U N I 



Species 306. (Fig. a., Mus. Hauley.) 



Unio MULTIRADIATUS. Till, testd magna, suhovatd, si/iia- 

 lidi luted, radiis viridibus anr/nstls iindiqite coiifeiiim 

 pictd, mhltevigatd ; latere aidico hand peciiUariter 

 irevi, angusto, rotundato ; extremitate posticd subb'mn- 

 gidatd ; viargiue ventrali arcuato, ulniique (at aiitice 

 prasertimj acclivi; muboiiibns latis, emmeidUjus, lunuld 

 angmtd, margaritd albidd, derdibns cardiiiaUbns hand 

 laciniatis, derdibns laferalibus arciiaUs. 



The many-rayed Unio. Shell large, subovate, dirty 

 yellow, everywhere painted with close and rather 

 narrow green rays, not sculptured ; anterior side not 

 particularly short, narrow, rounded ; posterior ex- 

 tremity subbiangulated, ventral edge curved, rising 

 at both extremities, especially in front, umboes broad, 

 projecting, lunule narrow, nacre white, cardinal teeth 

 not laciniated, lateral teeth curved. 



Le.^, Obs. on Unio, vol. i. p. 48. pi. 9. f. 15. 

 Uiiiofasciolm, Cbnrad (as of Raf.). 

 Unio ligamentiiia, Deshayes. 



Hab. Ohio.' 



This is not the species erroneously so designated in 

 Plate LXI. It is a strong glossy shell, with its hinder 

 dorsal edge straightish and scarcely sloping, no distinct 

 umbonal ridge, and decidedly prominent cardinal teeth. 



Species 356. (Mus. Hanley.) 

 Unio camftodon. Un. testa lavi, oblongo-subrJiom- 

 boided, vix iiifcqidlaterali, Jiavo-olivaced, zonis livido- 

 bniiiiieis -tparsiin ornatd, huml nuliald, vix subveulri- 

 cosd ; margine dorsali (I III iii: rcriii, il,„iisso, postice vix 

 miniiiie declioi ; margine ventraii retu-io, nalibus acidis, 

 indiiudis, porcis obliquis conceidrice ornatis, lunuld 

 aiigustd, profunda, margaritd aliido-crerulescenle. 

 The bent-tooth Unio. Shell smooth, subrhombic-ob- 

 long, scarcely inequilateral, olivaceous-yeUow, with 

 two or three livid brown zones of growth, not rayed, 

 at most subventricose ; front dorsal edge straight, 

 lower than the almost horizontal posterior one, ven- 

 tral margin refuse, beaks inclined, acute, adorned with 

 raised, obliquely concentric wrinkle-^, lunule narrow, 

 deep, nacre bluish-white. 

 Say, Amer. Conch, pi. ii. 



Unio dcclivis, (Conrad, i\Ion. U. pi. 23 iteste Lea). 



Unio Sayu, Tappan (teste Lea). 

 Hub. New Orleans, N. America. 



The umbonal ridge, which is succeeded by two approxi- 

 mate sulci, with a raised strip between them, is far from 

 conspicuous. The hinder extremity is blrmtly subbiangu- 

 lated, the umboes are prominent, the ligament small and 

 narrow . 



Species 357. (ilus. Hauley.) 

 L'nio Clairbornensis. Un. tedd validd, subvenlricosd, 

 magix n/inusve ovatd, antice. hand peculia/'iter brevi, 

 Jlavo-subolioaced concolore, plicis increinenti obsoletis 

 nlrinque corrugatd, in medio Icevigalu ; margine ven- 

 trali in medio retuso, alder convexo, lunuld ineon- 

 spicud, margaritd albido-ccerulescente, denlibus cardi- 

 nalibus magnis, pyramidalibus, denlibus posticis (vel 

 lateralibusj elongatis, sayrinalis. 

 The Claikborne Unio. Shell strong, subventricose, 

 ranging in form from subovate to obovate, not par- 

 ticularly short in front, of an uniform tint of some- 

 what olivaceous-yellow, with obsoletely pliciform 

 wrinkles of increase at both extremities, otherwise 

 smooth ; ventral margin indented in the middle, con- 

 vex at each end, no distinct lunule, nacre bluish- 

 white, cardinal teeth large, pyramidal, lateral lojig 

 and shagreened. 

 Lea, Obs. on Unio, vol. ii. p. 105. pi. S-i. f. 115. 

 Hab. Alabama river, near Clairborue, N. America. 



The front extremity is rounded, the hinder dorsal edge 

 somewhat raised. The cavity of the beaks is deeply ex- 

 cavated, anil the umbonal ridge by no means conspicuous. 



Species 358. (Mus. Hanley.) 

 Unio platyrkhinchoideus. Un. testd elongald, haud 

 parvd, subtenid, subcylind raced, nilide fusco-custii ned 

 concolore, lavigatd ; antice brevi, postice produetd el 

 attenuald, inferne retusd, natibus satis eminentibiis, 

 lanuld iucompicud, margaritd albidd, dentibus cardi- 

 nalibus transversis, haud magnis. 

 The platyrrhincus-like Unio. Shell elongated, ra- 

 ther large, not very strong, glossy, subcylindraceous, 

 of an uniform rich brown, smooth ; anterior side 

 short, posterior side produced and attenuated ; vcn- 



