U N I 



Species 284. (Mus. Taylor.) 



Umo DECUEV.\TUS. Uii. Icxid aiihcylhitlracm, aliloiiya, 

 cra.islmculd, I inn hid, rpidrnn iilr fiiarrj-ii iiji-rscciiti, 

 . striata, ai uiiihuKes riihcxci'iiti Ifsnijutd iiidnld, i)ilii)s 

 nlbd, dentil)iis Idiii'mat'ts ; tatcfp aiil'icD hn-cixshiio, m- 

 tiindato, medio siibdc/jresso, maryine rrclo, nmliunihnx 

 inididatis, imnidis ; latere pnstiro siihiiiiiidraln, .snlule- 

 cnrratn, uliliiiite projw iiiarijini'iii dorsdh-m olisriiri: 

 liiciiiKiliri'lnlo, uuiryiiii' dorsn/i /irope iih/lioiii's recto, 

 tiiiii declici, termiiio anblruncato. 



The DECUiiVED Unio. Shell subcyliudrical, nbloiij;-, 

 ratlier thick, tumid, covered with a blackish-bniwii 

 striated epidermis, reddish and smooth near the uni- 

 boes, white within, teeth laminar, anterior side vei-y 

 short, rounded, middle subdepressed, with straight 

 margin, and the umboes undvdated, tumid ; postr- 

 lior side rather sqnare, slightly bent downwards, 

 obliquely and obscm'ely bicanalieulated near the dor- 

 sal margin, dorsal margin straight near the umboes, 

 thence sloping, end subtruncated. 



ROSMASSLER. 



J[<ib. Germany. 



The cylindrical form of this shell, as well as its oblique 

 double canal, subtruncated termination, and slight down- 

 ward curvature, will make its recognition easy. 



Species 385. (Mus. Angas.) 



L'NIO EvANSI. Uii. testa rolmidnto-sidiqnadrntd, teiini, 

 depressd, cpidennide teii/ii, olipaoni, leiiiiix.uine slriatd. 

 medio obsciirisxiuie cnignlaliiii. snbxidctilo ; IiiIiti' aii- 

 tico brepiiixcii/o, iiinrgiiii' durxnti brn-i, n-ctu, uuinjinc 

 laterati oldiqiio, iiiurijitif renlrnli sursiim acc/iri, nie- 

 dio siibdepres.V), KuilionibiiH nifitiidiitis ; latere postini 

 oblique siibqtwdrato, obscuri aiigiihilo, maryine dorxali 

 elevato, alato, margine lateral i obliqao, teriuiiio iiij'rd 

 sidiprodnrto, dentibiis Inniiiiiferis. 



Evans's Unio. Shell rounded-subquadrated, thin, de- 

 pressed, covered with thin, olivaceous, very finely 

 striated epidermis, in the middle very obscurely 

 marked with angular half-grooves ; anterior side very 

 short, dorsal margin short, straight, lateral margin 

 cilili(|ue, ventral margin sloping upwards, middle 

 siiglilly ileprissed, umboes rounded; posterior side 



oblicpiely s\ibquadrated, obscurely angular, dor-al 

 margin elevated, winged, lateral margin oblique, the 

 end rather produced beneath, teeth laminar. 



II. Adams and J. F. Angas, Pro. Zool. Soc. 18G4. 



Hob. Lagoon of the lower Murray River, South- Aus- 

 tralia, thin shell. 

 A rounded square, rather fi.attened. 



Species 386. (Mus. Taylor.) 



Unio Cuilensis. Un. testa oratd, teiims-iinid, viridi, 

 iiietalliferd, iiitenii, intiix cinered, ad iimtioues costetlix 

 dirergeidibns aciitis radinlii : tali're anlini breri. ,it>- 

 (Jiistato, rotinidatii, ad iiiiinjiiiem dorsnhun etiiivnln : 

 latere postiro vblii/nif s/ibii/ii/iilahi, /jroiliirtn, iiian/nii- 

 diirxali rerfiifxci/lii, „i<in/i,/e lateriiti di'eliri, tenaiao 

 sabtraacalo, maryine reiilrali teqealiter coarexo, dee- 

 tibim lamiiiatis, teiinibns. 



The Chilian Unio. Shell ovate, very thin, green, nn - 

 tallic, shining, ash-coloured within, rayed at the 

 umboes with divergent acute riblets ; anterior side 

 short, naiTow, rounded, cuneated at tlie dorsal mar- 

 gin ; posterior side obliquely subangular, produced, 

 with dorsal margin rather straight, lateral margin 

 sloping, truncated at the end, ventral margin equally 

 convex, teeth laminar, thiu. 



Parreyss. 



Ilab. Chili. 



M. Geale has also received this species from Portugal. 



■ies 287. (Mus. Tavlor.) 



Unio gigas. Un. fexld sMriy 



unulanald. 



dir 



nyald, inti,. 



snhun 



■pnrpai 



six. extus epidermide myrd iiidiitd ; latere aiilieo bre- 

 risximo, aiHjmlo, muryiiie ventrali snrsnm. aecliri, 

 medio prope umboiies unduluto, uiiitjunibns depressis ; 

 latere poxtico ina(pio, expanso, oblique biaiigulalo, 

 marijine durxali elernto, alato, muryme laterati de- 

 clici, tn-mini, inter anynlos prodncln, Irancntn. 

 The giant Tni... SIu-U Miblii-ona], il;,tlrne.l. tliirk, 

 divergenlly wrinkled, purpli^i iii>i.l.', "illi Ihirk 

 teeth, covered outside with a bla.-k rpideiniis; an- 



June, 18G7 



