U N I 0. 



Tlate LXXXV, 



Species 450. (Mus. Hanley.) 



Uxio AsrEKATUs. Uu. testd soUdd, in medio ventricosd, 

 ■iitrinqxe dejiressd, valde inaquilaterali, antice irun- 

 catd, jiostice late rotu7idato-suhbian(/idutd, luted con- 

 colore, veri'/wis magnis depressis 7mdi(jiie (itisi (inlice 

 et nates vermis) ornatd, concavitate radiaide nulla in- 

 strucfd, verrncin posticis minorilas et in serielt/rs coii- 

 fertis curvatis ordinatis ; costd iimboimU nulld ; um- 

 homhun ohlitiuis, emineniibus, lunula conspicna, mar- 

 garitd alba, margine cardinali latissimo, dentibits car- 

 dinalibus permagnis, trigonis ; dentibits lateralibtis 

 percrassis. 



The kol-geed Unio. Shell solid, ventricose in the 

 middle, depressed on either side, very inequilateral, 

 tnuicated in froat, broadly rotundately subbiangular 

 behind, of a uniform dirty yellow, adorned except in 

 front with big, ilattened, wart-like tubercles, devoid 

 of any radiating concavity, the posterior warts smaller 

 and arranged in curved and crowded rows ; no um- 

 bonal ridge ; umboes oblique and projecting, lunule 

 conspicuous, nacre white, hinge-margin very broad, 

 primary teeth very big and triangular, lateral teeth 

 extremely thick. 



Lea, Journ. Ac. N. S. Philad. vol. v. (and Obs. on Unio, 

 vol. viii.), pi. 7. f. 318. 



Uab. Alalwma river, N. America. 



The ridges of growth are so arranged as to appear pli- 



ciform. 



Species 451. (Mus. Hanley.) 

 Unio elongatulus. Un. testa pand, tenuiusculd, snb- 

 ventricosd, oblongo-elongatd, modice in/nquilaterali, an- 

 tice porrectd et anguste rotundatd, luteo-oUvaced, hand 

 radintd, sed adcostam iimbonalem inconspicitam viridi 

 rnngis minusve fuca.td, lavigatd ; margine ventrali siib- 

 retiiso, antice arcuathn acclivi; margine dorsali pos- 

 fico jnndidimi acclivi, nmbonibus satis eminentibm, na- 

 ir,. ^ I'ni'ix I'ln'ris riidibus concentrice midatis, liinidd 

 ,//' . r " '■:! albidd, pallide ruhro scepins tinctd, 



i!i.i;;:',ii\ f,!ril,,iid'ihii.s magnis, cristatis. 

 The little elongated Unio. Shell small, thinnish, 

 subventricose, elongated-oblong, moderately inequi- 

 lateral, projecting and narrowly rounded in front, 

 olivaceous-vellow, not raved, but more or less stained 



with green at the inconspicuous umbonal ridge, 

 smooth ; ventral edge somewhat indented, rising in 

 a curve anteriorly ; hinder dorsal edge very slightly 

 elevated ; umboes moderately projecting, beaks with 

 a few coarse concentric undulations ; no lunule ; 

 nacre whitish, usually with a pale red stain ; primary 

 teeth big, crested. 



Von MiiHLFELD in Rossmiissl. Icon. L. uiid S. Moll. pt. 

 2. p. 23. f. 132, and pt. 13. p. 27. pi. 5(5. f. 751. 



Rah. Dalmatia and Laybach. 



Although distinct from pictornm, to which it has been 



referred by certain writers, the species comes somewhat 



too close to Reqiiieni to be accepted without demur. 



Species 452. (Mus. Hanley.) 



Unio glabek. Un. testd pand, sitbtetiiii, depresm, ob- 

 longd, incequilaterali, luted, antice concentrice rugosd, 

 postice Icevi et radiis angnstis viridibus oruatd, mar- 

 gine ventrali retiiso, cosid nmbonali inconspicud, lunula 

 iiuprcssd, nmbonibus plicis riidibus subeoncentricit nnda- 

 tis, Margarita albo-carulescente, dentibits cardinalibus 

 pgramidalibits, laciniutis. 



The smooth Unio. Shell small, thinnish, depressed, 

 oblong, inequilateral, dirty yellow, concentrically 

 wrinkled in front, smooth and adorned with narrow 

 gi-een rays posteriorly ; umbonal ridge inconspicuous, 

 lunule impressed, umboes subconcentrically waved 

 with coarse folds, nacre bluish-while, primary teeth 

 pyramidal and jagged. 



Lea, Trans. Amer. Phil. Soc. vol. vi. (Obs. on Unio, vol, 

 ii. p. 34), pi. 10. f. 29. 



Hob. Tennessee, N. America. 



Species 453. (Mus. Taylor.) 

 Unio truncatus. Un. testd crassd, tumidd, ante me- 

 dium stibconcavd, eloyigatd, snbcimeiformi, maxime in- 

 aquilaterali, antice latiore, justice atteuuatd, inferni 

 sinuatd, nitidd, luted, uonnunquam. lideo-olivaced, 

 zonis increnienti fuscis paucis ornatd, hand radiald, 

 subhevigatd ; costd umbonali nulld, tmihonibus tuiui- 

 dis et rnlde eminentibus, lunula profunda, natibus in- 

 curcis, margaritd albo-argented, dentibits curdinalibiis 



September, ISGS. 



