U N I 0. 



l'i,ATi: LXXIII. 



Species 373. (Mus. Hanley.) 



Unio NUX Persica. Un. testa perparv.-i, snlidd, ub- 

 longo-subrhomboidea , postici oblique b'uiiigidutd, fusco- 

 olivaced concolore, pticis riidibus undique scidptd, 

 plicin antice deormm declivibus, delude breviter angu- 

 latbn acclivibus, po&tremo transvenis (liand conceri- 

 trickj ; casta umbonali angtdatd, margaritd alba, 

 dentibas curdliialibus magnis, hand laiiiinatis. 



The walmut Unio. Shell very small, solid, oblong- 

 subrhombic, obliquely biangulated behiiul, of a uui- 

 tbnn dark olive, everywhere boldly scul^Jtured by 

 coarse folds, which in front run obliquely downwards 

 towards the centre of the disk, then diverge for a 

 brief space upwards, and finally slope almost trans- 

 versely (not concentrically) to the hinder margin ; 

 umbonal ridge angular, nacre while, eanluial teeth 

 large, not laminar. 



DiXKEK. Zeitschr. Malak. 1848, p. IS:;. 



Hah. Chnia (teste Dnnker). 



Iteminds one of a young Osbnkii. The anterior side is 



^hort, the beaks rather prominent, and the concave area 



beneath the ligament is usually marked with a few line 



divergent raised wrinkles. 



Species 37-i. (.Mus. Hanley.) 

 I'sio .\ il.oTlcus. fit. testa parvd, validd, ijcali-siib- 

 qiiadrutn, siibveiitricosd, olivucei concolore, riigis ele- 

 vatis riidibus (el antice conferlis) coucenlrice scidpld, 

 latere aiitico hand peeuliariler brevi, latere poslico 

 K'ibbiaiigula/o ; margine ventrali vix retuso ; area pos- 

 ticd extreind cniicavd, liris obliqitis divergentibus coii- 

 fertiin ornatd, natibus aciitis, hand eminentibu^, lu- 

 nula profunda, lanceolatd, margnritd nitide albido- 

 rnbescente, dentibus cordinalibus siiblaminatis. 

 The Nile Unio. Shell small, strong, subquadrately 

 oval, siibventricose, of a uniform olivaceous tint, 

 with coarse, raised, concentric corrugations, which in 

 front are densely arranged, anterior side not very 

 short, posterior side subbiangulated ; ventral margin 

 scarcely indenteil ; extreme posterior area concave, 

 and adorned by crowded, obliquely divergent raised 

 lines; bt-aks acute, not prominent, liinule deep, lan- 



Caili.aui), Voy. a Meroe, vol. ii. pi. Gl. f. 8, '.J. 

 Hab. The river' Nile. 



The beaks :iie adurnnl with two rows of grains, besides 

 some less marked rliverging raised lines. The scidpture 

 is that of the Indian species. The U. puinilio of Ziegler 

 (MSS. ?), and the U. Parreysii (our .Egypliacns) of \q\\ 

 dem Bnsch (in Philippi, Ab. N. C. vol. iii. Unio, pi. 5. 

 f. G), are given as svnonvnis bv Tea. 



tedu piirrtl, Hulnhi. rmtr 



suhrhiJiubuuled, late,',, niaenlis sii!,qiindr„lis ,ii,jru.iliri- 

 dibiis. serie unieii, postiee ornatd, e.vtri'hiitale pusticd 

 vbtiisissiine sulihiaiigiilatd ; Margine ventrali convexo, 

 anlire aerliei ; niargaritd alba, denlihus cardinalib/is 

 validis, permagnis, pyramidalibiis. 

 The intermediate Unio. Shell small, solid, intlateil, 

 subrhombic oval, yellow, with a posterior radiating 

 row of somewhat square distant dark-green spots ; 

 [lostcrior extremity very bluntly subbiangidated ; 

 ventral margin decidedly convex, rising in front : 

 nacre white, eanlinal teeth very large, strong, pyra- 



Lea, Obs. on Unio, vol. viii. p. Si. pi. 10. f. 227. 

 Ilab. Coosa river, Alabanni, North .America. 



The rather ineonspicuous nmbunal ridge is preceded by 

 a single row of spots. 



Species 376. (.Mus. Hanley.) 

 Unio CokdaTUS. Un. tesld suhcordato-pyranddali, sulidd. 

 ad unibones Injlald, postiee comjiressn; fusco-castaned, 

 Icvrigutd, antice perhrein, subtruncatd, inferne peeuli- 

 ariler ml iihdiih':. postici rofundato-subcuneifdrnii ■ 

 wargiei' rriilrnli •intici arcuato, postiee ineurcalo : 

 nalii. 'il,i,s, lunuld lata, dentilws eardi- 



THt 



