LONG-LEGGED SPIDER-CRAB. 3 



patic region, forming, with one on the gastric region, an 

 equilateral triangle ; there are two small ones on each 

 branchial region, and one, the largest of all, on the cardiac ; 

 there are also one or two smaller ones near the latero- 

 anterior margin. The rostrum is of moderate length, 

 scarcely reaching to the middle of the third joint of the 

 peduncle of the antenna?; it has a groove through its 

 whole length, reaching to the back of the orbit. The ex- 

 ternal antenna- are long and setaceous, and furnished with 

 several long hairs; the basal joint is narrow, entirely im- 

 moveable, and continuous with the epistome ; the move- 

 able part of the peduncle consists of two joints, of which 

 the second is three times a^ long as the first. The internal 

 antenna' are lodged in fossa 1 , which are separated from 

 each other by a ridge, which is incomplete at the middle. 

 The eyes are oval, larger than their peduncles, and pointed 

 at the apex, where there is a small bristle.* The orbits 

 are round, and there is a prominent ridge over the upper 

 margin. The epistome, or that portion of the shell be- 

 t \\ eeii the mouth and the base of the antenna?, has a very 

 minute tubercle, just in front of the organ of hearing, but 

 none at the base of the antenna?, as in St. tenuirostris."^ 

 The first pair of legs in the male are about twice as long 

 a- the body ; the arm has a line of minute tubercles on 

 the outer, and another on the inferior surface, which parts 

 are also hairy ; but there are no spines on its inner margin, 

 as in St. tenuirostris : the wrist is similarly furnished : 

 the hand is somewhat ventricose ; it is hairy both on the 

 outer and inner margin ; the fingers are slightly inflected ; 

 the moveable one is furnished with a tubercle near its base, 



* This curious appendage I have never seen mentioned as appertaining to this 

 genus. 



f This second tubercle is also found in a Mediterranean species St. JEgypffau, 



B 2 



