438 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



3635. Nucula concinna Daua. Holotype. 



Carboniferous. Harpers Hill on the Hunter, New South 

 Wales, Australia. 



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

 fig. 4- 



1 0740 1. Nucula ( Acila) cordata Dall. Holotype. 



Miocene. Near Mist, Columbia Count}', Oregon. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. IV, 1S9S, 

 !>• 573. pl- 40. fig. 4- 



107402. Nucula (Acila) decisa (Conrad). Plesiotj^pes. 



Eocene. Pittsburg, Oregon. 



Ball, Trans. Wagner PVee Inst. Sci. Phila., Ill, Pt. IV, 1898, 

 p. 573, pi. 40, figs. I, 3. 



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



Eocene. Chicagof Cove, Alaska. 



Dall, Harriman Alaska Exped., IV, 1904, p. 105, pi. 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 Ha5'den. Holotype and parat5'pes. 

 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 Lowerys, 

 Tehama County, California. 



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

 pi. 6, figs. II, 12. 



3490. Nucula impressa Conrad. Cotypes. 



3491. Miocene. Astoria, Oregon. 



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

 figs. 7c-e. 



14376. Nucula insularis Walcott. Cotype. 



Eower Carboniferous. Eureka District, Nevada. 



Walcott, Mon. VIII, U. vS. Geol. vSurv., 1884, p. 241, pi. 20, fig. 14. 



24333. Nucula kayseri Clarke. Holotype. 



Middle Devonian. Erere, Brazil. 



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

 figs. 1,2. 



14379. Nucula levatiforme Walcott. Cotype. 



Lower Carboniferous. P^ureka District, Nevada. 



Walcott, Mon. VHI, U. S. Geol. Surv., 1884, p. 241, pi. 22, 

 figs. I, I a. 



