) not quite half as long as the abdomen, rather distant from one another; the basal 

 joint only a little thicker than the endopod; exopod wanting. -- Each pleopod of first pair in the male 

 operculum has its lateral margins parallel from rather near the base to the suddenly rounded end. 



Length of a female with marsupium 3-2 mm.-, of a male 27 mm. 



Remarks. D. gracilipes is allied to D. simile, but it is considerably larger; fifth joint of first 

 pair of legs has five setse, that of second pair eight setae along the lower margin, and the female 

 differs, besides, from that of D. simile in having the epimera much less produced, and the anterior 

 angles of fifth thoracic segment rounded. - In the male specimen the antennulse are 6-jointed, con- 

 sequently the flagellum 3-jointed. 



Occurrence. Taken by the "lugolf" at two deep stations in the warm area. 



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

 Stat 36: Lat 6i5o' N., Long. 562i' W., 1435 fath., temp. 1-5; i spec. 



72. Desmosoma politum n. sp. 

 (PI. X, figs. 8 a 8 e). 



Female. First thoracic segment conspicuously broader and a little longer than the second, 

 and as long as the fourth. Epimera at first segment constitute a pair of low, obtuse triangles; the 

 three following pairs have the outer margin distinctly incised near the middle, and the front half a 

 little protruding and rounded. Fifth segment a little more than half as broad again as long, with all 

 angles broadly rounded, and the lateral margins a little converging backwards. 



First pair of legs (fig. 8b) very robxist; fifth joint scarcely twice as long as deep, with four 

 moderately strong spines on the lower margin, the most distal placed on the angle and much shorter 

 than sixth joint, while a moderately short spine thus the fifth - - is placed above the longest spine 

 on the terminal margin of the joint; sixth joint a little shorter than the fifth, very oblong-oval, some- 

 what less than three times as long as deep. -- Second pair of legs (fig. 8c) moderately strong; fifth 

 joint long, between four and three and a half times as long as deep, increasing conspicuously in depth 

 from the base to beyond the middle; its lower margin and end with seven spines, the five proximal 

 of very moderate length, the sixth spine long and placed on the distal angle, while the seventh, inserted 

 above the sixth on the terminal margin, is still longer, not much shorter than sixth joint; the upper 

 margin with three strong setae. Sixth joint with three strong setae on the upper and a fine seta at 

 the middle of the lower margin. -- Seventh pair of legs (fig. 8 d) somewhat strong; fifth joint with a 

 very long seta at the lower distal angle, and before this two much shorter sette; sixth joint longer 

 and especially more robust than in the preceding forms, with two somewhat short setae on the lower 

 margin, and three setae, one among them long and stiff, on the upper margin; seventh joint unusually 

 short, terminating in a well developed claw somewhat shorter than the joint 



