U N I . 



Species 261. (Mus. Cuming in Brit.) 



Unio spinosus. Uii. testa ovata, aciimiiiatil, Jrevigntd, 

 viridi d fusco funciatd et radiatd, post/re medio d 

 prope iimboiies spiiiis extantibus armatd, intiis pur- 

 purea ; latere postico attetmato, acuminatu, angulato, 

 margine veiitrali conwxo ; latei-e aniico stdaiigmtnlo. 



The spinotjs Unio. Shell oval, acuminated, smooth, 

 banded and rayed with brown and green, posteriorly 

 in the middle and near the nraboes armed with 

 standing spines, purple within ; posterior side at- 

 tenuated, acmminated, angular, ventral margin i-o\\- 

 vex ; anterior side rather narrow. 



Le.\ on Unio, vol. ii. p. 57. t. 16. f. 50. 



II(th. Georgia, in America. 



Species 262. (]\Ius. Cuming in 13rit.) 

 Unio crispisulcatus. Un. testa purvd, breniter ovati, 

 solidd, straminea, in. angulis acntis omidno sidenid, 

 iitths albidd, postice caruleo-iridesceiite ; latere pos- 

 tico obloiigo, margine dorsali brevi, rectiusculo, mar- 

 gine Interali dedivi, termino vix truncato ; latere aii- 

 tico brevi, margine dorsali dedivi, margine ventrali 



The grooved Uxio. Shell small, shortly oval, solid, 

 straw-coloured, grooved all over in sharp angles, 

 white within, posteriorly iridescent-blue ; posterior 

 side oblong, dorsal margin short, rather straight, la- 

 teral margin sloping, very slightly truncated at the 

 end ; anterior side short, dorsal margin sloping, veu- 

 ti-al margin convex. 



Le.4, MS. in Mus. Cuming. 



Hub. ? 



Diliering from TJ. Burtoni in being covered all over 

 with the angularly diverging sulci. 



J'dscd, lavigatd, postice spinis hrevibus extantibus 

 medio d prope imbones armatd, int/is albd, subcferii- 

 lescenti ; latere postico oblongo, rotnndatim angulato, 

 termino rotundo, post angulum compresso, margine 

 dorsali redo, margine laterali dedivi, margine ven- 

 trali ante angulum contrado ; latere antico brevi, ro- 

 tundo, supra dedivi. 



The hill Unio. Shell oblong, subsolid, pale-brown, 

 smooth, posteriorly in the middle and near the um- 

 boes armed with short, standing-out spines, bluish- 

 white within ; posterior side oblong, roundly aiigidar, 

 rounded at the end, compressed behind the angle, 

 dorsal margin straight, lateral margin sloping, ventral 

 margin contracted in front of the angle ; anterior side 

 short, round, sloping above. 



Lea on Unio, vol. vi. p. 53. pi. 32. f. 109. 



Hah. Virinuia. 



Species 263. (Mus. Cuming in Brit.) 

 Unio COLLINUS. Un. tedd ohlongd, subsolidd, pallida 



Species 264. (Mus. Cuming in Brit.) 

 Unio Ciimingii. Un. testa compressd, crassd, magna, 

 expansd, in nodulis rotiindis plicald, intits albidu, den- 

 tibns crassis; latere postico magno, alato, margine 

 dorsali late devato, post angulum compresso, termino 

 trnncato, biangulato, margine ventrali ante angulum 

 sursimi acdivi, medio convexo ; latere antico brevis- 

 simo, umbonibus concentrice plicatis. 

 Cuming's Unio. Shell compressed, thick, large, ex- 

 panded, plaited in rounded nodules, whitish within, 

 teeth thick; posterior side large, winged, dorsal 

 margin widely elevated, compressed behind the angle, 

 truncated at the end, biangular, ventral margin slo- 

 ping in front of the angle, convex in the middle; 

 anterior side very short, umboes concentrically pli- 

 cated. 

 Lea on Unio, vol. vi. p. 9. pi. 21. f. 1. 

 Hub. Uphaupec Creek, Alabama. 



The plaits on the surface are rounded, so as to give a 

 quilted appearance. 



November, 1S66. 



