NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON. 865 



TETRAPLODON MULTISULCATUS Hupe. 



* Castalia ambigua BLAINVILLE, Mail., 1825, p. 539, pi. i-xvn, fig. 4. 



* Castalia multisulcata HUPE, Moll. Nouv., Ill, 1857, p. 75, pi. xiv, fig. 4. *Sow- 



KRBY, Conch. Icon., XVII, 1869, pi. n, figs. 9, 9a, 96. *PJKTEL,, Conch. Sam., 

 Ill, 1890, p. 189. 



Brazil. 



TETRAPLODON ECARINATUS Mousson. 



* Castalia ecarinata MOUSSON, Mai. Bl., XVI, 1869, p. 185. *PFEIFFER, Nov. 



Conch., IV, 1876, p. 140, pi. cxxxi, figs. 9, 10.* P^ETEL, Conch. Sam., Ill, 1890, 

 p. 189. 



Puerto ISTuevo, Magdalena River, Colombia. 



TETRAPLODON CROSSEANUS Hidalgo. 



* Castalia crosseana HIDALGO, Jl. de Conch., XIII, 1865, pp. 316, 429, pi. xiv, fig. 



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



Iinbabura, Ecuador. 



Genus CASTALINA Von Thering, 1891. 

 Castalina VON IHERING, Zool. Anzeiger, 1891, p. 478. 



Shell somewhat triangular, inflated, but having the sides a little flat- 

 tened, solid, with a strong posterior ridge, the subtruncate posterior 

 slope rising almost to a wing above; beaks full, high, with nearly 

 strictly radial sculpture; surface slightly, irregularly, concentrically 

 sulcate, sometimes a little corrugated ; posterior slope generally plicate 

 or corrugated; epidermis thick, rayless, blackish; hinge plate arched, 

 wide; two to several radial pseudocardinals in each valve; two verti- 

 cally or obliquely striate laterals in the left valve and one in the right; 

 beak cavities deep; anterior muscle scars deep, united; nacre whitish. 



Animal, probably very much like that of Tetraplodon, but with the 

 mantle closed or open at the branchial and anal openings. 



(Type, Castalina martensi von Iheriug.) 



(Group of Castalina martentsi.) 

 Characters as in the genus. 



t CASTALINA MARTENSI von Ihering. 



* Castalina martensi VON IHERING, Zool. Anz., XIV, 1891, p. 477 ; Arch, fiir Nat., 



1893, p. 81, pi. in, fig. 5. 



Southern Brazil. 



t CASTALINA NEHRINGI von Ihering. 



Castalina nehringi VON IHERING, Zool. Anz., XIV, 1891, p. 477 ; * Arch, fur 

 Nat., 1893, p, 75, pi. in, fig. 4. 



Southern Brazil. 



Proc. N. M. vol. xxii 55 



