no. 1586. NEW ISOPODS FROM THE PACIFIC OCEAN— RICHARDSON. 693 



having the first abdominal segment indicated by incisions in the lat- 

 eral margins. It also has the anterior part of the body more strongly 

 convex and not so depressed as in H. giardi. 



One male accompanies the specimen from Santa Barbara Channel. 



Description of male. — The male is about three times longer than 

 wide, being 2 mm. in width and 6 mjn. in length. The head is very 



Fig. 4.— Holophryxus californiensis. Adult Female and Host. 



large, rounded in front and completely fused with the first thoracic 

 segment- There are no eyes. The first pair of antenna? are small and 

 composed of only a few articles. The second pair of antennae are 

 rather long, extending to the posterior margin of the head, and are 

 composed of about seven articles. The antennas are inconspicuous 

 from a dorsal view. 



