NO. 1205. SYNOPSIS OF THE NAIADES SIMPSON. 577 



LAMPSILIS LARGILLIERTI Philippi. 



* Unio largillierti PHILIPPI, Zeits. fiir Mai., IV, 1847, p. 94.' 



Yucatan. 



The following are unfigured and unknown to me: 



* Lampsilis fasclola RAFINESQUE, Ann. Gen. Sci. Brux., V, 1820, p. 299. 



* Lampsilis fulyens RAFINESQUE, Cont. Monog., 1831, p. 7. 



* Lampailis argyratus RAFINESQUE, Cont. Monog., 1831, p. 7. 



Genus PSEUDOSPATHA Simpson, 19OO. 



(Type, Spatha tanganyicensis Smith.) 2 

 Burtonia BOURGINGUAT, Moll. Fluv. Nyanza, 1883, p. 20. :i 



Shell compressed, thin, oblique, inequilateral, with a straight dorsal 

 line which ends in a small wing in front and behind, rounded and cut 

 away at the anterior base, produced in the post basal region, gaping in 

 front and behind, slightly twisted on its axis and usually bent poste- 

 riorly to the right or left: a low, often double posterior ridge ends in 

 a biangulute point behind ; beaks compressed, the sculpture faint, irregu- 

 lar, concentric ridges which continue over the shell, and at the beaks 

 sometimes become rather sharply pustulous, the glochidium often 

 remaining; epidermis yellowish brown, sometimes delicately rayed; 

 teeth rudimentary, one or more faint compressed pseudocardinals and a 

 single lateral in each valve; muscle scars irregular; nacre coppery or 

 purple, often rayed. Animal unknown. 



* PSEUDOSPATHA TANGANYICENSIS Smith. 



* Spatna tanganyicensis SMITH, Proc. Zool. Soc. Lond., 1880, p. 350, pi. xxxi, fig. 8. 



* Burtonia tanganyicinsis P/ETEL, Conch. Sam., Ill, 1890, p. 187. VON MARTENS, 



Beschalte, 1897, p. 257. 



* Burtonia moineii BOURGUIGXAT, Uu. and lr. Tan., 1886, p. 33; Icon. Mai. Tan., 



1888, pi. xxv, fig. 1. 



* Burtonia lavigerina BOURGUIGNAT, Un. and Ir. Tan., 1886. p. 36; Icon., Mai. Tan., 



1888, pi. xxiv, figs. 1-4. 



* Burtonia magnifica BOURGUIGXAT, L'n. and Ir. Tan., 1886, p. 41 ; Icon. Mai. Tan., 



18-8, pi. xxvi, figs. 1-2. 



Lakes Tanganyika and Nyanza, Africa. 



PSEUDOSPATHA LEOPOLDVILLENSIS Putzeys. 



Burtonia leopoldvillensis PUTZEYS, Proc. Verb. Soc. Mai. Belg., 1898, pi. xxvm., 

 fig. 16. 



Leopoldville, Congo. 



1 Unfigured and unknown to me. From the description I should think likely it 

 belonged here, but it may not. 



2 The shells of this group bear a striking likeness to that of Unio tenuissimiis Lea, 

 in form, texture, color, teeth, and in gaping in front and behind, and I am inclined 

 to believe that they are related to it, and the Unio myersianus of Southeastern Asia, 

 to Unio alatus, and U. delpkinnlns of Central America. 



3 Name preoccupied in birds, 1850. 

 Proc. N". M. vol. xxii 37 



