NORTHWEST COAST MARINE SHELLBEARING MOLLUSKS. 65 
(ANASPIDEA.) 
Family APLYSIIDAE. 
Genus TETHYS Linnaeus, 1758. 
Section NEAPLYSIA Cooper, 1863. 
TETHYS CALIFORNICA Cooper. 18G3. 
Proc. Cal. Acad. Sci., vol. .3, p. r>7, fig. 14^ , ^ 
Monterey to San Pedro, California. 'C ^ ^ 
TETHYS RITTERI Cockerell, 1901. 
Nautilus, vol. 15, p. 90. 
San Pedro, California. 
(NOTASPIDEA.) 
Family TYLODINIDAE. 
Genus TYLODINA Rafinesque, 1819. 
TYLODINA FUNGINA Gnbb. 18fi5. (Plate 15, figs. 15, 16, 17.) 
Proc. Cal. Acad. Sci., vol. 3, p. 188, 
Santa Barbara Islands, San Pedro, and San Diego, California. 
Family PLEUROBRANCHIDAE. 
Genus PLEUROBRANCHUS Cuvier, 1804. 
PLEUROBRANCHUS CALIFORNICUS Dali, 1900. 
Nautilus, vol. 14, p. 92. 
San Pedro to San Diego, California. 
PLEUROBRANCHUS DIGUETI Rochebrune, 1895. 
Bull. Mils. Hist. Nat. Paris, p. 240; Man, Conch., vol. IG, pi. 54, figs. 98, 
99, 1, 2. 
San Pedro, California, to Gulf of California. 
Order NUDIBRANCHIATA. 
(Omitted.) 
[For data on this group see Cooper nnd Stenrns in Proceedings of the Cali- 
fornia Acjidemy of Sciences; Macfm-laml in Proceedings of the Biologicnl Society 
of Washington, 1905, in the Bulletin of the United Stntes Bureau of Fisheries, 
1905, and the Nautilus, June, 1908; also Rergh in Proceedings of the Academy 
of Natural Sciences, Philadelphia, 1879-80, and other papers,] 
