U N I 



Species 29'J. (Miis. Taylor.) 



UnIO CONFRAGOSUS. Un. fe^ld liiai/iia, snliild, ohloiii/o. 

 mhquadratd, infiatd, midnUild el tiihi'iTuhdd, i-plihr- 

 mlde viridi lavirjatd conceiilriir sfrii/nm Indiitd : In- 

 Icrc postko rotunddiiiii (irKjiilalo, rmjix mikjhU oliHi/iiis 

 diraricalis et pmpe nmhones lithi'renlh flviialU l<il,'- 

 i-nliter milnilis aqmrnto ; /rtli'/v initini propc iiuihoiii's 

 tiibereulato et divaricatim sidraii), pmiie mtir(/iiiriii 

 lavigalo, nmbonibtts in sei-ichua duahiis fiilii-rculiilis, 

 inter tiihn-cula subplanntis. 



The rugged Unio. Shell large, solid, oblouij-sub- 

 quadrate, inflated, waved and tuberculated, covered 

 with a green, smootli,eoncentrically-striped epidermis; 

 posterior side roundly angular, roughened by large 

 oblique diverging wrinkles and near the umboes ele- 

 vated tubercles sulcated at the sides ; anterior side 

 tuberculated and divergently sulcated near the um- 

 boes, smooth towards the margin, umboes tuberculated 

 in two rows, subplanulate between the tubercles. 



S.vY, American Concbology, t. 31. 



ir.ih. North America. 



Tlicre are several other species characterized by a double 



niw oi' tubercles towards the umboes, but they are not, 



liki' this, of an oblong form. 



Viiio niirifiiriiiis, Lamarck. 

 H„b. Eiver Ohio. 



Species 300. (Mus. Sowerby.) 



;io cYLiNDRicus. Uti. testd elongata, ci/liiidraced, 

 rrami, pondfroad, Icemjidd, valde iiiaquilaterati, stra- 

 iiii/ied, ii/fir/dls viridibiis angidatin aspersd ; latere po>i- 

 tico prnfiinde aiirjiilaio, ad angidtim tuberculis mayiiis 

 riifinidix nrrimfo, post angidum. divaricatim undulafo 

 el tnhrrrnhdo, iiiargine dorsali elongato, recto, margiiie 

 JidiTidi aiihuhJlipio, termino aeniiiinato, margine veii- 



Species 301. (Mus. Taylor.) 



Unio .TaYENSIS. Un. testd suhlanceolatd, moderate coii- 

 ve.vd, solidd, striata, oUvaccd, posticii nigreseente, intus 

 et (id iiiidmtics olivaceo nebidatd ; latere postico pro- 

 d/iclo, recto, biangulato, acuminato, margine dorsali 

 recto, margine laterali oblijuo, termino triincnto, mar- 

 gine vetdrali usque ad medium, recto ; latere antico 

 breri, snbacnininato, margine ventraU sursuni acclici. 



.Tay's Unio. Shell sublaneeolate, moderately convex, 

 solid, striated, olivaceous, blackening posteriorly, 

 clouded with olive within and at the umboes ; poste- 

 rior side produced, straiglit, biangular, acuminated, 

 dorsal margin straight, lateral raargiu obliciue, end 

 truncated, ventral margin straight at tlie middle ; 

 anterior side short, subacuminated, ventral margin 

 sloped upwards. 



Lea, Obs. on Unio, vol. ii. p. 38. pi. 3. f. 23. 

 Unio ceqidlus?, Lea, vol. vi. 

 Unio Maconensis?, ibid. 

 Unio naviculoides ?, ibid. 

 It is quite possible that distinctions may be jiointed out 



between the above species, but probably they arc not 



greater than those which constantly occur between inilivi- 



duals and varieties of the same race. 



rlerido, medio uaididu 



pan 



'jntracto ; 



/,7//; „d Irrm 



liilrrr aidieo hrei-ixsiiiio, snhlrnncato, umlionihus pro- 



minentilms, nndainn tuberenHferis. 



The cylindrical Unio. Shell elongated, cylindrical, 

 thick, heavy, smooth, very inequilateral, straw-co- 

 loured, sprinkled with angular green spots ; posterior 

 side deeply angular, armed at the angle with large 

 round tubercles, divergently undulated and tubercu- 

 lated behind the angle, dorsal margin elongated, 

 straight, lateral margiu rather oblique, end acuiui- 

 minated, ventral margin elevated at the end, slightly 

 contracted in the middle; anterior side very short, 

 subtriuicated, imihocs prominent, wavily tuberculi- 

 ferous. 



Say, Enc. Amer. 



Species 303. (JIus. Taylor.) 



Unio rugosus. Un. testd viagnd, elVipticd, cras.ia, sub- 

 cowpressd, stramined, viridi radiatd, lavigatd, intus 

 alba et palUde salmoned ; latere jmslico producto, an- 

 gidato, post angnlum divaricatim nigido, ante angulum 

 oblique sulcato et tuherculalo, margine dorsali snbcon- 

 ve.i'0, termino sulitruncalo, margine ventrali conve.vo ; 

 latere antico snbacuminato, IcEvigato, nmbonihus parvis, 

 acnminatis, nndnlatiin tubercnlatis. 



The rugose Unio. Shell large, elliptical, thick, sub- 

 compressed, straw-coloured, rayed with green, smooth, 

 white and pale salmon-tinted within ; posterior side 

 produced, angidar, divergently wrinkled behind the 

 angle, obliquely sulcated and tuberculated in front 

 of the angle, dorsal margin a little convex, end sub- 

 truncated, ventral margin convex ; anterior side sub- 

 acuminated, smooth, umboes small, acuminated, uu- 

 dulately tuberculated. 



Barnes, Silliman's Journal, vol. vi. t. 13. f. 21. 

 Unio abducla, Say. 



Hab. North America. 



September, 1807. 



