GO BULLETIN 112, UNITED STATES NATIONAL MUSEUM. 



Family PNEUMODERMATIDAE. 

 Genus PNEUMODERMA Peron and Lesueur, 1810. 



PNEUMODERMA PACIFICA Dall, 1871. 



Amer. Journ. Conch., vol. 7, p. 139, Challenger Pteropuda, 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 Panama. Also Pleistocene. 



Subgenus Rictaxis Dall, 1871. 



RICTAXIS PUNCTOCOELATA Carpenter, 1864. 



Suppl. Rep. Brit. Assoc, p. 646; Amer. Journ. Conch., vol. 7. pi. 15, figi V2. 

 Monterey, California, to Magdalena Ray, Lower California. 



RICTAXIS PAINEI Dall, 1903. (Plate 3, fig. 5.) 



Proc. Biol. Soc. Wash., vol. 16, p. 172. 

 Catalina Island, California, in 50 fathoms. 



Genus MICROGLYPHIS Dall, 1902. 



MICROGLYPHIS BREVICULUS Dall. 1902. 



Proc. U. S. Nat. Mus., vol. 24, No. 1264, p. 512: Bull. Mus. Conip. Zool., vol. 



43, pi. 15. fig. 12. 

 Monterey, California, to Point San Quentin, Lower California. 



MICROGLYPHIS ESTUARINUS Dall, 1908. 



Bull. Mus. Comp. Zool., vol. 43, No. 6. p. 238. 

 Straits of Fuca to Gulf of California. 



