U N I 0. 



Species 3S7. (Mas. ILuiley.) 



Unio PLICIFERUS. Un. testa parvd, ovali-oblongd. Mud 

 pecuUariler iiia/fiilatej-nli, postice obtuse suhbiaurju- 

 latd, olivttceo-uigrescente, Jiaud varuujatd, niagh mi- 

 nusve ventricosd, liris aciitis dweri/eutibus in area pos- 

 ficd, alias oppositas obsoletiores sequenlibus, oniafd ; 

 wanjiue dorsali postico, Imud declivi ; m/iiyiue reii- 

 Irali cuuve.riiisculo ; margaritd lividd ; dcutihus canli- 

 ualibus luugnis, hand laminatis. 



The plait-bearing Unio. Shell small, oval-oblong, 

 not particiilavly ineqiiilateral, bluntly subbiangulated 

 behind, dusky olive, not variegated, more or less 

 ventricose ; adorned by sharp diverging strings on the 

 unibonal slope, and obscure ones running in the op- 

 posite direction upon the middle of the valves ; liga- 

 niental edge not sloping; ventral margin rather eon- 

 vex ; nacre livid ; cardinal teeth large, not laminar. 



Lea, Obs. on Unio, vol. ii. p. 61. pi. 17. f. 53. 

 Uuio carbonai-ius, Lea (olu). 

 Uuio plexua, Conrad, teste Lea. 



Hub. ilexico. 



The species so designated in an earlier Flute bears no 



resemblance to the original figure of Lea. 



Spcciis 388. (Mus. Ilanley.) 



Unio lienosus. Un. testa pared, ob/oui/o-subovu/i, aii- 

 tice niiijnstd et fix peeiiliariter br'eni, siibvetitricosd, 

 ti-eri, oliruceu-ciuerasceute, concolore ; rnargine dar- 

 siili poslteo reetiuseulo, hand decliri ; manjiue n-u- 

 lr<i!i iiicurcalo ; umljouibus liaud eiuiueuHLux; untilms 

 aeulis ; Innuld lanceolatd ; wargnritii iiilidis'iiind, 

 seepius subpurpured, aJiquundo paUide rubro-uurau- 

 tid, raro albidd. 



The spleen-like Unio. Shell small, oblong-suboval, 

 narrow and not particularly short in front, somewhat 

 ventricose, smooth, ashy olive-coloured, not varie- 

 gated; hinder dorsal edge nearly straight, not slop- 

 ing ; ventral margin incurved ; umboes not promi- 

 nent; beaks acute; lunule sharply defined, lanceolate; 

 nacre brilliant, usually ])\n-plish, sometimes salmon- 

 coloured, rarely white. 



Conrad, Mon. Unio, p. GO. pi. 34. f. ^'. 



Httb. Greene county, Alabama. 



A moderately strong species, of which the female dif- 



fers so nuicli from the male, that the identity is not easily 

 perceptible: in tiie former the lower hinder extremity is 

 obliquely cut oH'. The umbonal ridge is not conspicuous, 

 and is followed by a shallow groove. In a previous Plate 

 another species has erroneously received the same name. 



Species 389. (Mus. Hanley.) 



Unio TEitr/rruscuLUS. Uu. testd jinrc-i, elouipild, sub- 

 reulrlrosd, riu.-reii-viresceule, ,ii,ir,iiueiu eersns sub- 

 lulnl. tiuns nbsriiris eiridibiiH eoufert'uu niditdd, sub- 

 l„n,ji,l.'i ; iialibes aeulis. pnreis leuuissiiuis (antiee nl;- 

 li,/u,s. pasliee „eul,iu,juluribi,x) . vruatis ; ..lanjiue 

 dorsali ui'iui.ui- deelici. ulrnuiue augnlalo ; wurfjiue 

 ventrali retuso : enshi Uiubuuali evuspieiid ; hiuidd au- 

 ijusld^profuudd; utanjnritd albd; deulibus earduialdms 

 'suldaiuiuatis. 



The •ritEE-TitCNlc Unio. SIhU small, elongated, sub- 

 ventriro-i', dirty yellow towards the margin, greenish 

 ash-eiiloured above, densely rayed with more or less 

 obscure green lines, not sculptured excepting upon 

 the acute beaks, which are adorned by very fine 

 l-idges that are oblique in front, and acutely angular 

 behind ; dorsal edge not sloping, angulated at each 

 end ; ventral margin retuse ; undjoual ridge conspicu- 

 ous ; lunule narrow, profound; nacre white; cardinal 

 teeth sublamellar. 



Fhilippi, Abbikl. N. Cone. vol. iii. Uuio, pi. 3. f. 3. 

 Uuio Calliaudi, Fe'russac (teste Lea). 

 Uuio Uthopliagus, Ziegler (teste Lea). 



Hah. Sennaar. 



Vox Its size this is rather a strong sluil. Its linear 



ravs become very narrow and indistinct anteriorly. 



Species 3'JO. (Mus. Ilanley.) 

 Unio FALCATUS. Uu. testa elnii,j,:l.i. Jal,-<:ld, ralde lu- 

 cequilaterati, sulifuscd, ciiue^lnre. Inn is lucreuieuti ru- 

 dlbu.s taulniu ruijaUi, disru s„l,c.t;;,n,lo ; uiar,jiuibus 

 subparallelis, uudiuudms j„iidiilii,.i , muieiilibus; luanja- 

 ritd paUidi'purpnraseeute ; deulibus luleralibus uullis ; 

 deiile eiirdiiiiili lu ruled dextrd elevato, trii/ouu, iu 

 mini .siiiislrd Uiinjiludiuuli, compresso-triaui/idari. 

 The hooked Unio. Shell elongated, hooked, very in- 

 equilateral, of an uniform brownish hue, merely 

 rouf-heued bv coarse lines of increase; disk some- 



