'158 



Hob. Wynegunga Biver, 30 miles east of Nagpoor, in the 

 Deccan, Bengal (C. M. Wheatley). 



The following localities are attached to specimens in the Indian 

 Museum Collection : Damuda ( W. T. Blanford) ; Surat ; Sambal- 

 pur ; G-odavery River ( W. T. Blanford} ; Barod, about 130 miles 

 S.W. of Sepree. 



The dimensions of three average specimens are as follows : 

 No. 1 being those of the specimen figured by Hanley in the 

 1 Conchologia Indica,' and now in the British Museum Collection. 



1. 2. 3. 



Long 29 33-25 36 mm. 



Lat 42 51 55 mm. 



Diam. 17'25 19-5 21mm. 



292. Parreysia (Parreysia) favidens (Benson). 



Parreysia (Parreysia) favidens (Benson) ; Simpson, Washington, 



D.C., Smiths. Inst., Nat. Mus. Proc. xxii, 1900, pp. 842-843. 

 ? Mya spuria, Wood, Ind. Test. 1825, p. 12, pi. 2, fig. 35 a. 

 Unio favidens, Benson, A. M. N. H. x, 1862, p. 188 ; J. A. S. B. xxxv, 



1867, p. 138; H. & T., C. I. 1876, p. 6, pi. 11, fig. 1; Reeve, 



Conch. Icon, xvi, 1865, pi. 26, fig. 131 ; Pajtel, Conch. Sam. iii, 



1890, p. 152. 



Maryaron (Unio) favidens, Lea, Syn. 1870, p. 38. 

 Unioflavidens, Paetel, Conch. Sam. iii, 1890, p. 152. 

 Unio trirostriSy Musgrave, Hanley, Phot. Conch. 1863, pi. 2, fig. 9; 



H. & T., C. I. 1876, p. 6, pi. 11, fig. 6; Paetel, Conch. Sam. iii, 



1890, p. 170. 

 Unio tripartitus, Lea, Proc. Acad. Nat. Sci. Philadelphia, vii, 



1863, p. 190; Journ. Acad. Nat. Sci. Philadelphia, vi, 1866, 



p. 57, pi. 19, fig. 55 ; Lea, Obs. Genus Unio, xi, 1867, p. 61, 



pi. 19, tig. 55. 



Margaron (Unto) tripartitus, Lea, Syn. 1870, p. 35. 

 Unio smaragdites, Benson, A. M. N. H. x, 1862, p. 190 ; Blanford, 



J. A. S. B. xxxv, 1866, p. 347 ; H. & T., C. I. 1876, p. 5, pi. 10, 



fig. 5 ; Psetel, Conch. Sam. iii, 1890, p. 167. 



Original description : Testa transverse ovata, insBquilaterali, 

 crassa, subtumida, antice rotundata, postice subalata, declivi, 

 angulata, demum obtusa, margine ventrali convexiusculo ; disco 

 inaequaliter sulcato ; 'epidermide olivaceo-f usca, versus marginem 

 ventralem luteo-olivacea, postice viridi parce fasciata ; umbonibus 

 tumidis, prominentibus, decorticatis, sulcis radiatis angulato- 

 flexuosis indutis ; lunula impressa, elliptica, decorticata; liga- 

 mento elongate; carina umbonali laeviuscula, linea unica vix 

 elevata notata; dentibus cardinalibus crassis, fortiter radiato- 

 rugosis, lateralibus obliquis, elongatiusculis, valvae dextra3 duplic- 

 ibus, sinistrae subtriplicibus ; margarita pallide lutea iridescente. 



Long. 45, lat. 66, diam. 30 mm. 



Hob. Upper Ganges. 



