180 AMPIIIPODA NOUMALIA. 



1. Ganimarella brevicaudata. (Plate XXXII. fig. 8.) B.M. 



Gaiumarud bivvicaudatu.s, Edwards, Ann. des Sc. Nat. xx. p. 309 ; 



IL'sf. des Crust, iii. p. 53. 

 Ganiiiiarella f^rchcstiformis, Sponce Bate, Attn. Nat. Hist. Feb. 1857. 

 indtc, Hist. Brit. Crust, p. 181. 



Eyes small, round, black. Superior antenna) half the length of the 

 animal ; first and second joints of the peduncle long, thii-d short ; 

 flagclhmi as long as the peduncle, secondary appendage four- 

 articulated. Inferior antennte having the peduncle nearly as long 

 as the peduncle of the superior pair ; flagelkim not longer than 

 the last joint of the peduncle. First foxu- pairs of coxa) deeper 

 than their respective segments. Fii-st pair of gnathopoda small ; 

 carpus longer than the propodos ; propodos longer than broad, palm 

 oblique. Second pair of gnathopoda very large; carpus extremely 

 short ; propodos ovate, slightly tapering to the di.stal extremity, 

 as long as the cephalon and fii'st two segments of the pereion, palm 

 embracing nearly the entire length of the inferior margin, armed 

 with short eqmdistant spines ; dactylos nearly as long as the pro- 

 podos, slightly arcuate. First two paii-s of pereiopoda slender; 

 three posterior pairs robust, having the basa ovate, but increasing 

 in diameter in each successively posteriorly ; the mera, carpi, and 

 propoda arc subequal, and the dactyla very short. Three posterior 

 pairs of pleopoda subequal, the ultimate having a single branch ; 

 but a short stout spine (the rudiment, perhaps, of a second branch) 

 is attached laterally to the summit of the peduncle. Telson broad, 

 short, divided nearly to the base, and subapically tipped on each 

 division with a short spine. The animal is of a dark olive-green 

 colour'. Under the microscope, the skin is seen to be covered 

 with stiff denticles and spots, the latter being formed by several 

 little spines. 



Length ^ an inch. 



Hab. Polperro (Mr. Louglirin) ; Morbihan (Mihie-Edivards). 



I have had an opportunity of comparing the tj-pe of M. -Edwards's 

 species with the present, and the only differences between the 

 di-a^\ing made from that taken at Polperro and that which I took 

 from the specimen in the Museum of the Jardin des Plantes, are, that 

 in the latter the eyes are somewhat reniform, the basa of the two 

 posterior pairs of pereiopoda are distaUy tapering, and the dactylos of 

 the second pair- of gnathopoda is straight. 



2. Gammarella Brasiliensis. (Plate XXXII. fig. 9.) 

 Gammarus Brasiliensis, Dana, U. S. JExplor.Exped. p. 956. pl.65.f. 10. 

 " MaU. — Coxae large ; fifth much shorter than fourth. Superior 

 pair of antenna) twice as long as inferior, about half as long as 



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