178 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



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



Cotypes. 

 Middle Cambrian. Canyon above Calls Fort, Wasatch 

 Range, Utah. 



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

 1877, p. 238, pi. 2, figs. n-13. 



= Ptychoparia quadrans. 



24575. Crepicephalus (Loganellus) simulator Hall and Whitfield. 



Cotypes. 

 "Upper Cambrian. Eureka, Nevada. 



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

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



= Ptychoparia ? simulator. 



See Crepicephalus (Loganellus) granulosus. 



35232. Crepicephalus texanus (Shumard). Plesiotype. 



Middle Cambrian. Coosa Valley, Alabama. 



Walcott, Mon. XXXII, Pt. II, U. S. Geol. Surv., 1899, p. 460, pi. 

 65, fig- 5- 



24574. Crepicephalus ( Loganellus ) unisulcatus Hall and Whit- 

 field. Cotypes. 

 Upper Cambrian. Eureka, Nevada. 



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

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



— Ptychoparia ? unisulcata. 



163532. Crepidula aesop Dall. Holotype. 



Pliocene. Shell Creek, Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. VI, 1903, pi. 

 55, figs. 6, 7. 



3496. Crepidula praerupta Conrad. Holotype. 



3564. Miocene. Astoria, Oregon. 



Conrad, Wilkes U. S. Expl. Exped., X, 1849, p. 727, Atlas, pi. 19, 

 figs. 9a, 10a, b. 



164900. Crepidula precursor Dall. Holotype. 



Eocene. Chichagof Cove, Alaska. 



Dall, Harriman Alaska Exped., IV, 1904, p. no, pi. 9, fig. 3. 



1S39. Crepidula princeps Conrad. Holotype. 



Post-tertiary. Santa Barbara, California. 



Conrad, Rept. Expl. and Surv. R. R. Miss. Riv. to Pacific Ocean, 



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

 [Probably the same as Crepidula praerupta Conrad. W. H. Dall.] 



164918. Crepidula ungana Dall. Cotypes. 



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



Dall, Harriman Alaska Exped., IV, 1904, p. 119, pi. 10, figs. 8, 9. 



