NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 577 



LAMPSILIS LARGILLIERTI Philippi. 

 "'Unio largiUierti Philippi, Zeits. fiir Mai., IV, 1847, p. 94.' 

 Yucatan. 

 The followiog are unflgured and unknown to me: 



* Lampsilis fasciola Kafinesque, Aim. Gen. Sci. Brux., V, 1820, p. 299. 



* Lamp siUs fulg ens Eafinesque, Cont. Monog., 1831, p. 7. 



* Lampsilis argyratus Eafinesque, Cont. Monog., 1831, p. 7. 



Genus PSEUDOSPATHA Simpson, 1900. 

 (Type, Spatha tangani/icensis Smith. )- 

 Burtonia Bourginguat, Moll. Fluv. Nyanza, 1883, p. 20.'' 



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 biangulate 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. 



* Spatha tanganyicensis Smith, Proc. Zool. See. Lond., 1880, p. 350, pi. xxxi, fig. 8. 

 ^Burtonia tang any icin sis P/Etel, Conch.. Sam., Ill, 1890, p. 187. — voN Martens, 



Beschalte, 1897, p. 257. 



* Burtonia moineti'QovTRGViG'SA.T, Uu. and Ir. 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 Bourguignat, Un. and Ir. Tan., 1886, p. 41 ; Icon. Mai. Tan., 



]8>'8, pl.xxvi, figs. 1-2. 



Lakes Tanganyika and Nyanza, Africa. 



PSEUDOSPATHA LEOPOLDVILLENSIS Putzeys. 



Burtonia leopoldvUlensis Putzeys, Proc. Verb. Soc. Mai. Belg., 1898, pi. xxviii,, 

 fig. 16. 



Leopoldville, Congo. 



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

 belonged here, but it may not. 



"The shells of this group bear a striking likeness to that of Unio tenuissimus 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. delpliinnliis of Central America. 



^Name preoccupied in birds, 1850. 



Proc. ]Sr. M. vol. xxii 37 



