192 Bulletin Vanderhilt Marine Museum, Vol. Y 



are deep. The superior orbital margin is widely sinuate but not oblique ; 

 the inferior orbital margin is curved, with a distinct excavation near 

 the middle of the lower border and a deeper gape at the outer angle ; a 

 small toothlike tubercle occurs above the inner angle. The anterolat- 

 eral angle is acute, forward directed and identical with the external 

 orbital angles. The lateral borders of the carapace are subparallel and 

 the dorsal line of the posterior portion of the border is but little con- 

 vergent; the postlateral margin is relatively straight in the median 

 part, curving above the fifth leg on each side ; the dorsal surface of the 

 carapace is very convex from front to back, finely granulose, with the 

 anterior margin lightly carinate ; the regions scarcely defined ; except 

 for the H-like depression of the urogastrie region. The sidewalls are 

 high, the pterygostomian region moderately rounded. The male belt 

 is seven-segmented, with the lateral margins slightly bowed, conver- 

 gent distally. The sixth segment is the longest of the series; the sev- 

 enth segment is abruptly smaller and narrower, forming a little tri- 

 angle with the apex bluntly rounded. 



The external maxillipeds are about as wide as high with the lateral 

 margins convergent distally but not curved outwardly. 



The eyes are quite large, the stalk short basally and only visible as 

 a very narrow sinuate line on the dorsal surface terminating in a 

 blunt, rounded spot at the apex ; no true stylet is present. The cornea 

 is black, convex, with excellent visual range in all directions. 



The antennulae have the basal article greatly enlarged, oval in con- 

 tour and convex externally, situated one on either side of the rostrum 

 above the outer portion of the epistome and touching the inner margin 

 of the orbital sinus; the remaining articles are greatly reduced and 

 usually concealed. 



The antennae are greatly reduced, situated in the small space be- 

 tween the inferior orbital angle and the epistome, with the basal article 

 bent, the second and third articles stout, cylindrical ; the flagellum is 

 short, only one and one-half times as long as the second article and not 

 acute, reaching to the base of the cornea. 



The chelipeds are distinctly unequal, the merus being trigonal, very 

 compressed, with its outer and inferior lateral margins angulate ; the 

 carpus is rounded dorsally, with a sharp tooth at the inner distal 

 angle of the propodus has the palm almost as high as long, rather com- 

 pressed but with the upper outer portion decidedly rounded, the lower 

 outer portion moderately inflated, both the inferior margin and outer 

 surface of the palm covered with squamose granules. The lower finger 



