NORTHWEST COAST MARINE SHELL.BEARTNG MOLLUSKS. 65 



(ANASPIDEA.) 

 . Family APLYSIIDAE. 



Genus TETHYS Linnaeus, 1758. 

 Section NEAPLYSIA Cooper, 18G3. 



TETHYS CALIFORNICA Cooper, 1863. 



Proc. Cal. Acad. Sci., vol. 3, p. 57, fig. 14. 

 Monterey to San Pedro, California. 



TETHYS RITTERI Cockerell, 1901. 

 Nautilus, vol. 15, p. 90. 

 San Pedro, California. 



(NOTASPIDEA.) 



Family TYLODINIDAE. 



Genus TYLODINA Rafinesque, 1819. 



TYLODINA FUNGINA Gabb. 1865. (Plate 15, figs. 15, 16, 17.) 



Proe. Cal. Acad. Sci., vol. 3, p. 188. 



Santa Barbara Islands, San Pedro, and San Diego. California. 



Family PLEUROBRANCHIDAE. 



Genus PLEUROBRANCHUS Cuvier, 1804. 



PLEUROBRANCHUS CALIFORNICUS Dall, 1900. 

 Nautilus, vol. 14, p. 92. 

 San Pedro to San Diego, California. 



PLEUROBRANCHUS DIGUETI Rochebrnne, 1895. 



Bull. Mus. Hist. Nat. Paris, p. 240; Man. Conch., vol. 16, pi. 54, figs. 98, 



99, 1, 2. 

 San Pedro, California, to Gulf of California. 



Order NUDIBRANCHIATA. 



(Omitted.) 



[For data on this group see Cooper and Steams in Proceedings of the Cali- 

 fornia Academy of Sciences; Macfarland in Proceedings of the Biological Society 

 of Washington, 1905, in the Bulletin of the United States Bureau of Fisheries, 

 1905, and the Nautilus, June, 1908; also Bergh in Proceedings of the Academy 

 of Natural Sciences, Philadelphia, 1S79-S0, and other papers.] 



