272 



ALPHEAD^. 



The general form of the body is slender. The external 

 antenna have no spiniform palp at the base, which is also 

 a character of A. ruber. The internal antennas have the 

 general characters of the genus, but the specific distinctions 

 of this part are deficient. The anterior feet are in tolera- 

 ble preservation. The arm in both is about three times as 

 long as it is broad ; and on the upper surface is a small 

 spine, situated about one-third from the extremity : the 

 wrist is very short. The larger hand, which is on the 

 left side, is short, the sides nearly parallel, flattened, the 

 upper margin with two carina ; the outer side also with 

 two carinae, the inner surface rounded ; the immoveable 

 finger is much curved towards the point, which is acute : 

 there is a distinct and deep depression about the middle 

 of its grasping edge, for the reception of a strong tubercle 

 of the moveable finger ; this finger is shorter than the 

 other, and becomes broader towards the extremity, Avhere 

 its outer edge is acutely carinated. The smaller hand 

 is also bicarinated above : the fingers are slender and 

 curved, and there is thus a considerable space between 

 them excepting at the points ; their inner margins are 

 hairy. The second pair of feet are filiform, minutely 

 didactyle ; the carpus long and multi-articulate. The 

 remaining feet are slender and monodactyle. 



Such are the characters afforded by the mutilated spe- 

 cimens before me ; and I trust the description, imperfect 

 as it is, may be sufficient to enable some more fortunate 

 observer to compare other and more perfect specimens, 

 and determine with greater precision the identity of 

 this with the Mediterranean species to which 1 have 

 referred it. 



