NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 865 



TETRAPLODON MULTISULCATUS Hupe. 



* Castalia ambigua Blainville, Mau., 1825, p. 539, pi. lxvii, fig. 4. 



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



ERBY, Concli. Icon., XVII, 1869, pi. ii, figs. 9, 9a, 96. — *PiETEL, C'oncli. 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^tel, Conch. Sam., Ill, 1890, 

 p. 189. 



Puerto Nuevo, Magdaleua Eiver, Colombia. 



TETRAPLODON CROSSEANUS Hidalgo. 



* Castalia crosseana Hidalgo, Jl. de Couch., XIII, 1865, pp. 316, 429, pi. xiv, fig. 



2.—* PiETEL, Conch. Sam., Ill, 1890, p. 189. 



Imbabura, Ecuador. 



Genus CASTALINA Von Ihering, 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 subtrancate 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 pseiidocardinals 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 Ihering.) 



(Group of Castalina onartensi.) 

 Characters as in the genus. 



t CASTALINA MARTENSI von Ihering. 



* Castalina mariewsi voN Ihering, Zool. Anz., XIV, 1891, p. 477; Arch, fiir Nat., 



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



Southern Brazil. 



t CASTALINA NEHRINGI von Ihering. 



Castalina nehringi voN Ihering, Zool. Anz., XIV, 1891, p. 477; * Arch, fiir 

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



Southern Brazil. 



Proc. N. M. vol. xxii 55 



