No. 1609. A NEW AMPHIPOD CRUSTACEA N—STEBBING. YES 
pocket, being fitted over a broad spinose curve of the palm, between 
which and the hinge it inserts a squarish projection of its inner mar- 
gin into a corresponding depression of the palm. The second gnatho- 
pod of the female is of the usual membranaceous character, the second 
joint expanded in the proximal half, the fifth joint wider and a little 
longer than the sixth, which is rather strongly and not narrowly 
produced beyond the diminutive longitudinal finger, which lies in a 
setulose gap of the sixth joint’s front margin. In the male specimen 
from which the detail figures have been drawn one of the gnathopods 
of the second pair is decidedly smaller than the other and is without 
the transparent process on the hind margin. In another specimen, 
Fic. 1.—ORCHESTOIDEA BIOLLEYI, MALE. 
probably abnormal, the apex of the sixth joint of the second gnatho- 
pod is laterally outdrawn, obscuring its ordinary character. Only 
one member of the pair is present, and the specimen is otherwise 
defective. 
The first three pereeopods are short, the second shorter than the 
first, with its finger more strongly notched. The third pereopod has 
its second joint almost circular, much less in diameter than the length 
of the side-plate. The fourth and fifth, pereopods are very much 
longer, the fifth having its second joint much wider than that of the 
fourth pair, and its total length somewhat greater. The fingers in 
these two pairs are long and slender, in all the pairs there is an 
obliquely pointed spine in advance of the unguis. All the branchial 
