864 PROCEEDINGS OF THE NATIONAL 



*t Caatalia Jianh'yana SOWERBY, Conch. Icon., XVII, 1869, pi. i, fig. 5. *P.ETEL, 



Couch. Sam., Ill, 1890, p. 18!). 

 * Castalia carolinensis SOWERBY, Conch. Icon., XVII, 1869, pi. n, iig. 6. 



* PiTEL, Conch. Saui., Ill, 1890, p. 189. 



lia cordata STROBEL, Mat. Mai., Ft, I, 1874, p. 75. 



Amazon and Rio de la Plata Itiver systems. 



tTETRAPLODON QUADRILATERUM d'Orbigny. 



r Cdstalia quadrilatera D'OKBIGNY, Gner. Mag., No. 62, 1835, p. 42. * HAXLEY, 

 Test. Moll., 1842, p. 173; *Biv. Shells, 1843, p. 173. *D'ORBIGXY, Voy. Am. 

 Mer , 1843, p. 599, pi. LXXIII. *TROSCHEL, Arch, filr Xat., XIII, 1847, Ft. 1, 

 p. 222.* vox IUEIUNG, Arch, fiir Nat., 1893, p. 89. 



* Mya ambiyua WOOD, lud. Test. Kev., 1856, p. 200, pi. i (supp.), tig. 9. 



* Castalia acuticotstallui'E, Moll. Nouv., Ill, 1857, p. 77, pi. xiv, fig. 3. * SOWERBY, 



Conch. Icon., XVII, 1869, pi. in, figs. 12, 12o, 126. * PJETEL, Conch. Sam., 

 Ill, 1890, p. 189. 



* Castalia cordata H. ami A. ADAMS, Gen. Rec. Moll., II, 1857, p. 509, pi. cxx; III, 



figs. 2, 2d. SOWERBY, Conch. Icon., XVII, 1869, pi. n, fig. 8. *P.ETEL, 

 Conch. Sani., Ill, 18CO, p. 189. 



* Castalia latiquadrataSoWEKBY, Conch. Icou.,XVII, 1869, pi. n, fig. 10. *P.tTEL, 



Conch. Sam., Ill, 1890, p. 189. 



Tropical South America east of the Andes. Perhaps a form of am- 

 biyuus. 



fTETRAPLODON OVATUS Sowerby. 



* Castalia ovata SOWERBY, Couch. Icon., XVII, 1869, pi. i, fig. 4. *P.ETEL, Couch 



Sam., Ill, 1890, p. 189. 



Brazil. 



tTETRAPLODON RETUSUS Hupe. 



* Castalia ambigua SOWERBY, Conch. Man., 1839, fig. 140. 



* Castalia retusa HUPE, Moll. Nouv., Ill, 1857, p. 75, pi. xiv, fig. 2. "SOWERBY, 



Conch. Icon., XVII, 1869, pi. i, fig. 2. * P.ETEL, Conch. Sam., Ill, 1890, p. 189. 



Guiana. 



TETRAPLODON QUADRATUS Sowerby. 



* Caatalia quadrata SOWERBY, Conch. Icon., XVII, 1867, pi. n, figs. 7, la, 76. 



"P.ETKI., Conch. Sam., Ill, 1890, p. 189. 



TETRAPLODON SCHOMBERGIANUS Sowerby. 



* Castalia schombergiana SOWERBY, Couch. Icon., XVII, 1869, pi. xiv, fig. 3. 



* P.ETEL, Conch. Sam., Ill, 1890, p. 189. 



Guiana. 



(Group of Tetraplodon multisulcatus.) 



Shell small, somewhat compressed, with a moderate posterior ridge, 

 and covered throughout with delicate ridges 5 teeth more Uiiiouoid than 

 in the typical Tetraplodous. 



Animal unknown. 



