REPORT ON THE SCHIZOPODA. 185 



Description. — Only one specimen, a broken adult female, is com23rised in the collec- 

 tion. It has a length of 24 mm., and is thus somewhat smaller than the last species. 



The form of the body (see PI. XXXIII. fig. 7) would appear to be a trifle more 

 slender than in the last species, and the tail is in particular relatively more elongate, as 

 compared with the anterior division. 



The carapace is rather large, and exhibits the usual form, with the cervical sulcus 

 very strongly marked, and the posterior edge evenly emarginate in the middle, exposing 

 above a small portion of the last segment of the trunk. The frontal margin (see fig. 8) 

 is evenly arched at the sides, and exhibits in the middle a small pointed projection, the 

 rudiment of a rostrum. 



The tail tapers somewhat backwards, and has the last segment very elongate, 

 exceeding in length the two preceding segments taken together. 



The eyes (see fig. 8) are comparatively small, and exhibit a form somewhat differing 

 from that in the other sj)ecies, being narrowly clavate, or almost fusiform, with the 

 cornea not iu the least expanded, and occup}dng but a very small part of the eye. The 

 ocular pigment is, as in the last species, of a reddish colour. 



The antennular peduncle {ibid.) is somewhat more slender than in Boreomysis 

 obtusata, though in other respects exhibiting the usual structure. 



The antennal scale {ibid.) is less produced than in the two preceding species, 

 projecting, as it does, beyond the antennular peduncle by only one-fourth of its length. 

 It has an oblong-linear foi'm, with the greatest breadth about in the middle, and the 

 apex obtusely rounded, with the denticle of the outer corner very small. 



The legs would seem to agree in structure perfectly with those in Boreomysis 

 obtusata. 



The telson (fig. 9) is exceedingly slender and elongate, exceeding perceptibly in 

 length the last segment, and has the outer part much narrowed. The lateral edges are 

 in the greater part of their length armed with rather strong denticles, having between 

 them a great number of much smaller ones. The apical incision is comparatively short, 

 occupying only from one-seventh to one-eighth of the length of the telson, and rather 

 narrow, having, however, at the bottom a peculiar dilatation (see fig. 10). The edges of 

 the incision are, as usual, coarsely spinulose, and the terminal lobes rounded at the 

 tip. 



Of the uropoda the outer plates had been broken off in the specimen examined ; the 

 inner plates were very slender, lanceolate, and projected perceptibly beyond the tip ol' 

 the telson. 



Habitat. — The sole specimen described above was taken in the North Atlantic south 

 of Nova Scotia, United States : — 



Station 50, May 21, 1873; lat. 42° 8' N., long. 63° 39' W.; depth, 1250 fathoms; 

 blue mud ; bottom temperature, 38°'0. 



(zooL. CHALL. EXP. — PART xsxvn. — 1885.) Oo 24 



