54 Klkshaw, FhtvKitih <Jtnf Laaislnnr .Vi'iViuni 



Vi-H. Not. 

 Vol. 7fl 



? HYKiDkLLA NSiKRACAXESStS {CoUo.. $ GfcfW) 



1932. )Mffrt('<":rHM'>, PropvhyntUikt Cotton & Gal>neL ^ . • 1S9, PI 16, fig. 8. 

 [93-1 lirpCWIViJUt ntitnuoncnsif. P^fich^ridilh Frcdalc, /.r . : 74, PI. $ fijr. 13, 



4 Pi. 6, fi« 0. 



|4& MilrwiWiwi'*. CrofchyruU-tfa Garinel /.c ! 1&, PL 4, fc, 42, 



Narraean River, Thotpdale. One liis i&rae doubt a* to the shell Tredale 

 examined. He may have mixed Irs tner&lities, or for that matter, the collector.;. 

 He may, hence, have bad the, shell, listed as H. twtratis above, collected b.y 

 J, A. Ker*haw from the Mitchell Rive* (and this dirYe*s somrwbat from 

 TrexiajVs dhtstratinn of P. nFat*paaet;sir) in whirl* ££$9 his "*uh_speoes" Would 

 immediately become a synonym, and had actually at first been placed a? snch 

 in this work. In addition the possibility oi a juvende entering info the picture 

 has rot made for clarity, and I was ltd to conclude that Iredaie had befell 

 more chan one form Dc. Hisei>ck remarks (personal coiimmniealion) :luit 

 the paiatypes of P Mtraeiinctitis are a noised series. 



8. H)'R1DELLA VJCJNAUS Qn&jh) 

 1934. (deprMtit.) vicinalra. Rngeshyr'ta Trcdale, l.tr, ; 72, 

 1$& ruhoilijnnfiis. / V.^A.v n'M.'a GahKel. f/ ! 1J2. PL 4. hg. 41. 



Mitchell Wwer Ircdale based his subspecies mi shells fro"** tiie Mitchell 

 River which Gahriel has continued m regard a? P, c\\\Uli\jotnns litt«Miiu.:b 

 as this nam*' is apparently not applicable, H. z&uut-ftg may be used, hut the 

 t.Uitns may he questionable, and I do not regard it as confirmed, a.; the 

 R. deprfs.tn series seems to need further study. 1 understand irom Dr. Hi.tcoek 

 that he and Or. McMichael regard {Ot>jofhytia as a synonym, From a 

 systematic point 0? view gome may prefer to retain it jja view of the elongate 

 ';hape and differences of the hinee teeth in the series, which may &?ve it 

 sub^reneiic value. Such a course has vofue when taige sr-rirs are involvprl. hi 

 preventing a gtflnis from hwmntnir unwit-ltlly whether that argument k oere 

 applicable depends on die validity of 1he "species*" involved. 



PROTOfTYRTnF.TJ.A Cotton ft fofcrfcj, fopc. kw. Soc Vict., H (2) ns.: 

 X® (1932) 



O'yp*' Umo >ttcueli;rusix UtimanO 



9 i-ROTOHyPfPLLL/l (iLEtVELCENSfS iDem.dml 

 1*98. dU'tuttifHAis, Uttio Pennant Prov. Rvx. Svt- Vwl W it.,\, 1 12. fiR. 9. 

 19.12, hi. l J n,Ujhxrtth'it« C<ALOii $ GUlrfeT, .'i : 160. PL t6, fig. 9. 

 193^ irl- Iredaie, i c: 74. PI. 5. Up. 14. & VI r>. ftp. 14. 



I93f>. ttl (Jahriel, /.c. : 133. PI. 4, kg, 43. 



G'enelg' Kiver. The authors, repaid the genus as primitive, and it may well 

 be that they are correct as the physiographic history of the Glene^g' £c£m£ 'o 

 lenrl weight to the necessary prolonged isolation which i? pcohably unique m 

 Victorian screams. Tliis aspect will not be dealt with here as it i= intended 

 to deal wiih it in wctior.s dialling wh.lt the gastropods. The authors' -enurfc 

 that ojm.gated mussels are typical or r. nick- flowing ?treams and "scarcely 

 warranted in present day slow-ftow:ny Austr<tliau rivers", is very mi<rtestiiig- 

 Thc Glenelu. w certainly a slugaish and mature stream, and one must assume 

 tliu! our mussel? have changed then* habits iby adaption in the blentiu;}, for 

 Vctcxuwo \r- plentiful m the otien vety swii!t South Esk River in l.'asiriania. 

 However Cippslarid streams harbouring ffyrirfrlkt now tend to be sluggish, 

 whi:reas tht*y have withtmt doubt known periods of grea'.et Hubuleuce in ihc 

 oast A. g;e»ierahzrd View shows lfyriii: f lin in P.astpru Victoria ami thp hi^h 

 tiiountainK (/£ depressa tuonticola on Ivosciiisko), VrlesuKW in the \Iutray* 



