188 Bulletin Vanderhilt Marine Museum, Vol. Y 



gion, equal to about one and one-sixth times the length; the lateral 

 borders tumid. The interorbital region is equal to about two-fifths of 

 the frontal width of the carapace and is not quite straight, having a 

 sinuous carinate border that is continuous with the sinuous superior 

 orbital margin, which is very oblique, running backward to the post- 

 orbital denticle and below this, is continuous with the sinuate, carinate, 

 inferior orbital margin. The greatest width and height of the orbit is 

 equal to about one-half its long diameter. There is a rounded, coarse, 

 tooth-like process, within the orbit chamber, below the base of the stalk. 

 The anterolateral margins are defined by a carinate line that originates 

 just behind the postlateral angle and curves backward. This line van- 

 ishes with age, being very faint, or even invisible in large old speci- 

 mens. The sides of the front are oblique. The regions of the carapace 

 are less emphasized in the present species than in Cardisoma hirtipes, 

 which also inhabits the IndoPacific region. However, C. carnifex has 

 the regions indicated by unequal levels ; the metagastric and cardio-in- 

 testinal regions are defined by wrinkly grooves; also the cervical 

 groove is partially defined, separating the mesogastric and branchial 

 grooves. The areolations of the metagastric region are slightly tumid. 



The anteunulae are very small, fold obliquely, being almost entirely 

 concealed by the frontal margin. 



The antennae have the basal article wider than high, filling the or- 

 bital hiatus and touching the frontal margin. 



The eyestalk is clavate with a tapered, rounded calcareous process, 

 extending to the tip of the cornea; the cornea is elliptical, terminal, 

 f ronto-lateral in position, with the visual range thus limited. 



The buccal cavern is squarish, its length in the median line being 

 equivalent to its median width. The exopodite is very slender, tapered, 

 extending to about midway the length of the merus of the endopodite. 

 This merus is about as long as the related ischium with its inner lat- 

 eral margin thickened and rounded, its distal margin slightly sinuate ; 

 the ischial margin slightly sinuate ; the ischial margin is also rounded 

 so that there is an aperture between the opposing halves of the outer- 

 most maxillipeds. 



The male belt is triangulate with fine black bristles along its lateral 

 margins; the third article is the widest of the series and the sixth 

 article is the longest, being slightly longer than wide with the lateral 

 margins convergent, their proximal two-thirds slightly rounded; the 

 seventh article is small, only half as long as the sixth, with the lateral 

 margins convergent, the tip bluntly rounded. 



