412 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



1 14578. Modiolus (Brachydontes) grammatus curtulus Dall. 



Cotypes. 

 Oligocene. Alum Bluff, Chattahoochee River, Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. IV, 1898, p. 794. 



135747. Modiolus (Brachydontes) guppyi Dall. Holotype. 



Oligocene. Bowden, Jamaica. 



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

 p. 794, pi. 35, fig. 16. 



164894. Modiolus harrimani Dall. Holotype. 



Eocene. Chichagof Cove and Peak, Alaska. 



Dall, Harriman Alaska Fxped., IV, 1904, p. 106, pi. 9, fig. 7. 



154364. Modiolus (Gregariella) minimus Dall. Holotype. 



Oligocene. Ballast Point, Tampa, Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. IV, 1898, p. 797, 

 pi. 35, fig. 26. 



153890. Modiolus pugetensis Dall. Holotype. 



Eocene. Renton coal mine, near Seattle, Washington. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. IV, 1898, p. 792, 

 pi. 35, fig. 17. 



154349. Modiolus silicatus Dall. Holotype. 



Oligocene. Ballast Point, Tampa, Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. IV, 1898, p. 793, 

 pi. 27, fig. 28. (On plate as M. tampaensis.) 



Modiolus tampaensis Dall. See M. silicatus. 



13894. Modiomorpha altiforme Walcott. Cotype. 



Middle Devonian. Done Mountain, near Eureka, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 169, pi. 5, fig. 9. 



x 4373- Modiomorpha ambigua Walcott. Holotype. 



L,ower Carboniferous. Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Surv., 1884, p. 239, pi. 20, fig. 1. 



14982. Modiomorpha (?) chemos Clarke. Holotype. 



Genesee (Dev.). Bristol, New York. 



Clarke, Bull. No. 16, U. S. Geol. Surv-., 1S85, p. 30. 



14374. Modiomorpha ? desiderata Walcott. Cotypes. 



Dower Carboniferous. Eureka District, Nevada. 



Walcott, Mon. VIII, U. S. Geol. Sun'., 1884, p. 240, pi. 20, fig. 3. 



12519. Modiomorpha ? lata Meek. Holotype. 



Upper Triassic. North Fork of Buena Vista Canyon, 

 West Humboldt Range, Nevada. 



Meek, Rept. U. S. Geol. Expl. 40th Par., IV, Pt. I, 1877, p. 103, 

 pi. 10, fig. 2. 



