Species of the Genus Unio. 191 



elongated form were taken by me in the River Goomty. I got 

 a handsome variety of the first, with a green and oUve epidermis, 

 in the River Dojora, near Bareilly ; and from the Gungut River, 

 near Monghyr, in Bahar, a shell which may possibly be a gib- 

 bous variety of the second. 



The anterior and posterior cicatrices are distinct, the latter 

 particularly so ; the apical cicatrices are indistinct on the inner 

 side of the cardmal tooth ; cavity of the beaks very deep and 

 angular. In affinity the species appears to be connected on one 

 side with the variety trigona of U- favidens, and, on the other, 

 with U. Rajahensis, Lea. 



The green Dojora variety is remarkable for the great develop- 

 ment of the teeth. The lateral ones are disposed to be treble in 

 the right as well as in the left valve ; and several parallel plicse 

 intervene between them and the exaggerated cardinal teeth in a 

 perfect specimen with the following dimensions : — 



Lat. 50, long. 37, diam. 23 mill. 



8. Unio plagiosomttj B., n. sp. 



U. testa transverse trigono-ovata, insequilaterali, crassiuscula, tumidi- 

 uscula, antice rotundata, postice subconvexe declivi, demum obtusa, 

 margine ventrali convexiusculo ; disco obsolete plicato, epidermide 

 luteo-olivacea vel olivaceo-fusca ; umbonibus convexis, prominenti- 

 bus, decorticatis, angulatim flexuoso-sulcatis, apieibus prominenti- 

 bus subremotis ; Ugamento brevi ; carina umbonali obtusa ; lunula 

 elHptica ; dentibus cardinalibus crassiusculis, radiatim eroso- 

 sulcatis, lateralibus subelevatis, modice elongatis, obliquis, valvae 

 sinistrae duplicibus, dextrse simplieibus : margarita colore salmonis 

 tincta. 



Long. 26, lat. 39, diam. 18 mill. 

 >> 22, „ o2, „ lo „ 



Habitat in flumine Cane, prope Banda, Bundelkhund. 



The anterior cicatrices, as well as the posterior, are subcon- 

 fluent, the apical ones situated on the under side of the cardinal 

 teeth. The nacre is very iridescent posteriorly. A dark raised 

 line borders the inner side of the umbonal slope, which exhibits 

 a few rugse at the upper part. 



9. Unio lavirostris, B., n. sp. 



U. testa transverse oblonga, subovata, valde insequilaterali, crassi- 

 uscula, medio subtumida, antice superne breviter angulata, deinde 

 rotundata, postice superne sensim convexe descendente, demum 

 rotundata, margine ventrali convexiusculo ; disco Iseviusculo, con- 

 centrice leviter striate ; epidermide olivaceo-viridi, fusco fasciata ; 

 umbonibus convexis, decorticatis, obsolete radiato-sulcatis, apieibus 

 prominentibus, approximatis ; lunula impressa, elliptica ; ligament© 

 elongate ; dentibus cardinalibus brevibus, crassiusculis, eroso- 



