CAPRELLA ACUTIFRONS. 61 



fourth, which in the female carry the ovigerous plates, 

 have, in the male, the lateral walls (coxae) produced into 

 lateral plates, which are produced anteriorly to a point. 

 The superior pair of antennae are about two-thirds the 

 length of the animal, the flagellum is shorter than the 

 peduncle, and each articulus is infero-distally produced, 

 and furnished with cilia. The inferior antennae are 

 about the length of the peduncle of the superior, termi- 

 nating in a short flagellum, which consists of a long and 

 a short articulus. The first pair of legs are short, but the 

 form of the hand resembles that of the second. The 

 second pair of legs are longer than the first. In the 

 female they articulate with the extreme anterior limits of 

 the second segment, but in the male they articulate a 

 little posteriorly. The hand, in the male, is ovate, 

 tapering to the distal extremity ; the palm is waved, and 

 defined by a strong tooth, armed with a stiff spine. In 

 the female the palm is less distinctly waved and de- 

 fined. The three posterior pairs of legs are short and 

 robust. 



The only animal that we have seen alive was covered 

 with numerous points or fine hairs. It was of a reddish 

 colour, shaded off into green. 



This species appears to be one of the least dispersed in 

 the British seas, and our observations have consequently 

 been the more restricted. 



It was found by Dr. Leach on the Devonshire coast, 

 and it has since been taken in Plymouth Sound by 

 Mr. Boswarva. " Not uncommon among Corallines in 

 Mount's Bay." Mr. R. Q. Couch. 



Van Beneden states, that it is found in great abundance 

 on the shores of Belgium, in the middle of tufts of con- 

 fervae along with Tanais, upon the carapace of Chelonia 

 my das. 



