772 



TEXTBOOK OF ZOOLOGY 



Fig. 407. — Peropliora, a common tunicate which rangres from British Columbia 

 to San Diego along the Pacific Coast. Notice siphons, digestive tract (black), and 

 gill slits in wall of pharynx. (Courtesy of Albert E. Galigher, Inc.) 



PAGURUS 



LIBINIA 



Fig. 408. — ^Representative crabs. Vca (fiddler), CalUnectes (blue edible), 

 Pagurus (hermit), Libinia (spider). Abundant on shores of Gulf of Mexico. 

 (Courtesy of General Biological Supply House.) 



