188 Bulletin, Vanderhilt Marine Museum, Vol. II 



Color: Mr. Belanske's color plate of this species shows the upper 

 surface of the carapace to be light olivaceous, while the chelipeds 

 and legs are lilac lavender, the dactyli of the fifth legs have the lav- 

 ender deepening into blue. 



Technical description : Carapace hexagonal, transversely elongate, 

 frontal region with two pairs of teeth, besides the preorbital teeth ; of 

 these the inner pair are triangular, separated from each other by a 

 V-shaped space, and are not quite so long as the outer triangulate 

 pair, from which they are separated by a wider, unequal-sided 

 U-shaped space. The outer pair of teeth are well separated by a con- 

 cavity from the relatively obscure preorbital angle. The anterolateral 

 margin is armed with eight small, approximately subequal triangulate 

 teeth, including the postorbital tooth, well separated by wide sinuses ; 

 the lateral angle is produced into a ninth, conspicuously long, acumi- 

 nate, outpointing spine ; the postlateral margin is concave ; the pos- 

 terior margin is broad and relatively straight. The dorsal surface 

 has the urogastric and cervical grooves well defined and is micro- 

 scopically granulate. The epigastric and epibranchial lines are well 

 defined. The epistomal tooth is acute, not projecting beyond the 

 frontal margin. The inferior orbital tooth is broadly triangulate and 

 more conspicuous than the superior orbital tooth. There is one 

 straight, closed sinus midway the superior orbital border and near the 

 postorbital tooth; there is a small, acute tooth on the orbital border. 

 The male abdominal belt is T-shaped, five-segmented, the third, fourth 

 and fifth joints fused ; the penultimate segment nearly twice as long 

 as wide; the terminal segment triangulate with its distal margin 

 broadly rounded. The female belt is oval, seven-segmented ; the first 

 segment is small, nearly concealed beneath the carapace; the second 

 segment is small, transversely carinated, its lateral margins oblique; 

 the third segment is narrower, its lateral margins rounded ; the fourth 

 segment is about twice as long as the third and is abruptly wider with 

 its lateral margins rounded; the fifth segment is one and one-half 

 times as long as the preceding one and narrower, its outer margin 

 convex, converging ; the last segment is small, subtriangulate, its outer 

 margins convex. 



The eyes have the stalks short, constricted below the cornea, which 

 is spherical and is set obliquely terminal. 



The antennulae have the free joints very slender, cylindrical and 

 folding transversely beneath the frontal border. 



The antennae have a prolongation of the basal joint firmly united 



