334 AMPniPODA NOltMAI.I A. 



produced to half the U'ugtli of the propodos, coarsely serrated both 

 anteriorly and inferiorly, the teeth iipon the inferior marf>in being 

 themselves posteriorly serrated ; propodos short, stout, curved, and 

 serrated on the inferior margin ; dactylos short, sharp, and capable 

 of antagonizing with the produced extremity of the carjius. Second 

 pair of gnathopoda resembling the first, but rather longer and a 

 little larger, the inferior angle of the carpus more produced an- 

 teriorly, but the teeth themselves upon the inferior margin not 

 seiTated, First pair of pereiopoda feeble, slender, slightly denti- 

 culated along the posterior margin of the meros, carpus, and pro- 

 podos : second pair a little longer than the first, and denticulate 

 only on the postez'ior margin of the propodos : third pair having 

 tiie basos dilated, but not broader than the coxa, and about one- 

 third its length; remaining joints articulated at the extremity, 

 and together as long as the basos : fourth pair having the basos 

 broader, but scarcely longer, than the third; remaining joints arti- 

 culated at the extremity, together scarcely as long as the basos, 

 and having the flexible margin minutely denticulated : fifth paii' 

 having the basos dilated, nearly as large as that of the third, ovate ; 

 remaining joints articulating at the apex, together scarcely half 

 the length of the basos ; dactylos a rudimentary curved hook. 

 Antepenultimate pair of pleopoda having the rami substyhform ; 

 penultimate paii' arising within the preceding, having the rami 

 foliaceous, lanceolate ; ultimate pair foliaceous, terminating ob- 

 tusely. Telson triangular, with the base as broad as the preceding 

 segment. 

 Length | of an inch. 



Hah. Not recorded. Taken by M. Morrisse of Havre. 



The animal from which the description and figure are taken is a 

 female, in the incubatory pouch of which I found numerous young. 

 These differ considerably from the parent. The following is the 

 description of the young when ready to quit the pouch : — 



Young. — Animal long and narrow. Cephalon anteriorly produced. 

 Superior antennae as long as the cephalon, consisting of four 

 joints, the last of which is considerably narrower than the rest. 

 Inferior antennne obsolete. First pair of gnathopoda having the 

 inferior angle of the cai-pus anteriorly produced to a sharp tooth ; 

 propodos having the inferior angle anteriorly produced to a sharp 

 tooth, nearly as long as the dactylos, the anterior margin or palm 

 being as long as the propodos ; dactylos sharp and slightly arcuate : 

 second pair uniform Avith the first. First two pairs of pereiopoda 

 not differing materially from those of the adult, except in being 

 proportionally larger, as, in fact, are all the poda : third pair re- 



