EEPOET ON THE CUMACEA, 55 



Station 47, May 7, 1873 ; lat. 41° 14' N. long., 65° 45' AV.; depth, 1340 fathoms; 

 bottom, blue mud. 



The species has also been taken during the Norwegian North Atlantic Expedition 

 in different places in the cold area. 



10. Diastylis horrida, n. sp. (PL IX. figs. 1-8) 



Specific Characters. — $ . Carapace not twice as long as the exposed part of 

 trunk, slightly depressed ; surface somewhat irregularly grooved and armed all over 

 with numerous spines, some of which are much larger than the others ; pseudorostral 

 projection acute, a little longer than frontal lobe; inferior edges of carapace denticulate 

 in their whole length. No distinct eye. Free segments of trunk with transverse rows 

 of small spines ; epimera strongly denticulate at the edges. Tail more or less densely 

 spinulous. Antennulas with basal joint of peduncle armed at the tip with two strong 

 spines, the smooth setae afiixed to its outer corner remarkably long. First pair of legs 

 exceeding in length the carapace, terminal joiut very slender and much longer than the 

 preceding ; second pair with basal joint strongly spinous, antepenultimate joint equalling 

 in length the two last taken together ; remaining legs rather slender, with basal joint 

 more or less densely spinous. Telson of moderate length, terminal jiart scarcely longer 

 than basal and densely denticulate at the edges ; apical spines much larger than laterals. 

 Uropoda not very slender, branches unequal, inner shorter than outer, and composed of 

 but two joints. Length, 11 mm. 



Remarhs. — The present species is easily known by the body being armed all over with 

 unequal spines, more densely crowded together on the carapace ; by the great length of 

 the terminal joint of the first pair of legs, and finally by the structure of the caudal 

 appendages. In general appearance it would seem to be most nearly related to the 

 northern form, Diastylis lucifera (Kroyer). 



Description. — Most of the specimens of this form contained in the collection are 

 still immature, but there are one or two female specimens which seem to be nearly 

 fuU-groMTi, since the marsupial pouch has been formed. The larger of these specimens 

 measures about 11 mm. in length. 



The form of the body (see PI. IX. figs. 1, 2) is rather stout, nearly as in the 

 northern form, Diastylis lucifera, to which species it would seem to bear a rather close 

 aflinity. The anterior division of the body is oblongo-ovate, and of about the same 

 length as the posterior, with the dorsal surface rather evenly vaulted. 



The carapace is comparatively smaller than in the preceding species, not nearly 

 attaining twice the length of the exposed part of the trunk. It is somewhat depressed, 

 the height not nearly equalling the breadth, and, as seen from the side (fig. [l), 



