UNIO.— Plate LXXII 



nent, luniile broad, cnrdiiinl teetli Inrii-e, much laci- 



iiiated. 

 (-'ONRAD (as of llafiii.), Mouoi<r. Uuio. p. -tS. pi. 25. 

 llnh. Tennessee, North America. 



Tlie valves are concave before the uraboiial rid^'e, the 

 stages of increase rather distant, the hinge-inargin broad, 

 and the nacre usually devoid of colour. The species is 

 closely allied to ebenus, but the front dnrsal margin is; 

 much longer, and the lunule seems todill'rr: it has not 

 the shape of an arrow-head. 



Species 377. (Mus. Hanley.) 



Unio KUFUSCULUS. Ua. teUd jjarmt, oliUqui 



vilidd, caslaned, lamgatd, satis convexd ; margbte 

 ventrali in medio vel recto, vel subreimo, antice arcu- 

 atim et subrepente acclivi ; natibus haud emineniibus, 

 maryaritd riifescenle, dentibns cardinntibt/s hand 

 traiisversis. 



The little red Unio. Shell small, ublicjuely subovate, 

 solid, chestnut-brown, not sculptured, moderately 

 convex ; ventral margin straightish, or very slightly 

 retuse in the middle, arched and rather abruptly 

 rising in front, beaks not prominent, nacre reddish 

 cardinal teeth nearly perpendicular. 



Lba, 01)3. on Unio, vol. v. p. 14. pi. 14. f. 7. 



Hab. Abbeville district. South Carolina. 



The liijampul is large and prominent. 



Species 378. (Mus. Hanley.) 

 () FHASEOLUS. Uu. testa compressd, itiferiw in medio 

 ro/icaviiisciild, elongato-subovatd, sidiinaqiiilaterali , lu- 

 ted, radiis talis viridibus interrnptis cotifertim pictd, 

 laviffald ; poslice attenaatd, obtuse suhbiaiiijulatd, in 

 e.reiiipUx adidtis subcmieiformi ; murgine ventrali re- 

 tuso,^aiilici autem arcuato ; lunulii valde profunda. 



lauceolatd, timbonibus satis emitientibus, natibus acu- 

 iis, Margarita alba, dentibus cardinalibas magnis, py- 

 rainidalibus. 



The French-bean Unio. Shell compressed, somewhat 

 concave in the middle near the lower edge, elongated 

 subovate, not very inequilateral, dirty yellow, with 

 numerous broad, interrupted, green rays, not sculp- 

 tured, hinder side tapering, bluntly subbiangulated, 

 somewhat wedge-shaped in the adult ; ventral mar- 

 gin retuse in the middle, but archeil in front ; lu- 

 nule excavated, lanceolate, umboes ratiier prominent, 

 beaks acute, nacre white, cardinal teeth large, py- 

 ramidal. 



HiLDRETH, Amer. Journ. Sc. vol. xiv. p. 2S:j ; Say, Anier. 

 Conch, pi. 23. 

 Unio planulalus, Lea, Obs. on Unio, vol. i. 



Hab. lliver Wabash, etc.. North America. 



Species 379. (Mus. Hanley.) 



Unio gibbosus. Un. testa ponderosd, oblonyo-acuminatd, 

 antice brevi et ventricosd, poslice compressd, luted, 

 radiis viridibus compositis corifertim pictd, Imvigatd ; 

 mnrgine ventrali inagis minusve arcuatd ; area posficd 

 dorsali angiistd, humid magna, profundd, margaritd 

 ntbidd, dentibns cardinnlibiis magnis, laciniatis, pyrn- 

 midalibus. 



The gibbous Unio. Shell heavy, peaked oblong, short 

 and ventricose in front, compressed behind, dirty 

 yellow, densely painted with green compound rays, 

 not sculptured ; ventral margin more or less arched, 

 umbonal slope narrow, lunule large, profound, nacre 

 white, cardinal teeth large, jagged, pyramidal. 



Barnes, Silliman, J., vol. vi. pi. 11. f. 12. 

 Unio dilatatus, Conrad (as of Raf.). 



flab. Upper Mississippi and Missouri, North America. 



The hinder side tapers above and below to a blunt 

 peak. 



