118 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



Distribution : Confined to the West Indian region. 



Material examined: One specimen dredged in Limon Bay, 

 Panama, 1926. 



Technical description: Carapace robust, rostrum about as long 

 as the eye, with the tip bifid; the upper margin armed with three 

 teeth, subequally spaced ; the first one just behind the rostrum ; the 

 third tooth slightly in advance of the orbital angle ; the second tooth 

 midway between these two. There is a well developed dorsal gastric 

 spine, and about halfway the distance between this and the posterior 

 margin there is a second, larger, upward-pointing spine, behind which 

 the dorsal carina extends to the posterior margin. There is a small 

 sharp hepatic spine and a bluntly triangular postorbital spine. The 

 abdomen has a median longitudinal crest, which on the first segment 

 terminates in a forward-directed triangular tooth. The second, third 

 and fourth segments each terminate in a slight point which is not 

 elevated above the carina; on the fifth segment the carina is sub- 

 distally emarginate posteriorly; on the sixth segment it terminates 

 posteriorly in an acute tooth. The first five segments have each a 

 transverse carina sculpturing a deep line, slightly differently placed 

 on each segment. The epimera are but little produced and are irregu- 

 larly rounded, those of no two segments being identical ; the fourth, 

 fifth and sixth segments each have a small tooth at the postlateral 

 angle. The caudal fan has a slender triangulate telson and two ovate 

 blades of about equal length as the telson. 



The eyes are large, renif orm ; extending about as far as the rostrum, 

 with the upper surface flat ; the outer and lower surfaces very convex. 



The antennulae are not very concave beneath the eye and have the 

 outer lateral margin, a thickened ridge, produced distally into an 

 acute spine which extends half the length of the second segment; 

 the second segment is cylindrical, short, ciliated; the third segment 

 is only half as long as the second segment, cylindrical; the two 

 branches of the flagellum are of nearly equal length, each about equal 

 in length to the two preceding peduncular joints. 



The antennae have a short basal article with an acute spine at the 

 outer distal angle; the scaphocerite is as long as the peduncular 

 articles of the antennulae, with the outer lateral margin much thick- 

 ened, terminating distally in an acute spine. The distal margin is 

 evenly convex, ciliated. The second peduncular article is short, 

 cylindrical; the third article somewhat elongated, extending three- 



