UNIO.— Plate LXXII. 



Species 370. (ilus. Hauley.) 



Unio subtentus. Un. testa oblongo-elmigatd, antice ari- 

 (justn, pontic!; producta, satis compressd, luted, radiis 

 ■mridibus, iiderruptis, remoiiiisculis, lutiuscidis ornatd, 

 sublavigntd, ared posticd plicis divergeniibtis, talis, 

 depressis, eonspictie sculpld ; margine dorsali postico 

 convexiusculo, Imnd declici, Itmiild laneeolaln, inarga- 

 ritd palUdi aiiroitlio-nibrd, dentibus cardinuUbus 

 hand laiiiiuiitis. 



The corded Unio. Shell elongated oblong, mrrow in 

 front, prochiced behind, rather depressed, dirty yel- 

 low, with rather broad and ratlier distant dnsky 

 green interrupted rays, sniootli, except upon the 

 umbonal slope, wiiich is adorned throughout with 

 broad and depressed diverging folds; hinder dorsal 

 edge rather convex, not sloping ; hinule lanceolate ; 

 nacre salmon-coloured, cardinal teeth not laminar. 



Say, Amer. Conch, pi. 15. 



Hab. S. Carolina, N. America. 



Moderately large, rounded in front, and not provided 



with a well-marked umbonal ridge. 



Species 371. (Mus. Hanley.) 



Unio KENIFORJIIs. Un. ledd olihngo-subreniformi, va- 

 lidd, subveiilricutiii, brmnwd concolore, sublcevigald ; 

 margine dorsali postico brevi, rectivsculo, haud declivi; 

 margine ventrali incurvato, natibus aciitis, maboni- 

 bm satis eminentibus, luiitild inconspici/d, margaritd 

 n/bido-C(Priilescei/le, dmtibns cnrdiiuilibiin vnlidis, cris- 

 lalis. 



The kidney-shaped Unio. Shell oblong-subrenifonu, 

 strong, subventricose, of a uniform brown, neither 

 rayed nor sculptured; hinder dorsal edge short, 

 straightish, almost horizontal ; ventral margin in- 



curved in the middle, beaks acute, uuiboes r 

 prominent, no distinct lunule, nacre bluish-v 

 cardinal teeth strong and crested. 



Schmidt, MSS. in Eossm. Icon. ])t.. 3, p. 31. f. ;;;13 



Hah. S. Germany. 



This somewhat rare shell (not impossibly a variet; 



ther than a species) is rather short and rounded in I 



somewhat tapering (at least in the adult) beliiml. 



umbonal ridge, which is rather indistinct, is succeedc 



a broad and siiallow groove. 



Species 373. (Mus. Hanley.) 



Unio angustatus. Un. testa elongatd, postice altenn- 

 atd et truncatd, compressd (prasertim inferne juxta 

 wedluni), piced concolore, lavigatd ; margine dorsali 

 siihrecto, vix declivi, utrinqiie angiilato ; margine ven- 

 trali retiiso, antice siibrepente arcnatim acclivi, ared 

 posticd extrewd concavd, margaritd alba, dentibus car- 

 dinalibns triiusversis. 



The narhowed Unio. Shell elongated, tapering and 

 truncated behind, of a uniform pitch-colour, smooth, 

 compressed (especially below near the middle) ; dor- 

 sal edges nearly straight, scarcely, if at all, sloping, 

 angulated at each end ; ventral edge indented, rather 

 suddenly arching upwards in front, area beneath the 

 ligament concave, nacre white, cardinal teeth trans- 

 verse. 



Lea, Trans. Amer. I'h. Soc. N. S., vol. v. p. 4. pi. 17. 1. 

 43. 



Hah. Congaree and Cooper rivers, S. Carolina, N. Ame- 



The umbonal 

 a shallow groove 



conspicuous, and is succeeded 



