240 



HOLMES 



large and elongated ; hand oblong, broader and much longer than the 

 carpus, the palm oblique, with a broad tooth at the posterior end and 

 having a concavity in the center in which a large tooth is situated. 

 Posterior peraopods rather slender, with the basal joints comparatively 

 narrow. Uropods slender and projecting backward to about an equal 



Fig. 124. Gammarofszs tenuicornis. 



distance, the first pair with the rami of equal length and a little shorter 

 than the peduncle ; outer ramus of the second pair shorter than the inner ; 

 rami of the posterior pair subequal and about as long as the peduncle. 

 Telson nearly square, somewhat incised posteriorly, each lobe with a 

 strong terminal spine and several setae. 



Length 9 mm. 



In the elongated gnathopods this species resembles Megamophus^ but 

 differs from that doubtfully distinct genus in having a much longer 

 secondary flagellum on the first antennae. From Gammaropsis eryihroph- 

 ihalmus (Lillg.) this species differs in having more slender antennae and 

 much more elongate and differently formed gnathopods. It is appar- 

 ently more nearly allied to G. inelanops Sars, but it differs from that 

 species in having the postero-lateral angle of the first coxal plates 

 strongly serrated, in having a longer accessory flagellum on the anten- 

 nules, and in the form of the telson. From G. nana Sars it differs in 

 having elongated instead of round eyes, in having a long accessory 

 flagellum on the antennules, and in the form of both pairs of gnathopods. 

 ( See accompanying figures.) 



