AKT. 17 ILLUSTRATIONS OF TYPES OF SHELLS DALL 15 



Dredged by the United States Bureau of Fisheries steamer Alba- 

 tross at station 3700, off Honshu Island, Japan, in 63 fathoms, 

 volcanic sand. 



This has the form of some of the Murices but the surface texture 

 of C oralliophila, and its umbilical pit. 



CORBICULA (CYRENODONAX) FORMOSANA Dall 



Plate 29, fig. 3 



CorMcula {Cyrenodonnx) formosana Dall, Trans. Wagner Inst. ScJ. Pliila., 

 vol. 3, p. 1450, footnote, 1903. 

 Mouth of Tamsui River, Formosa. U. S. Nat. Mus. Cat. No. 47964. 



CORBICULA (CYANOCYCLAS) OLEANA Marshall 



Plate 35, fig. 2 * 



Corbicnla (Cyanocyclas) oleana Marshall, Proc. U. S. Nat. Mus., vol. 66, No. 

 2552, p. 8, Nov. 3, 1924. 

 Collected by Don Severiano de Olea at the Arroyo de Malvin, Department 

 of Montevideo, Uruguay. U. S. Nat. Mus. Cat. No. 109261. 



Height of shell, 14; breadth, 13; diameter, 9 mm. 



CORBULA MACDONALDI Dall 



Plate 17, figs. 1, 3 



Corbula niacdonaldi Dall, Smithsonian Misc. Coll., vol. 59, No. 2, p. 3, Mar., 

 1912. 

 Pleistocene of the Canal Zone, Panama. U. S. Nat. Mus. Cat. No. 214358. 



CRENELLA COLUMBIANA Dall 



Plate 9, fig. 1 



Vrenella colimibiana Dall, Bull. Nat. Hist. Soc. Brit. Col., No. 2, p. 4, 1897. 

 Nazau Bay, Atka Island, Aleutians, in 12 fathoms. U. S. Nat. Mus. Cat. 

 No. 107641. A young shell. 



CRYPTOMYA MAGNA Dall 



Plate 13, figs. 3, 4 



Cryptomya magna Dall, West Amer. Scientist, vol. 19, No. 2, p. 17, 1921. 



Pliocene (?) of San Quentin Bay, Lower California. U. S. Nat. Mus. Cat. No. 

 333127. 



CUMINGIA DENSILINEATA Dall 



Plate S, fig. 5, plate 11, fig. 2 



Cumingia densiUneata Dall, West Amer. Scientist, vol. 19, No. 3, p. 22, 1921. 

 Pliocene (?) of San Quentin Bay, Lower California. U. S. Nat. Mus. Cat. No. 

 333115. 



CUSPIDARIA GLACIALIS Sars 



Plate 20, fig. 4 



Neaera glacialis G. O. Sahs, Moll. Reg. Arct. Norv., p. 88, 1878. 



Off San Diego, Calif., in deep water. U. S. Nat. Mus. Cat. No. 122587. 

 20001—25 3 



