REPOET ON THE SCHIZOPODA. 183 



Telson somewhat narrowed in outer part, apical incision occupying scarcely one-fifth of 

 the length of the telson, rounded at bottom ; terminal lobes narrow, obtuse at tip. 

 Length, 30 mm. 



Remarks. — This species is nearly allied to the two northern species Boreomysis 

 nobilis, G. 0. Sars, and Boreomysis tricornis, G. 0. Sars, but may at once be distinguished 

 by the obtusely rounded frontal margin, that exhibits neither a distinct rostral projec- 

 tion, nor any trace of lateral processes. 



Description. — Only two specimens — both adult males — are comprised in the collec- 

 tion, one of which is somewhat defective. The larger of the specimens measures 30 mm. 

 in length. 



The form of the body (see PI. XXXIII. fig. l) is somewhat short, nearly as in the 

 Norwegian species Boreomysis tricornis, the tail only slightly exceeding in length the 

 anterior division of the body. 



The carapace is rather large, covering, as in the preceding species, the whole of the 

 trunk, saving a very small part of the last segment that appears exposed above within 

 the bottom of the posterior emargination. The anterior part, in front of the cervical 

 sulcus, is evenly arched above, without any dorsal keel, and the frontal margin forms an 

 almost even curve, without any distinct rostral projection, presenting but a very slight 

 and inconspicuous angular prominence in the middle (see figs. 2, 3). The antero-lateral 

 lobes are rather produced and sharply pointed at the tip. 



The caudal segments are cylindrical, and, as usual in the males, rather thick and 

 muscular, the last somewhat elongate, about as long as the two preceding taken together. 



The eyes (see figs. 1, 2) are perfectly normal in structure, and rather short and thick, 

 almost circular, and somewhat flattened, with the cornea greatly expanded and provided 

 with a dark reddish pigment and well-developed visual elements. 



The antennular peduncle (ibid.) is rather stout and somewhat similar to that in the 

 typical species, the second joint being extremely short, almost discoidal. At the 

 extremity of the peduncle, beneath the insertion of the flagella, is seen the male appendage, 

 which is very short, tuberculiform, but furnished with a dense tuft of delicate sensory hairs. 



The antenna! scale (fig. 4) projects considerably beyond the antennular peduncle, 

 without, however, attaining double its length. It is oblong-linear in form, tapering 

 toward the apex, which is narrowly truncate, with the denticle of the outer corner but 

 slightly projecting. 



The legs are rather slender, and have all the propodal joints subdivided into three 

 distinctly defined articulations (see fig. 5), the first of which is much the largest, and 

 provided at the inner edge with several bunches of slender seta3. The exopods arc, as 

 usual in the males, very jJowerfuUy developed, -having the basal part broad and com- 

 pressed; they do not by any means, however, attain such a remarkable length as in the 

 preceding species. 



