66 



Antero-lateral borders shorter than the postero-lateral — a spinule at their 

 point of junction. 



Front somewhat deflexed, broad and broadly bilobed. Orbits affording 

 little or no concealment to the eyes, without fissures or sutures : there is a gap 

 between the front and the inner angle of the orbit, in which the antennary 

 flagellum is lodged. The fronto-orbital border, in the adult, is not quite | the 

 greatest breadth of the carapace. 



The antennules fold nearly transversely : the basal antenna-joint does not 

 reach the front, the flagellum is a good deal longer than the major diameter of 

 the orbit. 



The buccal cavern is a little narrowed anteriorly. The crests of the endo- 

 stome are very faint, but to make up for this the anterior edge of the buccal 

 cavern is puffed out and is very deeply excised on either side of the middle hue ; 

 the anterior margin of the foliaceous process of the first maxillipeds is also 

 excised to correspond, and so a permanent expiratory orifice is formed, which is 

 very large and prominent beyond the almost transverse anterior edge of the 

 merus of the external maxillipeds. 



The chelipeds are stout, very long and not very unequal ; the whole of the 

 arm projects beyond the edge of the carapace : the fingers are somewhat com- 

 pressed and are pointed. 



The legs are rather slender. 



The abdomen of the male consists of five pieces, the 3-5th somites being 

 rigidly united but without obliteration of sutures. 



Sphenomerides trcvpezloides, Wood-Mason. 



Sphenomerus trapexioides, Wood-Mason, Ann. Mag. Nat. Hi8t. March, 1891, p. 263 : 111. Zool. Investigator, 

 Cruat. pi. v. fig. 2 (where the carapace is drawn a little too broad; : Alcock, J. A. S. B. Vol. LXVII. pt. 2, 1898, 

 p. 228. 



Carapace about |- as long as broad, convex in all directions, smooth, 

 polished. 



The front is about | the greatest breadth of the carapace, is obliquely 

 deflexed, and is divided into two rather shallow broadly-rounded lobes the free 

 edge of which is entire. 



The supra-orbital angle is not defined, but the dentiform or spiniform angle 

 of the lower edge of the orbit can be seen from above. 



The antero-lateral margins form with the front a semicircular curve, each 

 carries three sharp spinules, namely, one at the outer angle of the orbit, one at 

 the juxiction with the postero-lateral border and one exactly intermediate between 

 the other two. 



