46 CAPRELLID.E. 



Caprella spinosa. Gtoodsir, Edin. Phil. Journ. xxxiii. pi. 3, 



f. 1-3. Whitk, Pop. Hist. Brit. Crus. p. 197. 



Protella phasma. Spence Bate, Cat. Amph. Brit. Miis. p. 351, 



pi. Iv. fig. 4. 



Asiams pthasma. Pennant, Brit. Zool. iv. p. 27, Edit. 1812 



(descr. only). 



The head of tliis species is rounded in front, while a 

 sharp, strong tooth, directed forwards as well as upwards, 

 is situated upon the dorsal surface of the posterior mar- 

 gin just where the head is contiguous with the first joint 

 of the body, from which it can scarcely be identified. 

 The first joint of the body is likewise furnished with a 

 similarly strong, sharp-pointed tooth, situated near its 

 posterior margin. The second segment carries near the 

 centre a pair of strong teeth, one on each side of the 

 dorsal median line, as well as a third, situated in the 

 middle of the dorsal surface, near the posterior margin. 

 The third and fourth segments exhibit rudimentary pro- 

 cesses, probably representing teeth in similar positions. 

 The superior antennae are rather more than half the 

 length of the animal. The inferior antennae are about 

 half the length of the superior. The first pair of legs 

 are short ; the hand triangular ; the palm defined by a 

 sharp process. The second pair are very much longer; 

 the hand is large, elongate -ovate, the palm having a deep 

 excavation near the anterior extremity, and defined by a 

 prominent blunt tooth, surmounted by one or more 

 spines. The finger articulates with the hand somewhat 

 before the apex, so that a sharp process is produced 

 above and beyond the articulation. The three posterior 

 pairs of legs have the hands arcuate, the anterior margin 

 being armed with small tubercles, surmounted by a spine, 

 and defined by a strong process, which is surmounted by 

 several short spines directed towards the extremity, and 



