STALK-EYED CRUSTACEA 335 



there is a tubercle. First three teeth of lateral margin 

 subspiniform ; posterior one, situated at the lateral sulcus, 

 as large as the others but less acute. 



External maxillipedes elongated ; fourth joint large, 

 longer than the third, with its antero-exterior corner 

 prominent, forming a sharp right angle. 



First pair of legs rather short and stout, nearly smooth ; 

 inferior edges of the third and fourth joint granulated ; 

 fifth joint dentated at anterior angles with small teeth ; 

 hand short, smooth externally ; palm shorter than finger, 

 and armed with two or three small spiniform tubercles 

 on basal half of its superior margin. 



Walking legs rather slender, smooth. Last pair of 

 legs much longer than penultimate pair. 



Penultimate joint of abdomen in the male elongated 

 and slender ; terminal joint longer than broad ; none of 

 the joints soldered together. 



Range. — St. Thomas, Grenada. 



3. Hypoconcha. 



Hypocondia . Guerin-Men6ville, Stimpson. 



Carapace flattened, membranous above ; the anterior 

 border arcuate and sharply defined, overhanging a tri- 

 angular frontal region, the apex of which is directed 

 downwards. External maxillipedes with the fourth joint 

 large, and their external lateral angle somewhat pro- 

 duced ; the external appendage (exognath) robust. The 

 two last pairs of legs have their last joint terminating 

 in a Y-shaped end. Sternal sulci in the female widely 

 separated, each terminating in a tubercle opposite the 

 basal joint of the second walking leg. 



Range. — West Indian Sea to Florida; in shallow 

 water. 



