GAMMA KID.K. 170 



with throe minuto hairs. Eyes impci-foctly formed, lemon-colour. 

 Superior antennie about one-fourth the length of the animal ; 

 ])0(lunfk- liaving the fii-st joint shorter than the succeeding ; 

 tiagi'llum not longer than the peduncle, secondaiy appendage 

 consisting of one long and one short articulus ; mandibles having 

 the joints of the appendage short and distally increasing. First 

 pair of gnathopoda having the propodos q\iadrate; palm slightly 

 convex, oblicjue, armed with a few forked spines. Second pair of 

 gnathopoda longer and more slender than the first, having the 

 propodos long-ovate ; paljn very oblique and imperfectly defined, 

 armed with a few spines, each canying a subapical cilium ; 

 dactylos with a small internal cilium near the apex. Pereiopoda 

 subequal, unguiculate ; throe posterior pairs having the basa 

 ovate, and posteriorlj- fringed with short equidistant cilia. Three 

 posterior pairs of pleopoda subequal, furnished with strong hairs 

 or spines, each carrying a subapical cilium ; the ultimate pair 

 having the peduncle shorter than the ramus. Telson half as long 

 as the posterior pair of pleopoda. 

 Length ^^jths of an inch. 



Hah. Pump at llingwood {Rev. A. R. Hogan). 



2. Crangonyx Ermannii. (Plate XXXII. fig. 7.) 

 Gammarus Ennaunii, Edtcards, Hist, des Crust, iii. p. 49. 



Eyes round, small. Superior antennae longer than the inferior, 

 flagellum longer than the pcdimclc, secondary ajjpendage short. 

 Gnathopoda subequal and ahke ; propoda ovate ; palmoe nearly the 

 whole length of the inferior margin, obhque, not defined. Poste- 

 rior pair of pleopoda short, ramus clean, reaching but little be- 

 yond the extremity of the preceding pair. 



Length ^ths of an inch. 



Hah. Warm springs of Kamtschatka {M. Ermann). 



The description and figure are taken from the specimen preseiwed 

 in the Museum of the Jardin des Plantes. 



58. GAMMARELLA. 



Gammarella, Spence Bate, Si/nopsis, i^-c, Ann. Nat. Hist. Feb, 1857. 

 mute, Hist. Brit. Crust, p. 181. 



Antenna) subequal ; superior pair having a secondary appendage, 

 Gnathopoda unequal, subchelatc ; second pair large and powerful. 

 Posterior pair of pleopoda uuibranched. Telson single, divided. 



n2 



