228 
GAMMARIDiE. 
AMPHIPODA. PHOXIDES. 
NATATORIA. 
PEREIONOTUS TESTEDO. 
Specific character. All the segments of the pereion, and the first of the 
pleon, elevated into a strong -dorsal carina, the apex being longitudinally 
shorter than the base, in every segment except the first of the pleon, in 
which the carinated process is posteriorly produced to a round point. 
Length 5 2 g inch. 
Oniscus testudo. Montagu, Linn. Trans, ix. p. 102, t. v. fig. 5. Leach, 
Edin. Encyc. vii. p. 405, gen. lxvi. (not of Gosse and 
White). 
The head is short and anteriorly depressed, possessing 
but a very minute central point between the antennas. 
All the segments of the body are dorsally elevated into 
a carina, flat at the top. The first segment of the 
tail is likewise similarly elevated, but is projected pos- 
teriorly, the carina terminating in a round process ; 
each of the segments of the body is also marked by 
a small tubercle at the infero-anterior angle. The su« 
