146 BULLETIN 90, UNITED STATES NATIONAL MUSEUM. 



Genus MACROCALLISTA Meek. 



Macrocallista Meek, Pal. Upper Missouri, p. 179, 1876. Type, Venus 

 nimiosa Solander. — Dall, Trans. Wagner Inst., vol. 3, pt. 6, p. 1251, 

 1903. 



Section FARADIONE Dall. 



Paradione Dall, Proc Mai. See. London, vol. 8, p. 197, Apr. 1909; U. S. 



Geol. Survey, Prof, paper 59, 1909, p. 120, new name for Chionella 



Cossmann. 

 Chionella Cossmann, Cat. Illustr., bassin de Paris, vol. 1, p. 105, 1886. Type, 



Cytlierea ovalina Deshayes; not Chionella Swainson, Malac, p. 335, 



note, 1840. 



MACROCALLISTA (PARADIONE) ACUMINATA Dall. 



Plate 20, figs. 8, 9, 10 ; plate 24, figs. 2. 



Macrocallista acuminata Dall, Trans. Wagner Inst., vol. 3, pt. 6, p. 1255, 

 pi. 57, fig. 3. 1903. 



Oligocene of the Tampa silex beds, Ballast Point, Tampa Bay; 

 and of the lower bed at Alum Bluff, Chattahoochee River, Florida. 

 U. S. Nat. Mus. Nos. 165211 and 163313. 



This species resembles M. reposta Conrad, of the Miocene, but is 

 smaller, more inequilateral, and more acute behind. 



Genus CALLOCARDIA A. Adams. 



Callocardia A. Adams, Ann. Mag. Nat. Hist., ser, 3, vol. 13, p. 307, 1864; 



C. guttata Adams. 

 Caryatis Roemeb (part) Mai. Blat., vol. 9, p. 58, 1852; not Caryatis Hub- 



ner, 1816. 

 Veneriglossa Dall, Bull. Mus. Comp. Zool., vol. 12, p. 275, Sept. 1886; 



Cytherea vesica Dall. 

 Atopodonta Cossmann, Cat. Illustr. bassin de Paris, vol. 1, p. 98, Oct. 1886; 



A. coniformis Deshayes. 

 Callocardia Dall, Proc. U. S. Nat. Mus., vol. 26, No. 1312, p. 353, 1902; 



Trans. Wagner Inst., vol. 3, pt. 6, p. 1259, 1903. 



Subgenus AGEIOPOMA Dall. 



Agriopoma Dall, Proc. U. S. Nat. Mus., vol. 24, p. 509, 1902. Type, Cytherea 

 texasiana Dall, 1892 ; Trans. Wagner Inst., vol. 3, pt. 6, p. 1259, 1903. 



CALLOCARDIA (AGRIOPOMA) SINCERA Dall. 



Plate 25, fig. 7. 



Callocardia {Agriopoma) sincera Dall, Trans. Wagner Inst., vol. 3, pt. 6, 

 p. 1260, pi. 55, fig. 12, 1903. 



Oligocene of the Tampa silex beds at Ballast Point, Tampa Bay; 

 of the lower bed at Alum Bluff, Chattahoochee River; and of the 



