52 



THE .VOYAGE OF H.M..-'. CHALLENGEi;. 



J 



exhibitiue the animal from the rijj-ht side, the other as seen from alujve. The aecom- 

 panying woodcuts have been executed with the greatest possible accuracy from these 



drawings, and in the following description are also embodied 

 certain manuscript notes l)y the same author. 



Description. — The specimen has, according to the late Di; 

 V. Willemoes-Suhm. a length of 40 mm., of which the carajjace. 

 measuretl along the upper face, occupies 20 mm. 



The form of the l)ody, as will Ite seen from the figures, is 

 comparatively short and thickset, even m(n'e so than in the 

 species of the genus Gnathoj^hcmsia. 



Tlie carapace is enormously develo^ied, c-overing not onh' 

 the whole of the trunk, but also a very consideraljle part <:)f 

 the tail, of which the two anterior segments are completely 

 concealed beneath it. It is very thin, membranous, and semi- 

 transparent, and does not exhibit ;iny trace of keels or other 

 sculpturing, nor jut out distinctly into spines. Tliroughout 

 by fiir the greater part of its extent, it loosely covers the 

 body like a mantle, being connate with it in its most anterior 

 part "jnly. Posteriorly, it is deeply emarginate, the lateral 

 parts forming broadly rounded and very deep wing-like 

 expansions, overlapping the third caudal segment, ;nid more 

 or less completely concealing at tlie sides the three an- 

 terior pairs of caudal limbs, as also the basal parts of tlie 

 legs. Anteriorly, it projects as a short, but very broad, frontal plate, abruptly 

 truncate at the extremity, the anterior margin lieing slightly emarginate and finely 

 serrate, the lateral corners somewhat extended. At a short distance behind the 

 frontal plate a distinctly marked transverse suture occurs, apparently corresponding 

 to the cervical sulcus in other Schizopods. The antero-lateral corners of the carapace 

 form an acute angle. No supra-orl>ital. aiitenual, nor brancliiostegal spines can he 

 detected. 



The caudal segments appear somewhat compressed, and exhibit a slight transverse 

 impression close to the posterior margin. The epimera are evenly rounded, as in 

 Lophogaster. The last segment would not seem to l)e subdix-ided transversely, and ir 

 has a small epimeral spine on either side. 



The eyes axe very small and narrow, with the cornea Imt slightly expan<led ; they 

 l)roiect a little on either side of the frontal plate. 



The antennular peduncle is short and thick, the basal joint Ijeing wholly concealed 

 beneath the frontal plate, whereas the two outer joints project beyond its anterior margin. 

 As in (Hiuithophansia, the last joint juts out on the inner side as a densely setigerous 



Fu;. 2.—Chularii.''2ns alala, Suhni. 



