AMPELISCA BELLIANA. 



AM PHI POD A. 



NATATOliTA. 



135 



AMPELISCIDES. 



AMPELISCA BELLIANA. 



Specific character. Tliird segment of the pleon liaviug the posterior lutir- 

 gin deeply bisinuated on each side. Superior antennie shorter than the 

 peduncle of the inferior. 



Length rather more than \ inch. 



Tetromatus BeUiaims. Spence Bate, Brit. Assoc. Rep. 1855, p. 58. Ann. 

 Nat. Hist. xix. 139. Cat. Amph. Brit. Mus. 

 p. 93, pi. XV. fig. 3. White, Hist. Brit. Crust, 

 p. 171. 



This animal, in its general appearance, resembles A. 

 Gaimardii, but may be distinguished from it by the 

 contour of the posterior margin of the tenth segment 

 after the head ; on each side it is waved, having a deep 

 indentation near the upper part, a prominent lobe about 

 the middle, a second indentation below the lobe, beneath 

 which the inferior margin is produced to a sharp slightly 

 upturned process, or tooth. 



The superior antennae are not longer than the head. 

 The first joint of the peduncle is very short, scarcely 

 longer than broad; the second joint is about twice the 



