520 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



46279. Plethocardia umbonata Ulricli. Holotype. 



Black River (Ord.). Six miles south of Cannon Falls, 

 Minnesota. 



Ulrich, Nineteenth Ann. Rept. Geol. and Nat. Hist. vSurv. Miuu., 

 1892, p. 244, fig. 28; Geol. and Nat. Hist. Surv. Minn., Final 

 Rept., Ill, rt. II, 1894, p. 576, pi. 40, figs. 22-24. 



28137. Plethospira cassina Whitfield. Plesiotype. 



Beekmantown (Ord.). Fort Cassin, Vermont. 



Ulrich, Geol. and Nat. Hist. vSnrv. Minn., Final Rept., Ill, Pt. II, 

 1897, p. 1009, fig. 7a. 



45956. Plethospira semele (Hall). Plesiotype. 



Utica (Ord.). Graf, Iowa. 



Ulrich and Scofield, Geol. and Nat. Hist. Surv. Minn., Final 

 Rept., Ill, Ft. II, 1897, p. loio, pi. 70, fig. 8. 



45957. Plethospira striata Ulrich. Holotype. 



Richmond (Ord.). Hanover, Butler County, Ohio. 



Ulrich, Geol. and Nat. Hist. Surv. Minn., Final Rept., Ill, Pt. II, 

 1S97, p. loii, pi. 70, fig. 7. 



163460. Pleurodesma floridana Dall. • Holotype. 



Pliocene. Shell Creek, De Soto County, Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. VI, 1903, pi. 57, 

 fig- 30- 



107689. Pleurodon woodii Dall. Holotype. 



Pliocene. Caloosahatchie River, near Fort Thompson, 

 Florida. 



Dall, Trans. Wagner F'ree Inst. Sci. Phila., Ill, Pt. IV, 1898, p. 600, 

 pi. 24, fig. ID. 



115718. Pleurodonte bowdeniana vSimpson. Cotypes. 



115719. Miocene. Bowden, St. Thomas, Jamaica, West Indies. 



Dall, Proc. U. S. Nat. Mus., XVII, 1894, p. 450, pi. 16, figs. 3-5. 



12336. Pleuromya newtoni Whitfield. Cotypes. 



Jura.ssic. Two miles south of Belle Fourche River, near 

 Bear I^odge Butte, Black Hills, South Dakota. 



Whitfield, Rept. Geol. and Resources Black Hills Dakota, 1880, 

 p. 367, pi. 5, figs. 19, 20. 



28958 Pleuromya subcompressa (Meek). Plesiotj^pes. 



to Jura.ssic. Yellowstone National Park. 



2^9^^^- vStanton, Mon. XXXII, Pt. II, U. S. Geol. vSurv., 1899, p. 626, pi. 



74, figs. 8-1 1. 



27140. Pleurophorella papillosa Girty. Holotype and paratype. 



Cisco (Upper Carb.). Graham, Young County, Texas. 



Girty, Proc. U. S. Nat. Mus., XXVII, 1904, p. 729, pi. 45, figs. 

 4-6; pi. 46, fig. 5. 



