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THE .VOYAGE OF H.M.f-'. CHALLENGE!!. 



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cxliibiting the animal from the right side, the other as seen from above. The accom- 

 [lanving 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 Dr. 

 V. Willemoes-Suhm, a length of 40 mm., of which the caraj^ace, 

 measured along the upj^er face, occupies 20 mm. 



The form of the 1>ody, as will be seen from the figures, is 

 comparatively short and thickset, even more so than in the 

 species of the genus Gnathophausia. 



The carapace is enormously developed, covering not only 

 the whole of the trunk, but also a very considerable part of 

 the tail, of which the two anterior segments are comj)letely 

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

 transparent, and does nut exhibit any trace of keels or other 

 sculpturing, nor jut out distinctly into spines. Throughout 

 by for the greater part L>f its extent, it loosely covers the 

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

 part only. Posteriorly, it is deeply emarginate, the lateral 

 parts forming broadly rounded and very deep wng-like 

 expansions, overlapping the third caudal segment, and more 

 or less completely concealing at the sides the three an- 

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

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

 truncate at the extremity, the anterior margin Ijeing 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 sulciis in other Schizopods. The antero-lateral corners of the carapace 

 form an acute angle. No supra-orbital, antennal, nor branchiostegal spines can be 

 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 lie subdivided transversely, and it 

 has a small epimeral spine on either side. 



The eyes are very small and narrow, with the cornea but slightly expanded ; they 

 [troject a little on either side of the frontal plate. 



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

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

 .Vs in Giuithophaitsia, the last joint juts out on the inner side as a densely setigerous 



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Fin. 2. — Chobiru.'tpis alata, Suhm. 



