U N I . 



Tlatf, LXXXIU. 



Species 430. (Mus. Lea.) 



Umo cixNAMOminus, Till, iesid parvd, siilivi'jilricosn. 

 crasm, iiueijiiila/ern/i, ovali, postici Kuhl'ianynhiid, 

 Itevi cinnamoiiicd concolore, maryiiii: ventrali cnnvcxo, 

 costn mnhonal'i hicunsp'iaid, inuhoniliiis jiromii/idis. Iii- 

 iiuldviiUd; ,iiar;i„rild nll/nld : dnililjiis rnrd'nialiliits 

 crcc/is, creiiiiliitii, dnilihn^ l,il,-n,libi(.<! cinils, xnhnrlis. 



'rilE CINNAMON Unio, Sliell small, somewliat veutii- 

 cose, thick, inequilateral, oval, subbiano-ujated be- 

 hind, smooth, of a uniform cinnauion-colour ; ventral 

 margin conve.'i ; unibonal ridge not ronspicuous ; uni- 

 boes rather prominent ; no Innule ; nacre whitish ; 

 primary teeth erect, crcnnlated ; lateral teeth short, 

 nearly straight. 



Lea, Proe. Ac. N. S. Philad. ]SG1. p. ?,;i ; Obs. on 

 Unio, vol. viii. p. 104. pi. IG, f 24S. 



Hab. Tombighee river, Mississippi. 



Allied to ////.)• and Brnmh/nnns in outline, bnt di^^tin- 



-iiislird In the peculiar tint of its epidermis. 



Species 4o7. (Jriis. Smithsonian Institution.) 



Umo MACKODON. Uh. testd depressd, crassinsrii/d, -siib- 

 rrqidlalerall, ovaVi-elomjatd, antice porrecld et rvliin- 

 datd, pontic^ aubultciiuatd el aubaiiiiul'ild. vdjldijigald, 

 rijine vcntrnli uriiuil,:. 



lilted, iiinrijine ventnili (n-ienln. rn^/<i iiuilioiinli sub- 

 aiii/iihitd el incoii\-piciid, h'/i/'/,/ ,/////,/. fired posticd 

 aiii/iis/d ; iniiboiiibtis -•iiili-s eiiiliiciililiiis. iid iipices miiiiile 

 ijrnniilath ; mnrijiir'itd ulhidd ; deiitibii/i cardiiiidibiin 

 ui/ir/iil.s, efeclis, creiiidiilin. 

 : BiG-Tooriii II \'yu>. Shell depressed, thickish, I 

 neaily e(|"ilairr:il, clniigated-oval, projecting and I 

 rounded in front, ooniewhat tapering and subangn- I 

 lar bi'hiiiil. 'luoothisli. dirty yellow; ventral edge 

 arclifd ; umbonal ridge somewhat angular, not con- 

 spicuous; no Innule, hinder slope narrow, mnboes 

 moderately prominent anil minutely grained at their 

 extremities, nacre whitish ; primary teeth big, erect, 



Species 438. ("Mas. Newcomb.) 



Umo aureus. I'li. tesld pared, mibiii/equUalernll, •nib- 

 qniidratd, erasaiiisciild, s/ibdejiresnd. an red, liPi-'ujula : 

 cosld innboiiali ri.v proiiiiiiidd, ralitiidatd ; hniidd an- 

 ijiixtd, umboidbiis Hath eiiiiiieidibiis. inanjiiritd albii ; 

 deiitibiis cardiiiatibas ereelis. Klrhitis ; deiitdiiis lalera- 

 fibnii brevibiis. obliqai.^. 



The oolden Uxio. Shell small, somewhat inequila- 

 teral, sqnarish, thickish, somewhat depressed, golden- 

 yellow, smooth; >nnbonal ridge scarcely rai^ed, 

 ronndcd ; Innule narrow, undines tolerably promi- 

 nent, nacre w hitc, primary teetli erect and striated, 

 lateral tcctli smooth and slanting. 



Lea, I'roc. Ac. N. S. Philad. is,",!), p, 11;.> ; Obs, on 

 I'nio, vol, ix. p. 17. |)I. -^G, f ii\A. 



ILih. Tcxa^. 



Alli.Ml lu r,d„;,i,io^,i, and petriiii,^. It has a few Muali 



indistinct rays and rather distant marks of growth. 



Species 43!). (Mus, Smithsonian Institution,) 

 I'nio NODULOSUS. Uu. lestd ralde obliqnd, perxotida. 

 iiiaijh miiiiisve ceiitricosd, maxime iiireqinlaterali, an- 

 liee tritncatd, fused, liihercidis pergrnndibns el jjoslice 

 jdieis paiic'iK lalissiiiiis oriiid'l. iiiiiininibiis emii/eiitibiis, 

 I'-niiiiialibiif:, moraardd alba; inarijiiie cardinatila- 

 Imaiio, dentdjHx cardinalibiix in idrdqae enlndd dii- 

 plicibiis, SiTpias rude siiteati.s. liand Iraiisrersix : den- 

 I'lbiia lateralibifi lomjh. 

 The nodulous Unio. Shell very oblique, very bolid, 

 more or less ventricose. remarkably iiieqnilateial. 

 truncated in front, dark brown ; snrfaee ailorned 

 with very large tubercles, ;uk1 on the hinder slope 

 with a few very broad folds, umboes prominent and 

 terminal, nacre wliltc, liiiii;v-maigiii excessively broad; 



grooveil, not transverse ; lateral teeth elongated. 

 Wood {_Mya), General Conch, p. 100. pi. 23. f. 1 to 4. 

 Uido (jraiidideiis. Lea, Obs. on Uiuo, vol. ix. p. ~'7, 

 pi, 30, f '271, 

 //,///, Hot -.priiigs Arkansas X, .Vmerica (t.ste LeaJ. 



Tlie aspect is more that of a C;hine>e than a X. American 

 Uido. Lea considers his own species distinct from Wood's ; 

 both may prove to be the Clinnm plitnibeii of Chemnitz 

 (Conch. Cab, vol, xi. f. 1991, 1992). The U. nodidosas 

 of Plate IX, is merely the Leeid of Gray (Griffith's ed. 

 ('uvi<'r. AIol. pi, 21, f 1.), a comparatively common shell. 



•Inlv, 18G8. 



