NO. 1205. SYNOPSIS OF THE XAIADES SIMPSOX. (J57 



tSOLENAIA IRIDINEA Heude. 



f .Vycetopu8iridir>cu8 HEUDE, Jl. de Conch., XXII, 1874, p. 117; Conch. Fluv. Nauk., 

 I, 1875, pi. vin, fig. 19. * F.ISCHEH, Jl.de Conch., XXXVIII, 1890, p. 11. 



* P.ETEL, Conch. Sam., Ill, 1890, p. 187. 



*Mycetopm similia HEUDE, Conch. Fluv. Xauk., Ill, 1877, pi. xxm, fig. 50. 



* FISCHER, Jl. de Conch., XXXVIII, 1890, p. 11. * P.ETEL, Conch. Sam., Ill, 

 1890, p. 187. 



China. 



SOLENAIA RIVULARIS Heude. 



*31ycetop><8 rh-ularis HEUDE, Couch. Fluv. Nank., Ill, 1877, pi. xxm, fig. 49. 



* FISCHER, Jl. de Conch., XXXVIII, 1890, p. 11. 

 China. 



SOLENAIA CARINATA Heude. 1 



*Mycetopns carinatus HEUDE, Conch. Fluv. Nank., Ill, 1877, pi. xxi, fig. 45. 

 '* FISCHER, Jl. de Conch., XXXVIII, 1890, p. 11. * P.ETEL, Conch. Sam. ,111, 

 1890, p. 186. 



China. 



SOLENAIA RUGATA Sowerby. 



*Mycetopit8 rugatus SOWERBY, Conch. Icon., XVI, 1868, pi. in, fig. 7. * SMJTH, Jl. 



de Conch., XXII, 1874, pi. iv, fig. 1.* CLESSIN, Conch. Cab. Auo., 1876, p. 205, 



pi. LXVII, fig. 4. * P.ETEL, Couch. Sam., Ill, 1890, p. 187. 

 *Platiris (Mycetopus) rugatus LEA, Syn., 1870, p. 90. 



Said to come from Victoria Kiver, Australia. I am a little in doubt 

 about the locality. 



(Group of Solenaia triangular is.} 

 Shell short, rounded on post base; very narrow in front. 



SOLENAIA TRIANGULARIS Heude. 



'Myceiopus triangularis HEUDE, Conch. Fluv. Nank., IX, 1885, pi. LXXII, fig. 138. 



* FISHER, Jl. de Couch., XXXVIII, 1890, p. 11.* P^ETEL, Conch. Sam., Ill, 

 1890, p. 187. 



China. 



Genus GONIDEA Conrad, 18S7. 



(Type, Anodonta randaUi Trask, and Anodonta feminalis Gould.) 

 Gonidea CONRAD, Pr. Ac. Nat. Sci. Phila., 1, 1857, p. 165. 



Shell elongated, subtriangular, much narrowed in front, wide behind, 

 inflated, subsolid, usually with a high, sharp, posterior ridge; beaks 

 rather sharp but not high, the sculpture consisting of a few, strong, 

 concentric bars; epidermis rayless; hinge with a rudimentary pseudo- 

 cardinal and lateral in each valve, though these are sometimes wanting; 

 dorsal scars forming a row within the shallow beak cavity; muscle 

 scars irregular; palleal line with a trace of a sinus behind; nacre lurid 

 to purplish. 



'The type and only kuowu shell is a fossil fragment. It may be a recent species. 

 Proc. N". M. vol. xxii 42 



