160 Bulletin, Vanderbilt Marine Museum, Vol. Ill 



is two branched, the longer, slenderer branch composed of thirty-two 

 articles and extending beyond the scaphocerite a short distance; the 

 thickened branch consists of 22 to 24 short articles and bears a dense 

 brush of setae on its upper surface. 



The antennae have the basal article slightly longer than the eye 

 and produced on its outer lower and upper margin each into an acute 

 spine ; the scaphocerite has the outer margin thickened and terminat- 

 ing distally in an acute spine that extends quite as far forward as the 

 distal margin of the rounded inner part of the scaphocerite, which is 

 ciliated; the second and third pedunculate articles, which are cylin- 

 drical, lie beneath the scaphocerite, extending half its length; the 

 flagellum is very slender, multiarticulate, about as long as the body 

 of the shrimp. 



The external masillipeds are heavy, long, leg-like, exceeding in 

 length the first pair of legs ; the distal joint is rather flattened dorso- 

 ventrally and very setiferous, armed on the distal margin with 8 to 

 10 black acute spines; the preceding article has two spines at its dis- 

 tal margin. 



The first legs are chelate, rather short and stocky, with the carpus 

 half as long as the propodus, the palm is convex, moderately swollen, 

 the fingers not quite as long as the palm, convex, the upper finger 

 curved, bifid at the tip, horny; the lower finger with an acute, up- 

 curved tip fitting between the tips of the upper finger. 



The second legs are extremely slender, slightly longer than the first 

 pair, the ischium elongated, subequal to the merus, the carpus com- 

 posed of seven subequal joints ; the propodus small, the palm scarcely 

 longer than the last article of the carpus; the fingers slender, acute 

 tipped, with several small, accessory spines near the tip. 



The third, fourth and fifth legs are subequal, stronger than the first 

 pair, long, slender, the merus elongated; the carpus is one-third as 

 long as the merus, with a rounded process on the anterior distal mar- 

 gin ; the propodus is about as long as the ischium and merus consid- 

 ered together; subcylindrical, compressed laterally, armed on the in- 

 ferior lateral margin with a continuous double row of acute brown 

 spines; the dactyl is only one-fourth as long as the propodus and 

 armed with three acute brown spines on its inferior lateral margin 

 and two much larger, curved spines at the apex, giving it a decidedly 

 bifid appearance. 



The pleopoda are very stout; their mode of protecting the eggs is 

 well illustrated in the accompanying figure. 



