AMPELISCA BELLIANA. 
135 
AMPHIPODA. AMPELISCIDES. 
NAT AT OUT A. 
Specific character. Third segment of the pleon haying the posterior mar- 
gin deeply Insinuated on each side. Superior antennae shorter than the 
peduncle of the inferior. 
Length rather more than ^ inch. 
Tetromatus -Bellianus. 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 
