38 Bulletin, Vanderdilt Marine Museum, Vol. II 



lum, and is about as long as the entire peduncle ; the lower branch has 

 its upper whip about half as long as the upper flagellum. There are 

 no setae on the whips. 



The external antennae have the basal article flattish, squarish, the 

 second article also flattish, somewhat longer and supporting the 

 elongate ovate scaphocerite which is a third longer than the two pre- 

 ceding articles considered together, and is very heavily fringed with 

 plumose cilia ; the inner distal angle of the second peduncular article 

 also supports the flagellum, which consists of two slender, clavate 

 articles, the proximal of which extends to midway the cornea and the 

 second article is almost as long ; the multiarticulate whip is composed 

 of about 53 rings and extends somewhat beyond the inner antennular 

 flagellum. 



The first maxillipeds are slender, small, terminating in a weakly 

 subchelate, ovate process, the finger being very weak and closing upon 

 the subcircular, laminate propodus, which is very heavily set with 

 plumose setae along its convex outer margin. 



The second maxillipeds are enormously developed, forming the 

 large retrochela which has its merus strong, fitting in beside the lateral 

 margins of the carapace and extending beyond it as far as the base of 

 the scaphocerite ; the upper lateral distal margin of the merus has a cup- 

 like excavation; the carpus is short, convex, with its lower lateral 

 margin carinate, terminated subdistally in a tooth ; the propodus is as 

 long as the merus and lies reflexed upon the excavate outer lower side 

 of the merus; the lower outer margin of the propodus is set with a 

 continuous row of small, acute denticle-like spines beneath which mar- 

 ginal lamina the lateral edge of the propodus has six excavations into 

 which the six spines of the dactyl fit like fingers into a glove; there 

 are three acute, conical movable spines on the proximal inner lateral 

 margin of the propodus ; the dactyl is strong, slender, its tip very 

 curved, long, acuminate, and with five acute, curved, spine-like teeth 

 besides the apical one, arising from its inner lateral margin and fitting 

 into the propodal as the blade of a knife fits into its sheath. 



The third maxillipeds and first and second thoracic legs are similar 

 and subequal with the basis slender, the ischium elongated slender, 

 the merus similar but not quite so long, the carpus short, its outer- 

 lateral surface convex, setose and armed distally with three very long 

 movable spines; the propodus is laminate, roughly suboval, its outer 

 margin boardly rounded, its inner, irregularly nodular, armed with 

 three or four very long, acute movable spines and with a heavy brush 



