86 Bulletin Vanderbilt Marine Miiseum, Vol. VI 



mally, decidedly carinate dorsally, each half sloping abruptly to 

 the lateral margin which is devoid of articulated spines, the two 

 sides converging to form a slight apex. The telson is only two- 

 thirds as long as the uropoda, both blades of which are longish, 

 narrowly ovate distally, the outer one being slightly the wider; 

 both are fringed with setae on the posterior margins. 



The eye is large, reniform, the visible portion of the stalk 

 being half as long as the rostrum ; the large cornea, with its major 

 diameter placed transversely, is a trifle longer than the rostrum. 



The antennulae have the peduncle not quite so long as the 

 scaphocerite of the antennae ; the first article laminate, concave 

 beneath the eye and dorso-distally setose ; the second article is two- 

 thirds as long as the first, chubby, cylindrical ; the third article is 

 slightly smaller and shorter than the second ; the flagellum is two- 

 branched, with the outer branch thickened proximally; the two 

 branches each approximately as long as the scaphocerite. 



The antennae have the basicerite short, without spines, the 

 scaphocerite extending beyond the antennular peduncle by a dis- 

 tance equal to about the length of the third peduncular article of 

 the antennulae. This scaphocrite is elongate-ovate, with the maxi- 

 mum width about one-third of the length ; the outer lateral margin 

 thickened, terminating in a subdistal spine, the distal margin 

 unequally convex, its greatest depth occurring at the inner side, 

 the inner lateral margin but little convex, ciliate ; the carpocerite 

 is cylindrical, scarcely one-third as long as the scaphocerite ; the 

 flagellum, fine. 



The first, second and third pairs of legs are chelate, successively 

 increasing in size and length in the order named. 



The fourth and fifth pairs of legs are monodactyl, the fifth pair 

 being very long and slender. 



The five pairs of pleopoda are strong, with the distal branches 

 slender, quite long ; the second and third pairs of pleopoda are the 

 longest of the series. 



The thelycum is well developed. Between the fifth pair of legs 

 it consists of a transverse carina with bluntly rounded ends ; this 

 carina is superimposed on the carina between the fourth pair of 

 legs, which consists of a similar, slightly wider, transverse bar, 

 the anterior margin of which is sinuate, with a shallow, blunt, tri- 

 angular, median lobe ; the process between the third pair of legs is 

 similar to that between the fifth pair of legs, except that its an- 



