GA.MMAKlll.i:. lly 



sooondarv appoiidnp:o noarly as long as the piinuuN . liit'ciior 

 antenmv; having tlio foiiith and fifth joints subcMjnal and three 

 times as long as the third ; llagelluni not so long as the til'th joint 

 of the peduncle. Gnathopoda similar in form ; the second pair 

 largei- than the first, ha^*ing the carpus veiy short, inferiorly pro- 

 duced ; propodos ovate, tapering ; palm occupying nearly the 

 whole of the inferior margin, ciliated with hairs of irrcgidar fonn, 

 alternately long and short, each carrpng two minute cilia upon 

 the anterior margin, and short hoolcs directed posteriorly ; dac- 

 tylos long, curved, denticulated upon the inner margin. Two 

 anterior pairs of pereiopoda slender and short ; the three posterior 

 pairs gradually increasing in length ; the basos in each is ovate, 

 and successively broader, the last two being posteriorly serrated ; 

 the dactyla upon all the pereiopoda arc long, slender, and styli- 

 form. Posterior pail" of pleopoda styliform, almost naked. Telson 

 membranous, ovate. 

 Length ^ths of an inch. 



Huh. Dredged in Plymouth Sound {Mr. T. P. SmtftJi and V. ,b'. B.). 



The colour of this animal is white, with a rich crimson blotch 

 near the middle which is very conspicuous, and readily enabled me 

 to identify' eveiy specimen that I took. The propoda on the gnatho- 

 poda are of a rosy hue, and a tinge of the same colour may be ob- 

 served at several of the articulations of the pereiopoda. 



31. PH^DRA. 

 Phaedra, S^ence Bate, Quart. Joitrn. Geol. Soc. p. 187, 1858. 

 Cephalon not much produced over the peduncles of the antenna). 

 Segments of the pcreion very short, of the plcon voiy long. Eyes 

 (not made out). Superior antennai shorter than the inferior, ap- 

 pbndiculatcd. Gnathopoda (not made out). Coxa? small. Three 

 posterior pairs of pereiopoda siibecpial. Posterior pair of pleopoda 

 biramous. Telson squamiform, simple. 



This genus is one of considerable interest in consequence of its 

 appr(jximation to the only fossil Amphipod that has yet been dis- 

 covered. 



1. Phaedra Kinahani, n. s. (Plate XXI. iig. 1.) li.^Sl. 



Cephalon produced anteriorly, slightly depressed. Six segments of 

 the pcreion very short; seventh as long as those of the pleon. 

 Tlu-ee posterior segments of the pereiou and five of the pleon 

 centrally and dorsaUy produced posteriorly, the last three into pro- 

 minent teeth. Eyes small, round, l^huk. Sui)erior antennoD ha^^ng 



