184 
GAMMARIDiE. 
A M PHI POD A . PH OXIDES. 
NAT ATOM A. 
Specific character. Cephalon produced to an obtuse point. Fourth seg- 
ment of the pleon considerably narrower than the third. Superior antenna; 
longer and stouter than the inferior. 
Length 5g inch. 
Darwinia compressa. Spence Bate, Brit. Assoc. Rep. 1855, p. 58. Ann. 
Nat. Hist. 1 ser. xix. p. 141, Feb. 1857. Cat. 
Amph. Crust. Brit. Mus. p. 108, pi. xvii. fig. 7. 
White, Hist. Brit. Crust, p. 176. 
The head is produced anteriorly to an obtuse point. 
The body is much distended, and increases in breadth to 
the third segment, whence it as gradually decreases pos- 
teriorly. The tail is narrow, with the third segment 
shorter than the preceding ; the three last segments are 
extremely short, and generally lie folded, closely com- 
pressed, beneath the body of the animal, a circumstance 
which suggested the specific name. The eyes are round, 
and situated between the superior and inferior antennae. 
The superior antennae are about one-fourth the length of 
the animal, but longer and more robust than the inferior ; 
