438 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



3635. Nucula concinna Dana. Holotype. 



Carboniferous. Harpers Hill on the Hunter, New South 

 Wales, Australia. 



Dana, Wilkes U. S. Bxpl. Exped., X, 1849, p. 699, Atlas, pi. 7, 

 fig. 4. 



1 07401. Nucula (Acila) cordata Dall. Holotype. 



Miocene. Near Mist, Columbia County, Oregon. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. IV, 1898, 

 P- 573, pl- 4o, fig. 4- 



107402. Nucula (Acila) decisa (Conrad). Plesiotypes. 



Eocene. Pittsburg, Oregon. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. IV, 1898, 

 p. 573, pl. 40, figs. 1, 3. 



164887. Nucula (Acila) decisa (Conrad). Plesiotype. 



Eocene. Chicagof Cove, Alaska. 



Dall, Harriman Alaska Exped., IV, 1904, p. 105, pl. 9, fig. 2. 



323. Nucula equilateralis Meek and Hayden. Holotype. 



Fort Pierre (Cret.). Moreau River, South Dakota. 



Meek and Hayden, Proc. Acad. Nat. Sci. Phila., VIII, 1856, p. 84. 



= Nuculana? equilateralis. 



307. Nucula evansi Meek and Hayden. Holotype and paratypes. 

 Fox Hills (Cret.). Moreau River, South Dakota. 



Meek and Hayden, Proc. Acad. Nat. Sci. Phila., VIII, 1856, p. 84. 

 = Yoldia evansi. 



23047. Nucula gabbi Stanton. Holotype. 



Knoxville (Lower Cret.). Three miles south of L,owerys, 

 Tehama County, California. 



Stanton, Bull. No. 133, U. S. Geol. Surv., 1895 (Feb., 1896), p. 51, 

 pl. 6, figs. 11, 12. 



3490. Nucula impressa Conrad. Cotypes. 



3491. Miocene. Astoria, Oregon. 



Conrad, Wilkes U. S. Expl. Exped., X, 1849, p. 726, Atlas, pl. 18, 

 figs. 7c-e. 



14376. Nucula insularis Walcott. Cotype. 



Eower Carboniferous. Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 241, pl. 20, fig. 14. 



24333. Nucula kayseri Clarke. Holotype. 



Middle Devonian. Erere, Brazil. 



Clarke, Archivos do Mus. Rio de Janeiro, X, 1899, p. 70, pl. 8, 

 figs. 1, 2. 



14379. Nucula levatiforme Walcott. Cotype. 



Eower Carboniferous. Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 241, pl. 22, 

 figs. 1, ia. 



