60 
BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 
Family PNEUMODERM ATIDAE. 
Genus PNEUMODERMA Peron and Lesueur, 1810. 
PNEUMODERMA PACIFICA Dali, 1871. 
Amer. Journ. Conch., vol. 7, p. 139, Challenger Pteropoda, pi. 2, figs. 4, 5. 
Northeast Pacific, off the California coast in latitude 37° and northward to 
latitude 45° 
Family DESMOPTERIDAE. 
Genus DESMOPTERUS Chun, 1889. 
DESMOPTERUS PACIFICUS Essenberg, 1919. 
Univ. of Cal. Pub. Zool., vol. 19, No. 2, p. 85, figs. 1, 2. 
Off Southern California. 
Order OPISTHOBRANCHIATA. 
Suborder Tectibranchiata. 
■ (CEPHALASPIDEA.) 
Family ACTEONIDAE. 
Genus ACTEON Montfort, 1810. 
ACTEON TRASKI Stearns, 1898. 
Proc. U. S. Nat. Mus., vol. 21, No. 1145, p. 298, fig. 1. 
San Diego, California, to Pananra. Also Pleistocene. 
Subgenus Rictaxis Dali, 1871. “ 
RICTAXIS PUNCTOCOELATA Carpenter, 1864. 
Suppl. Rep. Brit. Assoc., p. 646; Amer. Journ. Conch., vol. 7, pi. 15, fig. 12. 
Monterey, California, to Magdalena Bay, Lower California. 
RICTAXIS PAINEI Dali, 1903. (Plate 3, fig. 5.) 
Proc. Biol. Soc. Wash., vol. 16, p. 172. 
Catalina Island, California, in 50 fathoms. 
Genus MICROGLYPHIS Dali, 1902. 
MICROGLYPHIS BREVICULUS Dali, 1902. 
Proc. U. S. Nat. Mus., vol. 24, No. 1264, p. 512 ; Bull. Mus. Comp. Zool., vol. 
43, pi. 15, fig. 12. 
Monterey, California, to Point San Quen'tin, Lower California. 
MICROGLYPHIS ESTUARINUS Dali, 1908. 
Bull. Mus. Comp. Zool., vol. 43, No. 6. p. 238. 
Straits of Puca to Gulf of California. 
