844 PEOCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



tPARREYSIA TAVOYENSIS var. TRIEMBOLUS Benson. 



* Unio irieml)olus Bensox, .11. As. Soc. Beng., XXXV, 1855, p. 144; *Ann. and. Mag., 



X, 1862, p. 190.— -"Hanlky aud Theobald, Conch. lud., 1876, p. 43, pi. cvii, 

 fig. 2.— *PiETEL, Concli. Sam., Ill, 1890, p. 170. 



* t Unio hotmgdar aniens Tapperone-Canefri, Ann. Mus. Civ., VII, 1889, p. 341. 



Burma; India. 



tPARREYSIA VULCANA Hanley. 



* Unio vulcanus Hanley, Pr. Zool. Soc. Lond., 1875, p. 606. — "Hanley and Theo- 



bald, Conch. Ind., 1876, p. 62, pi. clv, fig. 3.—* P.etel, Conch. Sam., Ill, 1890, 

 p. 172. 



Burma; Pegu. 



tPARREYSIA FE^ Tapperone-Canefri. 



* Unio few Tapperone-Canefri, Ann. Mus. Civ. Gen., 2d ser., VII, 1889, p. 340.' 

 Meetan Eiver, Burma. 



tPARREYSIA RAJAHENSIS Lea. 



(^* Unio rajahensis Lea, Pr. Am. Phil. Soc, II, 1841, p. 30; * Tr. Am. Phil. Soc, VIII, 

 1842, p. 239, pi. XXIII, fig. 53 ; ^ Obs., Ill, 1842, p. 77, pi. xxiii, fig. 53.—*- H. and 

 I A. Adams, Gen. Eec Moll., II, 1857, p. 495.— ^Chenu, 111. Conch.. 1858, pi. 



XXVI, figs. 3, 3a, 3&.— * P.etel, Conch. Sam., Ill, 1890, p. 165. 

 (*Margaron ( Unio) rajahensis Lea, Syn., 1852, p. 25; 1870, p. 38. 

 [ ^Unioindicus Sowerby, Conch. Icon., XVI, 1866, pi. XL, fig. 222. — 'Hanley and 

 Theobald^ Conch. Ind., 1876, p. 43, pi. cvii, fig. 1. 

 ^ Margaron (Unio) indicus LiEA, Siyn., 1870, 1^.31. 



India. 



(Group of Parreysia rugosa.) 



Shell rather solid, elliptical to subtrapezoidal ; beaks full, with yAg-zag- 

 radial sculpture aud line corrugations and granules over the surface 

 of the shell. 



tPARREYSIA RUGOSA Gmelin. 



*Mya rugosa Gmelin, Syst. Nat., 13th ed., 1788, p. 3222. -— *Wood, Gen. Conch. I, 

 1815, p. 109.— *DiLLWYN,Cat. 1, 1817, p. 53.— * Wood, Ind. Test., 1825, p. 12, pi. 

 II, fig. 33a ; rev. ed., 1856, p. 16, pi. ii, fig. 33. 

 ( * ZJrno rif^osHs KusTER, Conch. Cab. Unio, 1862, p. 290, pi. xcvii, fig. 5.— 'Blan- 

 eord, Jl. As. Soc. Beng., XXXV, 1867, p. 137.— *P.etel, Conch. Sam., Ill, 1890, 

 p. 166. 



Ooromandel. 



^Not figured. Shells in the U. S. National Museum from Fea show this to be a valid 

 species. 



2 Gmelin refers to the Mya corrugata magna, etc., of Chemnitz, in the Conch. Cab., 

 X, p.376, pi. CLXX, fig. 1649. There is a shell in Lea's collection from the Vellaur 

 RiA'er, southeast India, which seems to be this species. 



