U N I 



Species 418. (Mus. Hanlry.) 



T'NIO FALLAX. ihi. tfitd jjfin-d, teiini, ocali, S'ihinfj>ijiti- 

 latenili, iiiriiKiite et iiiferne rolniijiitd, mngis miiiiisve 

 vetitricom, flavo-olwaced, pos/ice rn/liis subcoiifcrtis 

 viridiljiis onia/ci, laviijald, margine dorsali. posfjce vix 

 declivi, cosld uinhonaU inconKpicud, himild nulld, nm- 

 hohiljns paulidum i-miiientiliiis, margariid alio-Uves- 

 ceale, dentibus cardiiiaU/iits Imninalin, laciiuatis. 



The deceptive Unio. Shell small, tliiii, oval, not very 

 inequilateral, rouiidecl below and at each extremity, 

 more or less veiitricose, yellowish olive, posteriorly 

 with rather crowded green rays, hinder dorsal edge 

 scarcely slojiing, umbonal ridge not manifest, no 

 liinule, umboes slightly prominent, nacre livid white, 

 ]iriuiiiry teeth jagged and lamellar. 



Lea, .lourn. Ac. N. S. Philad. ser. 3. vol. iv. (Obs. on 

 Unio, vol. vi. p. 79), pi. 1.5. f. :><i. 



Hid). Georgia and Tennessee, N. i\morica. 



Species 419. (Mus. Ilanley.) 



Unio triangtjlata. Uii. tedd parvd, teuai, subaquilate- 

 rali, tiimidd, (jbloiigo-subqnadruid, jiosli.ce bianr/ulatd, 

 iiitidd, okvaceo-fiiscescenlt; pracipui lacigaid, aiilice 

 axiem coiicentrice subplicaid, et podice Uris obsoktis 

 JivergenUhM ornatd, maj-g'me ventralt conver.iusculo, 

 cosld umbonali anyidatd ; iimboiiibiin rlrea/is, viargn- 

 r'dd subnlbidd, deidibiis curdiualihiis 'laugnh, deiilibns 

 Interalibus nidlis. 



The tiuple-angled Unio. Shell small, thin, subequi- 

 latcral, swollen, squarish oblong, biangulated behind, 

 glossy, brownish olive, chiefly smooth, but somewhat 

 plicated transversely in front, and adorned behind 

 with obsolete divergent raised wrinkles; ventral 

 edge rather convex, umbonal ridge angtilated, um- 

 boes projecting, nacre somewhat whitish, primary 

 teeth large, no lateral ones. 



Lea {Murgarituiiii), Journ. Ac. N. S. Pliih 

 iv. pi. -ii. f. Ill; Obs. on Unio, \ 

 p. 46. pi. -ii. f. 111. 



Hub. Georuia, N. America. 



2. vol. 

 pt. I. 



■inkles, those upon the 

 ed. The ridge midit 



Species 420. CMus. llanlcy.) 



Unio Japanensis. Vh. d'^ld hm'd magna, crnssi/iscidd, 

 orali-sidjqiiadrald, n'x xnbici/rlco-sd, jwstice s/ibbiaii- 

 g/dald, picm coiicoJorc, siipcr/ie plicii divi'rgenlibiis, 

 tidiercidisqiie parvis siibatigidathjt inidatd, margine 

 vi'htritli conve.ro anlice acclivi, casta nmbmwli hicon- 

 spiciid; area doraaU posticd concnrd, /iris obtlqids sn- 

 perne ornatd; Innidd nidld, margaritd idliido-ciendes- 

 cenfe, dentibus cardinrddjus trigonis, snlcatodaciidn- 

 tls ; dentibns lateralibiis rectis. 



The Japanese Unio. Shell not large, thickish, sipiar- 

 ish oval, scarcely subvcntricose, snbbiangnlated pos- 

 teriorly, of an uniform pitch-colour, somewhat angu- 

 larly waved above with diverging folds anil small 

 nodules; ventral margin convex, rising behind, um- 

 bonal ridge inconspicuous, hinder dorsal area con- 

 cave, and adorned above with slanting raised lines, 

 no lunula, nacre bluish white, priiuary teeth tiiau- 

 gtilar, jagged and grooved, lateral teeth not curved. 



Lea, Proc. Ac. N. S. Pliilad. 18.59, p. 153 ; Obs. on Unio. 

 vol, vii. p. (52. pi. 3C. f. 123. 



Hub. Japan. 



The innboes in the only good example known to uii 

 are eroded. Jlr. Cuming possessed two specimens, but 

 their condition was not satisfactory. 



Specii 



s 421. (Mus. Hanley.) 



j. Uii. trstd crassiiiacidd, siibqiiud- 



L NIO BIANOULATl^ 



rata, ovali ret oblongd, siibinceqidlate.rali, antice de- 

 pressd angiistd et rotiindatd, postice snbventricosd lata 

 et biangidatd, nitide Jlavo-oUvaeed, radiis magis mi- 

 niisve bderriiptis nigro-olivaceis iiudique ornatd ; an- 

 tice riigis coucentricis snbpUccdd, postice latigald. 

 margine dorsali antico Immiliore ; margine vent rati in 

 viedio siibrecto, postice siibacclivi ; costd nmbunali 

 plana, snbdiipUci, itaque ad extremitatem biangidatd : 

 area dorsali poslicd laliuscnlu, ambonibits satis end- 

 nentibns, margaritd alba, dentibus cardinalibns mag- 

 nis, pyramidulihns, dentibus laleralibns brevlbiis, eini- 

 nentibiis. 

 The two-angled Unio. Shell tolerably strong, squar- 

 ish, oval, or oblong-oval, not very inequilateral, de- 

 pressed, narrow, and rounded in front, broad sub- 



July, ISGS. 



