InrJian Deep-sea Drcfhjiurj. 333 



Tlie abdominal legs, except the first two pairs, arc rudi- 

 mentary in the male. 



Length 59 millim., measured from the tip of the rostrum. 



Colour in life brilliant white. 



Dredged at Station 118, 1803 fathoms. 



The variety differs from the tyjiical form in having only 

 two gastric spines, in having the rostrum broader, in having 

 the cardiac area more distinctly delimited, and in tlie strongly 

 fluted fifth and sixth joints of the second to fourth thoracic legs. 



Elasmonotus, a. Milne-Edwards. 

 84. Elasmonotus ci/Iindrophthalmus, sp. n. 



Nearest to EJasmonotiis longimamis, A. M.-Edw., and to 

 Elasmonotus carinipes^ Faxon. 



The carapace is quadrangular, with the antero-lateral 

 angles simj^ly rounded and the surface and borders perfectly 

 smooth, the greatest breadth being about three fourths of its 

 length. The rostrum is triangular, flat, and horizontal, with 

 the extreme tip slightly upturned ; the frontal margin, which 

 is faintly lobed on either side of the rostrum, meets the lateral 

 margins, which are almost parallel, at right angles; the 

 raised posterior margin is smooth ; two deep grooves, one of 

 which crosses the cardiac region, pass across the carapace 

 transversely. 



The abdominal terga and plcurte are perfectly smooth ; the 

 terga, from the second to the fourth, are transversely grooved, 

 the edges of the groove being salient but smooth ; in the case 

 of the fourth tergum the posterior edge of the groove forms 

 a strongly convex eminence. 



The eye-stalks, which are slender and extremely short, are 

 free and freely movable ; the cornese are remai-kably long and 

 cylindrical, their length being about two thirds that of the 

 rostrum. 



The basal joint of the antennulary peduncles has two 

 external terminal spines, these being the only spines found 

 upon the animal. 



The antennal peduncles are long and slender, the antero- 

 exterual angle of each of the second to fourth joints forming 

 a tooth. 



The external maxillipeds are long aud slender, the ischium 

 having the inner edge finely toothed, and the meropodite 

 having two small tubercles on its lower edge near the 

 proximal end. 



The thoracic legs are perfectly smooth and hardly pubes- 



