186 THE VOYAGE OF H.M.S. CHALLENGER. 



Genus 3. AmhIyo2)s, G. 0. Sars, 1872. 

 Ambhjops, (!. O. Sars, Monograpbi over Norges Mysider, Bd. ii. 



Genetic Characters. — Form of body comparatively thickset. Carapace large, 

 covering greater part of trunk, frontal margin evenly arched, without any trace of a 

 rostral projection. Eyes imperfectly developed, transformed into two immobile plates, 

 extending horizontally in front of the carapace and contiguous in the middle. Anten- 

 nular peduncle short and thick, with last joint largest ; male appendix well developed. 

 Antennal scale with outer edge naked, and jutting out at the end as a dentiform projec- 

 tion. Oral parts of usual structure. Gnathopoda having endopod comparatively poorly 

 developed. Legs subequal, of moderate length, propodal joint subdivided into three 

 articulations, terminal joint unguiform. Marsupial pouch composed of but two pairs of 

 distinctly developed incubatory lamellge. Sexual appendages in male short and thick, 

 with a transverse row of curved apical bristles. Caudal limbs in male natatory. Telson 

 linguiform, not incised at apex, outer part coarsely spinous at edges. Inner plate of 

 uropoda much shorter than outer. 



Remarks. — Of this genus, which is closely allied to the genus Pseudomma, G. 0. Sars, 

 a single species only, AmhIyo2}S abbreviata, G. 0. Sars, from the Norwegian coast, has 

 hitherto been recorded. Another form, evidently belonging to the same genus, has, 

 however, been taken on the Challenger Expedition in the southern hemisphere, and will 

 be described below. 



46. AmUyops crozetii, Willemoes-Suhm. MS. (PL XXXIII. figs. 11-16). 



Amblyujps crozetii, G. 0. Sars, PreliTiiinary Notices on the Challenger Scliizopoda, No. 44. 



Specific Characters. — Male : — Form of body somewhat more slender than in th(> 

 typical species. Carapace almost entirely covering trunk, antero-lateral corners obtusely 

 truncate. Last caudal segment somewhat longer than preceding. Ocular plates rather 

 large, quadrilateral, with a small upturned papillary projection anteriorly. Antennal 

 scale scarcely twice the length of antennular peduncle, somewhat rhomboidal, denticle of 

 outer corner placed well-nigh in tlie middle of the length of the scale, inner corner 

 projecting as a narrow linguiform lobe. Legs rather slender, terminal part very narrow, 

 with first joint longer than both the others taken together. Telson relatively short, 

 scarcely as long as last segment ; apex broadly truncate, and armed with numerous strong 

 spines. Inner plate of uropoda projecting considerably beyond tip of telson, and about 

 half as long as outer; auditory apparatus imperfectly developed. Length, 29 mm. 



Remai'ks. — This form has been bi-iefly recorded by the late Dr. v. Willemoes-Suhm 

 in his manuscript notes, as a new species, under the above appelhition, and a drawing 



