MONTAG TJA ALDERI. 
61 
A MP HI POD A . STEGOCEPIIA LIDES. 
NATATOUIA. 
Specific character. Second pair of gnathopoda having the propodos short ; 
palm serrated near the base of the dactylos, and deeply emarginated near the 
inferior angle, which is produced to a sharp point. 
Length, of an inch. 
Montagna Alderii, Spence Bate, Rep. Brit. Assoc. 1855. Synop. Brit. 
Amph. Ann. Nat. Hist. 1857, xix. 137. Cat. of 
Amph. Brit. Mus. p. 57, pi. viii. fig. 6. White, Pop. 
Hist. Brit. Crust, p. 166. 
The eyes, as in all the other species of the genus which 
we know, are round and red. The superior antennae are 
nearly one-half the length of the animal, having the 
flagellum rather longer than the peduncle. The inferior 
antennae are longer than the superior, and the peduncle 
reaches nearly to the extremity of the superior antennae ; 
the two last joints of the peduncle are nearly of equal 
length, the last being rather the shorter, and the flagellum 
is not longer than the last joint of the peduncle. The 
first pair of legs are slender, and have the fourth joint 
