64 
GAMMA RULE. 
AMPHIPODA. STEGOCEPHA LIDES. 
NAT ATOM A. 
Specific character. Second pair of gnathopoda having the propodos as 
long again as broad ; palm advanced, deeply notched just within the inferior 
angle, which is produced into a tooth, internally concave. 
Length, | inch. 
Montagna pollexiana, Spence Bate, Brit. Assoc. Report, p. 57, 1855. Synop- 
sis, Ann. Nat. Hist. 1857, xix. 137. Cat. Amph. 
Brit. Mus. p. 57, pi. lx. fig. 2. White, Pop. Hist. 
Brit. Crust, p. 167. 
The eyes are small, round, and probably red ; we 
have, however, only seen dried or dead specimens, from 
which all colour rapidly passes away. The superior 
antennae are nearly two-thirds the length of the body, 
having the first joint of the peduncle longer than the 
head, the second joint a little shorter than the first, and 
the third small, not being distinguishable from the 
articuli of the flagellum. The inferior antennae are 
