272 



In the largest male the length of the fully extended body is 42 millim., of 

 the chelipeds 30 millim. 



Andaman Sea, 480 fathoms. 



Regd. Nos. — : -y- (Type of the species). 



42. Munidopsis (Elasmonotus) cylindrophthalmus, Ale. 



Elasmonotus cylindro-phthalmus, Aloock, Ann. Mag. Nat. Hist., April 1891, p. 333. 

 Illustrations of the Zoology of the Investigator, Crustacea, Plate XIII. Fig. 4. 



The carapace is quadrangular, with the antero-lateral angles simply rounded 

 and the surface and borders quite unarmed, the lateral borders being quite 

 parallel. 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 subcristiform lateral margins 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 pleura 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 eyestalks, which are slender and extremely short, are free and freely 

 movable ; the corneaa are remakably long and cylindrical, their length being 

 from nearly half to 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, with the exception of 

 the spiniform antero-external angles of the 2nd and 3rd joints of the antennal 

 peduncles. 



The antennal peduncles are long and slender, the antero-external angle of 

 each of the second to fourth joints forming a tooth. 



The external maxillipeds are long and 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 pubescent. The chelipeds 

 are long — one half longer than the body and more than three times as long as the 

 other legs in the female, more than twice as long as the fully extended body 

 in the male — slender, and cylindrical ; the fingers, which are not two-thirds the 

 length of the palm, are singular in being rather hairy. 



The second to fourth thoracic legs are slender and extremely short, being 

 not quite as long as the carapace (with the rostrum) ; they all have the meropo- 

 dite carinated along the anterior border and the dactylopodite (which has the 

 usual spiny posterior border) short. 



