8 Mr. C. S. Bate on the Morphology of some Amphipoda 



than broad, as broad at the base as the preceding segment, and 

 as long as the posterior pair of pleopoda. 



Length f of an inch ; young less than -^ of an inch. 



It was taken by M. Morrisse of Havre, but unfortunately the 

 habitat has not been recorded. 



The specimen from which the above description was taken 

 was found upon examination to have within the incubatory 

 pouch many young, which could not very long before have 

 quitted the protection of the egg-case. The following is a de- 

 scription of one of them : — 



Cephalon long, and tapering anteriorly to a point. Pereion 

 not laterally compressed. Pleon having the fifth segment not 

 developed, or fused with the preceding. Eyes not visible. Su- 

 perior antennae on the inferior surface approximating to the 

 anterior margin of the cephalon, consisting of five joints, the 

 second and third being each half the length of the first ; fourth 

 longer than the two preceding, and narrower ; fifth short, nar- 

 row and tapering. Inferior antennae obsolete*. Oral appendages 

 rudimentary. First pair of gnathopoda well developed, tolera- 

 bly robust, nearly chelate ; carpus infero-anteriorly produced to 

 a sharp point, reaching more than half the length of the propodos; 

 propodos scarcely as broad as the carpus, having the inferior 

 angle anteriorly produced to a sharp point, nearly as long as the 

 dactylos ; dactylos long, sharp, slender, curved. Second pair 

 of gnathopoda like the first. First and second pairs of pereio- 

 poda uniform, simple; dactylos long, curved, and powerful. 

 Third pair long and slender; basos not dilated ; ischium short; 

 remaining joints rather long, subequal ; dactylos slender, curved. 

 Fourth pair as long as the preceding, but developed into a cheli- 

 form organ ; propodos having the antero-distal angle produced 

 into a long narrow process, nearly as long as the dactylos; dac- 

 tylos long, slender, and slightly curved. Fifth pair of pereio- 

 poda short ; basos but little shorter than that of the preceding 

 pair ; ischium and meros subequal, short, not longer than broad ; 

 carpus as long again as the meros ; propodos tapering, sub- 

 apically tipped with a curved spine that represents the dactylos. 

 Three anterior pairs of pleopoda consisting each of a peduncle 

 and two rami, each ramus consisting of two articuli, one long, 

 the second rudimentary, each articulus being tipped with two 

 long hairs. Three posterior pairs of pleopoda likewise biramous, 

 the rami being sharp, straight, styliform, and unequal, the inner 

 ramus being the shorter : antepenultimate and penultimate pairs 

 of pleopoda apparently attached to the latero-posterior extremity 

 of the fourth segment of the pleon, the fifth segment being pro- 

 * I have not, with careful scrutiny, been able to make them out. 



