REPORT ON THE SClilZUPODA. 187 



furuished of the animal viewed from above. It may at once lie distinguished from the 

 typical species, Amhlyops ahhrevlata, G. 0. Sars, by the deviating form of the antennal 

 scale and the telson, as also by the remarkably slender legs. 



Description. — Only a single specimen of this form, an adull male, was procured on 

 the Expedition. It has a length of 29 mm., and thus considerably exceeds in size the 

 typical species, which attains a length of only 18 mm. 



The form of tlic body (see PI. XXXIII. figs. 11, 12) is comparatively rather robust, 

 though somewhat less so than in the typical species, with the anterior division 1)Ut 

 slightly more dilated than the posterior. 



The carapace is rather large, covering most of the trunk, and leaving but a small part 

 of the last segment exposed above. The anterior part is marked ofi' by a well-defined 

 cervical sulcus, and somewhat arched above, with the frontal margin forming in the 

 middle a perfectly even curve. The anterodateral corners of the carapace are obtusely 

 truncate, and the inferior margins rather incurved in the middle. 



The tail is cylindrical and anteriorly only a trifie narrower than the anterior part of 

 the carapace. The five anterior segments are nearly uniform in length, whereas the last 

 is rather elongate, almost as long as the two preceding taken together. 



The ocular plates are comparatively large, occupying, as they do, tlie whole breadth 

 of the frontal margin, and are perfectly well defined from each other, though contiguous 

 along their inner edge. They exhibit an irregular quadrilateral form, with the inner side 

 shortest, and forming a right angle with the anterior, which has a short, somewhat 

 upturned, papillary projection in the middle. The edges of the plates are quite smooth, 

 and no trace of any pigment or visual elements could be detected in the specimen 

 examined ; though a similar diftuse pink pigment, as in the typical species, may have 

 existed in the specimen, when still fresh. 



The antennular peduncle is sliort and thick, with the terminal joint as large as the 

 two others taken together. The male appendage is comparatively shorter than in the 

 typical species, but furnished with a dense bunch of delicate bristles. The flagella were 

 broken off at a short distance from their bases. 



The antennal scale (fig. 13) exhibits an appearance somewhat different from that in 

 the typical species, and is also relatively somewhat shorter, attaining scarcely twice the 

 length of the antennular peduncle. It is somewhat rhomboidal in form, the apex being 

 very obliquely truncate, with the inner corner greatly projecting as a narrow linguiform 

 lobe fringed round with long setaj, whereas the outer corner juts out as a strong dentiform 

 projection, placed almost in the middle of the length of the scale. The basal part of the 

 flagellum is but half as long as the scale, with the middle joint longest ; the terminal 

 part was broken in the specimen examined. 



The legs (figs. 14, 15) are ratlier more slender than in tlie typical species, and very 

 narrow, especially the posterior ones (fig. 15), though still e.xhildtiug the structure 



