U N I 



Species 521. (Mus. D'Or 



Mii 



i-it.) 



UnIO FOSSICULIFEEUS. Ull. h'std Vldidii, vc-iitricosd, 

 valde inatqtiUaterali, ohovald, aulici peraiigustd, siib- 

 Jceviyald, ol'waceo-lutescenle (bi jiiiiioribi(s liueis ciren- 

 tibui in et supra costam mnhoHalem radiatd) ; mar(jme 

 dorsali antico brevi, incurvato ; mari/ine ventrali, 

 arcuato, antich acclivi ; area posticd dorsali laiimculd, 

 coiLcavd, awjulo umbonali radiants aiitice defiidtd; 

 iKiiidd profunda, umbonibiis eminmlibits, maryaritd 

 argfiitm iridescmte macidis jiurpureis fueald ; cardine 

 deiitetubercidifuriiii /iiiico iii ulrdque valvuld instructo .■ 

 biiiudlis nulUs. 



The pit-beaeing Unio. Shell strong, ventricose, very 

 inequilateral, obovate, very narrow in front, smootbisli, 

 yellowisli-olive (in the young rayed with dark green 

 lines upon and beyond the ridge) ; front dorsal edge 

 short, incurved ; ventral edge arched, rising in front ;. 

 hinder dorsal area broadish, concave, defined in front 

 by the radiating uuibonal angle ; lunule deep, um- 

 Ijoes projecting; nacre silvery, iridescent, with purple 

 stains; hinge with a single tubercular tooth in each 

 valve ; no lamellae. 



H'Orbigny {Moiiocondijlica], Anier. Mcrid. Moll. p. IJ14. 

 pi. SO. f. 5, 6, 7. 



Hab. Argentine llepublic, S. America. 



Species .523. (Copied fr 



I'nio Tientsinensis. I'll, ttstd crasui, tumidd, obliqut 

 ovato-elUpticd, antice brevissiwd, concentriee rugoso- 

 striatn, ad mnhones tuberculin validis conjtiieiitibus 

 oriiatd, (suti epidermide ieiiui rubii/inosdj viridi, lunula 

 nnlld, umbonibim tiimidix prominuiis approxiinatisque. 

 mari/aritd atbd et Inteaceide ; deutibus cardinalibus 

 validis, crenulatis ; lamellin lateralihus longis. 



The Tientsin Unio. Shell thick, swollen, obliquely 

 ovate-elliptic, very short in front, concentrically 

 wrinkle-striated, adorned at the umboes with strong 

 continent tubercles, green under the thin ruddy 

 epidermis ; no lunule ; umboes tumid, rather pro- 

 jecting, approximate ; nacre yellowish and white ; 

 primary teeth strong, crenulate ; lateral lamella? 

 cloniiuted. 



CiiossE and l)i.;H];.\rx, 

 p. 2.57. pi. 10. f. 1. 

 llab. Kiv, r IViho at Tient-tMn, X. CI 



Couch. ISnS (vol. xi.). 



species o2o. (Copied from llupc'.) 



Unio U'OuisioNi.vNrs. Un. testa crassd, depressd, <equi- 

 laterali, irregiilariter subquadratd, antice rotiindatd 

 et oblique /lorrcctd, postice oblique subtruncatd, sub- 

 Imvigatd, fiisco-hilesccutc concolore, sidco pro/undo 

 pone costam tii,ibi)iiaU-i,i instructd ; margine ligamentali 

 perbrevi ; inargine ventrali antice arcuato, postice 

 subretuse acclivi: ared posticd dorsali angustd; 7iati- 

 tins rotiii/dis, riiiineidihiis ; marijaritd albido-caruhs- 

 cnilr: d,',dd„i^ aiilici^ rnlldis. laciniafls sen corrn- 

 pidis ; iiniirllis pn^lirn xiriiilis. 



D'Okhk.ny's Unio. Shell thick, depressed, equilateral, 

 irrcgidarly stpiarish, rounded and obliquely projecting 

 in front, ol)liqnely subtruncated behind, smoothish, 

 iif a unilVinu \(lli>ui>li-brown, with a deep furrow 

 brliiiul llii- iiniliniiiil ridtce; ligamental edge very 

 shun, Ventral margin arched in front, subretusely 

 rising behind; hinder dorsal area narrow; beaks 

 mnnded and pruniineut ; nacre bluish-white; hinge- 

 margin broail and much curved ; front teeth strong, 

 jagged or wrinkled ; hinder lamell<B striated. 



IIi:i>K and Devii.le, Mag. Zool. 18.50, pi. 16. f. 1 ; Anim. 

 IWnier. Sud (Exped. Oastelnau), Moll. p. 83. pi. 17. 

 f 1. 



Hub. Upper Amazon. 



Spe 



(Mus. 



Urbi 



Mus. Brit.)- 



Unio GliAlt.\v.\N.\. Vii. trstd hand magna, crassd, ven- 

 tricosd, vahh- iiun/ndiderali, rotnndato-ovali, fused 

 concolore, alriis laniellaribus concentrice rugulosd, 

 infenie arena! a ; latere poslico plicis 3 radiautibns 

 Iqiinrnui superior e\l aihje'.liiir i porcato, ad e.rtremi- 

 latein rotiiiidain .- iialihii>i valde eminentibiis, coidortis ; 

 liintdd nulla; manjaritd albidd, nonnnnquam ruhro 

 pallide lincid ; margine cardinali lalo ,- tnbercnlo 

 curdiiiidi ill iitrdqiie valvuld nnico, coiii/iresso, ubtiisis- 

 slinu : tuinellis laleralibus nidlix. 



