U N I 0. 



Plati; LXXIX. 



Species 413. (Mus. Hauley.) 



Unio occatvs. [7/. tedd parvd, ieniniisculd, (kpressiiis- 

 cnkl, ovnU-suhqiinrlrald, anlici OMjustatd, postice di- 

 hitatd et subbiatujuMd, paUidi viridi, liris variis 

 vi/tUis, oilifjiiis subgrnnosk dicertjmtibtis siiperiie cor- 

 riigntii, anlice pr<eterea ruffi-s devaik hiferne or- 

 iiatd ; liris an/ ids dcorsum H relrorsum spectantibiis, 

 liris posticin tciriioribas siibradiatim dicergenlibiiis el 

 amjulos aciilos cum liris rnediis mnjoribns superiie 

 formautibus ; cosld mnbonali laid, Mud elevata, scd 

 conspictid ; Iv.nuld luinimd ; ored dorsali poslicd lali- 

 iisculd el concavd, iialibus parvis, vixque obliipds, 

 iiKirrjariltx ulbd, dentibus cnrdiniiUlnis in iitrdqiie vul- 

 ri'hi i, compresso-pyramidaHbiis, I/nml fnii/sversis. 



The iiAiiKowED Unio. Shell small, tliiiinisb, rather de- 

 pressed, of a somewhat square-oval shape, narrowed 

 in front, dilated and subbiangulated behind, pale 

 £;'reeii, wrinkled above by raised lines, which are nu- 

 merous, slanting, subgranular, and diverging in va- 

 rious directions, adorned moreover towards the ven- 

 tral etige with concentric raised wrinkles ; front 

 raised lines looking downwards and posteriorwards, 

 extreme posterior lines finer, subradiatingly diver- 

 gent, and forming near the beaks acute angles with 

 the larger central ones; umbonal ri<lge not promi- 

 nent yet conspicuous, lunule minute, umbonal slope 

 broadish and concave, beaks small, scarcely slanting, 

 nacre white ; primary teeth two in each valve, com- 

 ])n ■^-^d-pvl■alllill:ll, not transverse. 



Lka. .Inuni. Ac. X. S. rhilad. scr. 3. vol. v. (Obs. on 

 Uni.i, vol. X. p. :!-i), pi. :,(). f. 30-t. 



J/,d,. r.eugal. 



There are one or two darker rays upon the umbonal 

 slope. The hinge-plate is peculiar. The extreme ante- 

 rior lira? do not run in the same direction as the rest. 



Species -ilS. (Mus. Hanley.) 



L'mo SANlUill. Uu. lesld pared, vel ovalo-obloiigd cras- 

 ■vHSCiild el postice veiilricoid, vel magi's elongnld leiiui 

 et siibreiilricosd, l/ilco-olivaced concolore, ad coslam 

 iiiiibuiialeiii. hand viridi picld, Hiiblrpvigatd, riigis iiicre- 

 ,„e»/; rndibus laiih,,., s>d,;dlrald, margine venlrati 

 ret/ISO, margine durs/i/i portico mngis miniisve acclivi. 



nred poslicd dorsali crmrard, Iniinld pnrrd, snlin air. 

 tern conspicnd, iimbonibiis emiiienlilnis, iinlihux coneeii- 

 trice ii>idalo-j)licalis, margnrild alliidd, dentibus car- 

 di/ialib/is satis magt/is. 



Sandri's Unio. Shell small, either ovate-oblong thick- 

 ish and posteriorly ventricose, or more elongated 

 thin and less ventricose, of an uniform olivaceous 

 yellow, not painted with green at the umbonal ridge, 

 smoothish, merely subplicated by coarse wriid\Ies of 

 increase ; ventral edge indented, hinder dorsal edge 

 more or less elevated, hinder dorsal area concave, 

 lunule small, yet tolerably distinct, umboes promi- 

 nent, beaks with concentric wavy folds, nacre whit- 

 ish, cardinal teeth tolerably large. 



Villa, in llossmiissl. Icon. L. und S. Moll. pt. 13. p. 20. 

 pi. 51;. f. 748, 749. 



Ilab. Dalmatia. 



However dissimilar in iispect, this shell runs by almost 

 imperceptible degrees into elongatulns and Re(iiiieiii. 4'hi; 

 shorter form delineated is the var. sericata, which is fur- 

 thest removed from the allied species. The front dorsal 

 corner in the more characteristic specimens is apt to pro- 

 ject in an angular manner. 



Species 414. (Mus. Ilanley.) 



Unio Bonellii. Uh. lesld tenni. siibotdii/Hr oUougd, s,r- 

 piiis suLarcuald, valde hirequitateruli. deprrxsii, imtire 

 angnsld, postice prodiicld, otiriieeii, lunid nntnild. 

 trevi, margine reiitrali m.:gis ,.,u,.,srr r.-le^n, m.ld 

 nnilioiudi ptanetntd. tiniehl mige^t.i : „..,t.u,iilu'-< Imnd 

 eiiiiiienlibns, pticis angiistis irregiitnrtbns ad e.iiremi- 

 lates siiblramversim. iiiididatis ; inargoritd alhidd, 

 denle nnico con/pressn in iitrdgiie ralviild, dentibus 

 Isleralibus unllis. 



BoNELLl's Unio. Shell thin, sumewliat ()l)li(pu4y (ililimg, 

 usually subarcuated, very inccpulateral, ilcprej-siil, 



rayed, smootli, willi a more or k->s imifulfd ventral 

 niarsiin. a IIiiilumI ninbonal ridge, and a narrow hi- 

 nule; uuiIhiiv uhI [Udniineut, somewhat transversely 

 waved at llnir 1 \tri'niities by irregular narrow folds, 

 nacre wliili>li, a single compressed tooth in each 

 valve, no lateral teeth. 



July, ISfiS. 



