U N I 



LXXV 



Lea 



Hah 

 Til 

 low 



Species 394. (Mus. ILuilcy.) 

 ) FAEULA. Uu. testa farm, obliDiiid-aiiliiiiiailrald, 

 siibiiia'quilaleraU, valMa, dcjircsm, epidcniiii/r Iriinis- 

 siii/d cinpreo-virescente rad/is nHnici'is iii/'cnir onm/d 

 III e.ri'iiiplis peifeclis venlitd, Lcriijald, plir'nt nn/issi- 

 niis panels arcuatis ad wiibows comprcxmis (rrl n-tii- 

 ■la-ij podlce nndata. ; ■marg'me dorxuli aiiln-l- di-cltri, 

 postlce siibdeclivi; exlremitate posticd hlamjithild ; Mar- 

 ijiue veuiraU in medio retiiso, antici accllvi ; area pos- 

 ticd dorsali laid, mngis minusve concavd ; iiatiius 

 ficutis, satis eminentibus ; lumild Incoiispiciid ; inarga- 

 ritd ruhro-anrantid ; deittibus lateralibus mdlis. 

 LITTLE BEAN Unio. Shell Small, squarisli-oblong, 

 scarcely inequilateral, strong, depressed, covered with 

 a peculiarly thin epidermis of greenish ash-colour, 

 adorned with olive rays beneath, smooth, but with a 

 few very coarse arched, transverse folds ou the hinder 

 side of the more or less retuse umbonal region ; dor- 

 sal edge sloping in front, less so behind ; hinder ex- 

 tremity biangulated; ventral margin indented in the 

 middle, rising in front: dorsal posterior area broad, 

 more or less concave ; beaks acute, moderately pro- 

 jecting ; lunule indistinct ; nacre orange-red ; no late- 

 ral teeth. 



{Margarilana), Trans. Anier. Ph. Soc. vol. vi. (and 

 Obs. Unio, vol. ii. p. 44), pi. 13. f. 39. 

 , Cumberland river, Tennessee, 

 ic njiper angle of the hinder side projects bcynnd the 

 . Tlie iiinder primary tooth of the left valve is 

 A the top. Seems only a form of Ourrcgann. 



Species 895. (Mus. Hanley.) 

 jNIO deltoideus. Vn. tesld parvd, ra/Idd, snbova/l, 

 ri'u/ricosd (id prceserllm, postlcej, vi.r iinriiHlhilrnili , 

 pallldi li(tm, radiis cvrideo-virldibiin (in „irdn, lalio- 

 ribii.s) pidchre ornald, hrvlgntd, ad iiiiihniu't, iinteiii, 

 pilch nidibus perpaucis (3-3) remolis, coiitliiiils, 

 Iraiisi-crsim undulald ; extremitate posticd obtuse siib- 

 biangulald ; margiiie veutrali vix retitso, aiilice areii- 

 atim acclki ; costd mnbouali lata, rolundald ; natibiis 

 aciilis, satis eminentUjus ; lunuld mdld ; margaritd 

 nlbldd, deutibus lateralibus millis. 

 I'liR tablet Unio. Shell small, strong, suboval, ven- 

 tricose (especially behind), scarcely inequilateral, 

 pale n.shy yellow adorned with liluisli-grceii rays. 



which are broader in the middle, smooth, except ou 

 the extreme nmbonal region, which has two or three 

 distant, oontinuon?, coarse, transverse folds ; hinder 

 extremity bluntly siil)l)i;iii;;idated ; ventral margin 

 scarcely at all iiidruliil, urcliing upwards behind ; 

 un)bonal ridge broad, niuudcd ; beaks acute, mode- 

 rately projecting; no luiiulc; nacre white; no lateral 

 tcrtli. 

 Lea {JIargarilaiia), Trans, Anier. I'h. Soi'., vol. vi. (and 



Obs. Unio, vol. ii. p. 43), pi. 13. f. 38. 

 Ilab. OIlio river, near Cincinnati, N. America. 



In perfect examples there are :i very few small and 

 close longitudinal ridges in front of the beaks. The rays 

 are so broad in the middle as to appear the ground-colour. 

 The likeness to cakeohm is unpleasantly striking ; Lea re- 

 marks, however, that the front lobe of the teeth seems 

 larger in tins, tlie liimlrr one in the allied species; more- 

 over, that is a suialler shell, more flattened, and with its 

 undulations uubrokcii. 



Species 3'J(5. (.VIus. llanley.) 

 Li.MO SwAINSDN'l. Uii. Ifstii parni, ■•iidldixsiuiil, tiiinidd, 

 ubllqid 0C(dl-cllipHcd. iili-lmine ridiindald, valde liun- 

 quihderaH, ephh'nuidi' tfiml lnti-o-!iidiulinired veslltd, 

 Imujatd, plicis anlfhi piiiiris prrwiii/ius ad iimboues 

 eiiUnenii^s oniiild ; nnn'ifnti' mil rah fvivi'.vo, aidicf ac- 

 clirl; hniidd pruDnnl.i : ,i<,r,j„rlld albldd ; margin,' 

 carduiali hdo; ainl.ilr iiuihoirdi i,r<ij)i,idl.mind; dciili- 

 biis cardliialibiis inagiila ; deiiti.biis lalerallbus nidlis. 

 Swain son's Unio. Shell small, very solid, tumid, ob- 

 liquely ov;d-elliptic, rounded at each end, very in- 

 equilateral, clotlieil with thin epidermis, that is of a 

 dirty or slightly (ilivaeeous-yellow, smooth, but with 

 a few very broad transverse folds on the prominent 

 uniboes; ventral margin convex, rising in front; 

 lunxde deep; nacre white; liinge margin broad; um- 

 bonal cavity very profound ; jirimary tcetli large, no 

 lateral teeth. 

 Hanley, for Uuiopsis radlata. Swains. Jlalac. f. G~, 

 changed to 2Iytlluldrs, p. 3S2. 



Ilab. ■? 



A very peculiar almond-shaped shell, which is uineli 

 thinner behind than in front. The anterior mnseuhn- 

 scars are peculiarly deep, and the hinder tooth of the lett 



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