UNIO.— I'LATi: LXXV. 



what IioUowcd ; niargiiis -ulip:irallel; iiiiiljots slighUy 

 raised ; nacre of a pcacli-lilossom colour, no lateral 

 teeth; primaiy loolh of the iii;hl valve |ir(uiiiiu'iit 

 and triangulai-, in the hfl valve loii-ilmliiial and 

 compressed. 



(iouLD {^lamodunta) Proe. Eost. Sue. N. II. vol. iii. p. 

 294; Exped. Shells, p. 433. f. .'■)45. 



Jhb. Oregon, California. 



Often confused with maniuii/ifiru, but easily distiii- 



guishable by its form, nacre, etc. 



Species 391. (Mus. Hanley.) 



Unio I'AMELlCUs. Uu. kiid ienui, cowpressa, oblongo-elun- 

 gatd, mhremformi, utrinque rolmidntd, posiire valik 

 producid, oUvaced, conco/urr, .siihl,/ rii/ahi : vuinjiiir 

 dorsali postico convexiusculo ; „i/in/i/ir rm/ni/i ir/nsn ,■ 

 costd vmhomdi tiulld ; >ioliLiis cnixi.s, IkiuiI cuiiiiriili- 

 Ims ; inargaritd albido-crcrnlcscenk, miicidis Ik-idi.t 

 fiicald ; denl'tbm curd'muUbus iirinsveisix. 



The sTAKVEl) Vnio. Shell thin, eouipressed, elongated- 

 oblong, subrcniform, ronnded at both ends, much 

 ])roduced behind, of an uniform olive-colour, almost 

 smooth ; liinder dorsal margin rather convex ; ven- 

 tral edge refuse ; no distinct nmbonal ridge ; beaks 

 eroded, not prominent ; nacre bluisli-white, with livid 

 stains ; cardinal teeth transverse. 



nouLi), IVoc. Boston Soc. N. H. vol. iii. ]). 2'.)t. 



i/ab. AValla Walla, (Jregon, North Ameriea. 



iientibus ; marijiirild (dbidi'i ; dnlihm Cdrdhinlibia 

 tramvenk. 

 C.\PiGHOLo's Unio. SIk^II thiu, compressed, elongated, 

 less inequilateral than usual, of an uniform olive- 

 eoloiu-, nearly smooth, narrow and rounded iu front, 

 blniitlv subliiaiiuidaled behind; posterior dorsal 

 edge a little rising and slightly eui'ved; ventral mar- 

 gin retuse, arching upwards in front ; no distinct 

 lunule ; beaks acute, moderately projecting ; nacre 

 whitish, cardinal teeth transverse. 

 Payk.^udeau, Cat. Moll. Corse, p. GG. pi. i. f. 4. 

 Hub. Corsica, etc. 



A moderately large shell, allied to, yet perfectly dis- 

 tinct h-oui, piciuniiii. The umbonal ridge is not elevated. 



Uld U( 



Species 393. (]\Ius. Hanley.) 

 sCENS. ill. tedd eloiif/uid, siibiiiceqiiilaterali, 



Species 392. (Mus. Hanley.) 

 Unio (Jamgliolo. Uu. iestd teimi, cou/pn'xsd, ('/o)ii/ii//i, 

 hand fecidiarilcr inrFqiiiUderal'i, (dlraced, concolorc, 

 xublarigaid, anllci aiignxtin^ rnlmnhdd, postice. ,siib- 

 bianyulald ; margiiw pod'wu dursidi hniler acclivi, 

 convexiusculo ; margine rcnlrali reluso, anike iifrii- 

 atini acclivi ; luiiuld nulld ; natibus acidis, saii.s cnd- 



ti'iuii, di-pressd, subcylindraced, antici in/erne /liaide, 

 iididi'jliird, olivaceo-viridi obscim radiatn, Icevigald ; 

 iimrgiiic dof.wli autico vix minime declivi ; margins 

 vi'vlr(di antice arcualiiA acclivi ; lunula, costdque urn- 

 bonaliiiicoiisjiicuis, imbonibns hand emineniibus ; niur- 

 gnritd mipi'ViH' piirpiiriui, iiifirni (dbidd ; dcntibiis im- 

 perfictis. 

 The gaping Unio. Shell elongated, less inequilateral 

 than usual, thin, depressed, somewhat cylindraceous, 

 gaping veiitrally in front, glossy yellow, with ob- 

 scure olivaceous green rays, smooth ; front dorsal 

 edge scarcely at all sloping ; ventral margin arching 

 upwards in front ; lunnle and umbonal ridge incon- 

 spiennns, ninhoes not projecting; nacre purple above, 



Sav, .\nicr. Couch, pi. 24. 



Unio oriens, Lea, Trans. .\mer. I'h. Soc. X. S., vol. 

 iv. pi. fl. f. 5 ; Obs. Unio, vol. i. p. 83. pi. (i. f. .5. 

 llab. Ohio. 



i garitai/ 



Lea, in his Synopsis, regards the spec 



ior side is 

 ig altenn- 

 as a .Mar- 



