218 AMPHIPODA NOKMALIA. 



convex, not dettned. Fifth pair of pleopoda shorter than the 

 fourth ; sixth having one ramus considerably longer than the other, 

 very minute. 



Length ^^ths of an inch. 



Hah. Asiatic llussia. 



25. Gammarus confervicolus. (Plate XXXVIII. fig. 9.) B.M. 



Gamniarus confervicolus, Stimpson, Journ. Bost. Soc. Nat. Hist. vi. 

 Mujra coufervicola, Stimpson, Proc. Calif. Acad. Nat. Sci. i. 90. 



Pasciculi of spines upon the three posterior segments of the pleon. 

 Eyes reniform, black. Antennco subequal, nearly half the length 

 of the animal. Gnathopoda subequal ; first pair having the palm 

 slightly more oblique than that of the second, and armed with a 

 greater number of short obtuse-pointed spines, each carrying a 

 subapical cilium. Pereiopoda subequal. Posterior pair of pleopoda 

 having the outer ramus considerably longer than the inner. 



Length ^ths of an inch. 



Hab. " Among Confervae in salt marshes near San Francisco. A 

 few specimens were found in the stomach of a salmon taken in Puget 

 Sound." — Stimpson. 



I am indebted to Mr. Stimpson for the specimen from which I 

 have taken the accompanying figure and descrijjtion. 



26. Gammarus locustoides. (Plate XXXVIII. fig. 10.) B.M. 



Gammarus locustoides, Brandt, Sibirische Reise, Zool. i. pi. 6. f. 30. 

 Stimpson, Proc. Acad. Nat. Sci. Philad. 1855. 



Postero-inferior angle of the thii'd segment of the pleon forming a 

 right angle. Eyes reniform, black. Superior antennaj not quite 

 so long as the inferior; inferior antennae having the peduncle 

 longer than the peduncle of the superior. Gnathopoda subequal : 

 first pair having the propodos ovate, palm slightly oblique, not 

 defined, armed with eight or nine short obtuse-pointed spines ; 

 second pair having the propodos long-quadrate, palm not obKque, 

 imperfectly defined, armed with six or seven short obtuse-pointed 

 spines, each spine subapically tipped with a cilium. Pereiopoda 

 subequal. Posterior pair of pleopoda having one long and one 

 short ramus. 



Length ^uths of an inch. 



Hah. Japan (Stitnpson). 



The description and figure are taken from a specimen sent me by 

 Mr. Stimpson. 



/ 



