682 CRUSTACEA. 



near inner angle of apex ; it has no palpus. Caudal lamellae not 

 matured, hardly half as long as caudal segment, the outer longest. 



ZOEA ECHINUS. 



Carapax brevis, valde convexus, et compressus, longd rostratus, et postice 

 spind longiore quam carapax fere horizontali armatm, latere prope 

 medium spini-acuto. Segmentum caudale profunde et acute furcatum, 

 brachiis divaricatis. 



Carapax short and very convex, compressed, a long beak and a spine 

 behind nearly horizontal, longer than the carapax, side near middle 

 with an acute process. Caudal segment acutely furcate, the prongs 

 divaricate. 



Plate 45, fig. 10 a, animal, enlarged; b, vertical view of carapax, 

 (showing at 1, the beak ; at 2, the posterior spine ; at 3, 4, the lateral 

 spines ; at 5, 6, the antennae) ; c, leg of first pair. 



Atlantic, latitude 23 south, longitude 41 5' west. Collected, 

 November 19, 1838. 



Length, one-twentieth of an inch. The carapax is very broad and 

 high for its length. The posterior spine arises from near the posterior 

 margin, and the lateral spines from near the middle of either lateral 

 surface. 



The eyes are very large, on short peduncles. Abdomen six-jointed, 

 the joints oblong, apical terminating in two long, curved, divergent 

 prongs, having three parallel hairs within, and one on outer margin. 

 The heart was distinct in upper part of thorax, in advance of the 

 dorsal spine. The particles in the blood were rather large and very 

 distinct. 



Two pairs of feet large and similar, the terminal portion two-jointed 

 and nearly as long as basal, against which it is usually folded up ; it 

 terminates in a few long hairs. Beside this, there is also another 

 branch, consisting of five joints, which is commonly projected outward. 



Other legs anterior to these were not particularly examined. They 



