46 PHYLLIDIID^. 



Genus FRYERIA, Gray. 



Body depressed, oval. Labial appendages small, distinct, 

 slender. Mantle hard, convex, tubercular. Vent in the 

 middle of the hinder part, in the groove between the mantle 

 and the foot. 



Ex. P. pustulosa, Mitppell, pi. 08, fig. 5, 5, a. 



In Fryeria the vent occupies a different position to that 

 of Phyllidia, not being median and dorsal as in that genus, 

 and the surface of the mantle is tubercular. 



Genus HYPOBKANCHLEA, A. Adams. 



Body ovate, depressed. Tentacles clavate, dorsal, ? non- 

 retractile. Mantle broad, extending beyond the foot, the 

 margin thin and flexuous ; gills under the mantle-margin at 

 the hind part. Vent posterior, in the groove between the 

 mantle and foot. 



Ex. H. fusca, A. Adams, pi. 68, fig. 6. 



This remarkable animal was discovered by one of the 

 Authors in the shallow pools left by the receding tide on the 

 shore of Koo-Kieng-San, one of the Meiacoshimah Islands, 

 in the Yellow Sea. The upper surface of the mantle was 

 of a sandy colour, the central part of a darker hue, with 

 oblong blotches of a dark brown colour ; it was in length 

 about six inches, and in breadth about two and a half. It 

 crawled upon its flattened ventral disk in a slow and languid 

 manner; and when thrown into deeper water floated by 

 undulating the thin edges of the mantle, and gradually 

 sunk to the bottom. 



