46 MR. A. O. WALKEE ON AMPHIPODA 



the palm; dactylus reaching a little beyond the strong spine 

 at the palmar angle. Side-plates expanded and rounded in front. 



Second gnathopods normal. 



Perseopods : first and second with a few sefcse on the hind 

 margin of the 2nd, 3rd, and 4th joints aud about 11 small spines 

 on that of the 5th joint. Side-plates of the 3rd pair about half as 

 large again as the 1st joint ; this, iu the last three pairs is 

 expanded, slightly serrate on the hind margin, and produced 

 downwards to the 3rd joint, which is much dilated behind ; the 

 spines few and shoi't. 



TJropods : first and second pairs with rami a little shorter than 

 the peduncles, subequal, sparingly spinous ; rami of the 3rd 

 pair lanceolate, subequal, longer than the peduncle, almost 

 spineless, with four or five setae near the base of the inner 

 margin ot" the inner ramus ; margins minutely serrate. 



Telson reaching to about one-third the length of the rami of 

 the 3rd uropods, cleft for two-thirds of its length, with three or 

 four very small submarginal aud one apical spine on each 

 division. 



Length 25 mm. 



This large species appears to be nearly related to Orclio- 

 menopsis ohtusa, G. 0. Sars, from which it differs in its smaller 

 side-plates and distinctly angulated 3rd mctasome-segment. 



Genus Orchomenella, G. 0. Sars, 1895. 



O. piNGUiDES, n. sp. (PI. 8. figs. 24-30.) 



Cape Adare, Nov. 4 & 5, 1S99. Many specimens. 



Body stout : 1st segment of the mesosome longer than the 

 2nd aud about equal to the remaining segments. Pirst 4 side- 

 plates about twice as deep as the segments, the 1st narrowed, 

 the two next widened below. Third segment of the metasome 

 produced behind in a smooth-edged subquadrafe lobe ivith rounded 

 angles. First segment of the urosome with a dorsal carina. 



Head about half as long as the 1st segment : lateral angle 

 produced, sUyhtly rounded at the tip. Eyes moderately large, 

 dark, oval, expanded below. 



Upper antennae : 1st joint very stout and twice as long as the 

 next two united ; flagellum as long as the peduncle, the 1st joint 

 about three-fourths as long as the remaining fourteen; the 

 accessory appendage 5-jointed, the 1st longer than the rest 

 united. 



