178 BULLETIN r).!, TTNITED STATES NATIONAL MUSEUM. 



15432. Crepicephalus ? ( Loganellus) quadrans Hall and Whitfield. 



Cotypes. 

 Middle Cambrian. Canj'on above Calls Fort, Wasatch 

 Range, Utah. 



Hall and Whitfield, Kept. U. vS. Geol. Expl. 40th Par., IV, Pt. II, 



KS77, p. 23.S, pi. 2, figs. 11-13. 



= Ptychoparia quadrans. 



24575. Crepicephalus (Loganellus) simulator Hall and Whitfield. 



Cotypes. 

 Upper Cambrian. Eureka, Nevada. 



Hall and Whitfield, Rept. U. vS. Geol. Expl. 40th Par., IV, Pt. II, 

 1877, p. 218, pi. 2, figs. 16-18. 



= Ptychoparia ? simulator. 



See Crepicephalus (Loganellus) granulosus. 



35232. Crepicephalus texanus TShumard). Plcsiotype. 



Middle Cambrian. Coosa Valley, Alabama. 



Walcott, Mon. XXXII, Pt. II, U. vS. Geol. vSurv., 1899, p. 460, pi. 

 65. fiR- 5- 



24574. Crepicephalus ( Loganellus ) unisulcatus Hall and Whit- 

 field. Cotypes. 

 Upper Cambrian. Eureka, Nevada. 



Hall and Whitfield, Rept. U. S. Geol. Expl. 4uth Par., IV, Pt. II, 

 1877, p. 216, pi. 2, figs. 22, 23. 



— Ptychoparia ? unisulcata. 



163532. Crepidula aesop Dall. Holotype. 



Pliocene. vShell Creek, Florida. 



Dall, Trans. Wagner Free Inst. vSci. Pliila., Ill, Pt. \'I, 1903, pi. 

 55, figs. 6, 7. 



3496. Crepidula prserupta Conrad. Holotype. 



3564. Miocene. Astoria, Oregon. 



Conrad, Wilkes V. .S. P'xpl. Exped., X, 1849, p. 727, Atlas, pi. 19, 

 figs. 9a, loa, 1). 



164900. Crepidula precursor Dall. Holotype. 



I-vocene. Chichagof Cove, Alaska. 



Dall, Harrinian .Alaska Exped., IV, 1904, p. 1 10, pi. 9, fig. 3. 



1S39. Crepidula princeps Conrad. Holotype. 



Post-tertiary. vSanta Barbara, California. 



Conrad, Re])t. I{x])l. and Surw R. R. Miss. Riv. to Pacific Ocean, 



V, 1856, p. 326, pi. 6, figs. 52, 52a. 

 [Probably the same as Crepidnla priernpta Conrad. W. II. Dall.] 



1 649 1 8. Crepidula ungana Dall. Cotypes. 



Miocene. Coal Bluff, Unga Lsland, Shumagins, Alaska. 



Dall, Harritnan .\laska b^xpcd., W , 1904, p. 119, j)l. 10, figs. 8,9. 



