54 STALK-EYED CRUSTACEA 



postfrontal portion of the carapace ; horns slender, acute, 

 diverging. Orbit large, with one sharp tooth on the upper 

 margin, near the base of the postocular tooth. Praeocular 

 pine slender, acute. Basal joint of external antennae has 

 a spine in front, which is smaller than the praeocular 

 spine, and a second spine on the inner side near its 

 base. 



Range. — West Indian Sea. 



3. Pisa erinacea. 



Pisa erinacea . . A. Milne Edwards. 



Carapace pyriform, covered with short hairs ; regions 

 well marked ; there are five spines in the middle line, two 

 in the gastric region, the posterior is the larger, and 

 resembles a sharp tubercle ; three on the cardiac region, 

 the central one the shortest. The branchial region has 

 two large spines and two tubercles placed more in front. 

 The lateral borders have four tubercles. The rostrum is 

 formed of two long thin horns, soldered together at their 

 base, free and diverging at their extremities. Internal 

 orbital angles spiniform, but slightly advanced. Basal 

 joint of external antenna; broad, and separated from the 

 suborbital border by a deep notch. Walking legs thin 

 and long. 



Range. — West Indian Sea. 



3. Sisyphus. 



Sisj'p/iiis ... A. Milne Edwards, Desbonne and 

 Schramm. 



Carapace oval or pear-shaped, depressed, covered, as 

 well as the legs, with short brown hairs. There is no 

 praiocular spine. The front is formed of two rostral 



