Indian Deep-fsea Dredging. 265 



in Myra and //?V/, are dorsally carinate. The supra-orbital 

 margin is marked by two fissures; the infra-orbital is a stoutish 

 triangular tooth, separated externally from the supra-orbital 

 by an angular notch, internally by a wide hiatus from the 

 front, and inferiorly from the notched upper edge of the 

 afferent branchial opening by a considerable space. The 

 structure of the orbit is in fact to all intents and purposes 

 identical with that of Ilia, the only difference being that the 

 extra-orbital notch forms a third fissure in the latter, whereas 

 in Myra the notched edge of the afferent branchial opening 

 forms, or comes into such close relation with the orbit that 

 it seems to form, the lower margin of the latter, and that 

 which answers to the lower orbital rim of Parilia is an 

 extra- orbital lobe separated from the supra-orbital margin by a 

 third and from the functional infra orbital margin by a fourth 

 fissure. 



The little lobe which in Myra bounds the outer notch of 

 the u])per margin of the afferent branchial aperture and does 

 not extend beyond the level of the extra-orbital lobe, is in 

 Parilia laterally expanded to a iiuge extent on each side, so 

 as to form the enormously wide orifices of the aff'ei-ent bran- 

 chial channels, and thus to treble the apparent width of the 

 front. The exognaths of the external maxillipeds are com- 

 mensurately and concomitantly widened, and are segments of 

 a circle larger than a semicircle, thus exceeding in width the 

 stmie parts even in PJiilyra] they are truncate at the extre- 

 mity, and when closed leave a wide chink-like opening 

 between themselves and the sides of the carapace. 



The chelipeds are long, slender, and cylindrical, being 

 about twice as long as the carapace in adult females and 

 males of the same size, but no less than 4^ times as long as 

 the carapace in giant specimens of tiie latter sex ; they are 

 finely and sharply granulated, especially on the upper surface, 

 from the base to the insertion of the dactylopodite, whence 

 they are smooth ; the meropodites are about equal to the 

 carpopodite with propodite up to the insertion of the dactylo- 

 podite, which is scarcely more than half the length of the 

 projjodite without its prolongation in females and in males of 

 the sr.me moderate size ; the propodite increases slightly in 

 vertical width to the insertion of the dactylopodite. I'he legs 

 are of moderate length and strength and are almost smooth ; 

 their meiopodite is almost equal to the propodite and dactylo- 

 podite together ; the dactylopodites, which are strongly 

 fringed on the upper and lower edges, arc so twisted and 

 curved that their smooth and transversely convex sides are 

 directed forwards and upwards, and backwards and downwards 



