U N I 



S[iecies 514. (Mus. Ilaiiley.) I 



Unio PAKMA. Un. tesld soUdd, ri'iilricnuii. urd/o-sii/n-or- \ 

 datd, valde ineeqmlateraU, oUviici-o-J'uscu. Iiuinl niiiniUi, \ 

 ad luiibones eminentes porcis aiir/nhirilinf^ brn-ibtix, 

 etiamqve superne ad costam v.mhonalem cumpicuam 

 cosluUs obliquk divergentibm ornatn, alibi rudh con- ! 

 ceidrice subrugosd vel mblavigafd; margine peidrali 

 subarcuato, antici acc/ivi ; area podicd dorsali siilco 

 levi radiante indructd ; wargaritd subalbidd, siipcrui 

 (iifi'O-o/iraci'O scepius fucatd; dentibiis cardinalibus 

 vnlidis mbtrigonifi, valde laciniatis ; lamelUs lateralibm 

 longis, curvntis. 



The buckler Unio. Shell solid, ventricose, ovate-sub- 

 cordiform, very inequilateral, olive-brown, not rayed, 

 adorned on the prominent iimboes with short angular 

 ridg-ps, and upon the consp'icuous umbonal ridge 

 witli divergent oblique riblets, elsewhere smoothish, 

 or somewhat coarsely wrinkled concentrically ; ven- 

 tral edge siibarcuated, rising in front ; hinder dorsal 

 area w'ith a shallow radiating sulcus ; nacre whitish, 

 usually stained above with yellowish-glive ; primary 

 teeth strong, subtrigonal, much jagged ; lateral 

 lamellaj long, curved. 



Benson (teste Theobald). 



Hab. Tennasserim, E. Indies. 



The beaks are too eroded to describe. The primary 

 teeth are so cloven that they might almost be described as 

 tlnre in each valve. There are traces of a larM lunule. 



Species 515. (Mus. Hanley.) 



o Bonne AUDIT. Un. ieatd obhmgo-elongald, crassiiis- 

 cnld, mrigis iiiiinme renlricosd, siibitucqiiilalerali, in- 



fenii retiisd, viridi-li<Uvceiite, in el supra costam mu- 

 boiiahi.i liiieis vircntibus triradiatd et porcis angustis 

 ciirvdlo-obliqiiis xcitlptd, alibi rugis pernmUis diver- 

 ijciitibiis snbdiignlatis ( iionnitiiquam siibobsoleiisj sagri- 

 mito-riidiiitd ; luilibus acutis, promimdis ; lunula vel 

 Hid/fi. vel jierangusld; margaritd argented ; deidibus 

 i-nrdnnilibus binis, sublamellnlis, corrngidis ; lamellis 

 liilrralibns subcurnalis. 



iNEAUii's Unio. Shell elongated-oblong, thickish, 

 iiiorc or less venlrieose. somewiiat inequilateral, in- 



dented below, yellow-green, on and beyond the um- 

 bonal ridge adorned with three dark-green rays and 

 narrow oblique curved ridges, elsewhere ^vith a sha- 

 green-like radiation of numerous diverging subangular 

 wrinkles (sometimes almost obsolete) , beaks acute, 

 somewhat prominent ; lunule very narrow, if any ; 

 nacre silvery white ; primary teeth two in each valve, 

 sublamellar, wrinkled ; hileral ianiellT somewhal 

 curved. 



Eyuoux, Mag. Zuol. ls:!s, p. 10. pi. 11^. f 1. 



Ilab. Pusnad stream of the i'eui (iuiiga, E. Indies (Theo- 

 bald). 



Eydoux's example has the central sculpture obsolete. 

 U. Shurteffleriauus, of Lea, seems scarcely more than a 

 variety. 



Species 51G. (Mus. Hanley.) 



Unio pugio. Uh. testd hand magud, solidd, plannlato- 

 veutrieostt, valde incequilateruli, postice acnminatd aut 

 rede cuneiformi, :onis virentibns et luteis (scBpius an- 

 gustioribiis) picld, noiinunquam obsolete rndiald,autice 

 obscurius concentrlce subsnlcnld, alibi l,trii/aln. cosld 

 mnbouali angulald et siijint p/ni/nlahi, area dorsali 

 posticd angustd et concariusciiln, iniUbiis n,r promimdis, 

 marqaritd jiallidi rubro-aiirautid ; denlibiis cardina- 

 libus validis, snbtrigonis, sagrinatis vel corrvgatis, in 

 idrdqite valvuld binis ; lameUis laferalibus productis. 



The dagger Unio. Shell not large, solid, planulately 

 ventricose, very inequilateral, peaked or straightly 

 wedge-shaped behind, painted with zones of dark 

 green and (usually narrower) yellow, at times indis- 

 tinctly rayed, rather indistinctly subsuleated concen- 

 trically in front, elsewhere smooth ; umbonal ridge 

 angular, flattened above, hinder dorsal area narrow 

 and slightly concave, beaks scarcely projecting, nacre 

 of a pale reddish-orange ; primary teeth strong, sub- 

 triangular, shagreened or wrinkled, two in each valve ; 

 lateral lamellae produced. 



Benson, Annals Nat. Hist. n. s. vol. x. (1862). 



Hab. E. Indies (rare). 



Despite of many differences, this may prove identical 

 with Fa:ii, yet the teeth, as represented liy Lea, look very 

 different. The hinder primary tooth of the rigiit valve in 



October, 1SG8. 



