214 AMnilPODA NOKMALIA. 



equal, and iu the second pair ha\ing the dactylos pilose and little 

 dcntatcd." — IJljehorg. 

 •' Length 3| lines." — Rnthhe. 



Hah. "■ Moldo " (llathke and Bnizelius). " Eastern shores of Nor- 

 way " {Llljehory). 



If). Gammarus assimilis. 



Gamniarus assiniiliss, Liljcborq, Of vers, af Konijl. Vet. Akad. Forhandl. 

 1851, p. i>;?; lsr)4, p." 455.' 

 Bnizi'lius, Skaml. A>nph. Gamm. p. 59. 



" Resembles O. SundevalUL Differs principally in having the second 

 pair of gnathopoda in the male longer than the first ; propodos 

 elongate, nearly rectangular." 



Length 3^ lines (?). 



" Hab. Eastern shores of Norway." — L'djehorg. 



17. Gammarus tenuimanus, n. s. (Plate XXXVIII, fig. 2.) B.M. 



Eyes ovate. Superior antennae half as long as the animal. Inferior 

 antennse having the peduncle slightly longer than the peduncle of 

 the superior. Gnathopoda subcqual and of the same form, each 

 having the carpus longer than the propodos, and thickly studded 

 "sWth hairs along the inferior mai'gin ; the propodos not broader 

 than the carpus, having the inferior margin parallel with the su- 

 perior, and the palm very short ; superior margin carrying four 

 fasciculi of hairs, and the inferior margin thickly studded with 

 hairs. Pereiopoda spinous. Posterior pairs of pleopoda (wanting). 



Length ^ths of an inch. 



Hah. Taken at the entrance to the rivers Ness and Brauly, in 

 Scotland {Rev. G. Gordon). 



18. Gammarus Caspius. (Plate XXXVIII. fig. 3.) 

 Gammarus Caspius, Brmidt, Middendorff's Sibirische Reise. 



A fasciculus of spines upon a tubercle near the dorsal centre of the 

 fourth and fifth segments of the pleon. Eyes small, oval. Superior 

 antennte not so long as the inferior. Inferior antenna"! inserted 

 posteriorly to the superior, ha^dng the pedimcle reaching consi- 

 derably beyond the extremity of the peduncle of the superior. Gna- 

 thopoda subequal : second pair somewhat the larger ; carpus con- 

 tinuous with the propodos, forming together a long oval ; palm 

 oblique, not defined. Basa of the three posterior pairs of pereio- 

 poda serrated. Posterior pair of pleopoda (wanting). 



Length ^ths of an inch. 



Huh. Asiatic Russia ? {Mkldendorff). 



\ 



