EXPLANATION OF PLATE IX. 
Periscyphis gigas, ni. sp. 
Fic. z.—Dorsal view, X 23. 
2.—Dorsal view of the cephalon. 
,»  3-—Anterior view of the cephalon. 
4.--Antennule. 
5.—Right mandible. 
6.—Outer lobe of Ist maxilla. 
7,—Second maxilla, 
8.—Maxillipede. 
g.—Second thoracic appendage. 
ga.—Terminal portion of spine, much enlarged. 
1o.—Left uropod. 
