572 



PROCEEDINGS OF TEE NATIONAL MUSEUM. 



VOL. 45. 



13-segmented; accessory flagellum, 5-segmented. Antenna 2 about 

 as long as antenna 1 ; flagellum about as long as peduncle. Gnatlio- 

 pod 1 in male with palm somewhat oblique, larger than gnathopod 2, 

 in which the palm is transverse. Uropod 3 elongate, rami fringed 

 with plumose setae and spines; inner ramus three-fourths as long as 

 first segment of outer ramus; second segment of outer ramus, small. 

 Telson cleft to base, with three pairs of spines along outer margins 

 and a seta near tip. Length, 9 mm. 



Type-locality. — St. Paul, Pribilof Islands; from skeletonizing box. 

 November 30, 1911. 



Type.— Cat. No. 45710, U.S.N.M. 



Fig. 1.— Gammarus pkibilofensis. o, first antenna; g^, first gnathopod; g^, second gnathopod; 



t. telson; wi, u'^, u', uropods. 



CHIRONESIMUS MULTIARTICULATUS, new species. 



Body robust, back broadly rounded. Cephalon about, the length 

 of the first body segment, lateral corners produced and rounded. 

 Anterior coxal plates twice as deep as the body; first pair shghtly 

 expanded below, rounded at anterior angle; fourth pair deeply 

 emarginated posteriorly and forming a rather angular expansion 

 below; fifth pair small, longer than deep. Third epimeral plates of 

 abdomen produced at posterior angles and somewhat upturned. 



Eyes oval, broader below, constricted in the middle. First antennae 

 as long as cephalon and first two body segments combined; first 

 segment of peduncle very large and thick; flagellum more than twice 

 as long as peduncle, 28-30-segmented ; 18-segmented in female; 

 accessory flagellum about as long as pedimcle, 8-segmented in male, 

 7-segmented in female. Second antennae usually folded under body, 



