S2 Kiiisruw. f'tuviiitth mid t.unixtiitw Mtiliuuu f vol. "?;I 



of CarbiCitkt, and lias himself introduced new groups to replace the first two, 

 on the grounds that Australian species arc not regarded as rcferrable, to these 

 genera, by extralinutal workers. In general appearance- the shells themselves 

 ar similar to the English Orb and Pea shells, but in any case they axe su 

 small that close study is needed to recognise the species at all. Hence they 

 tend not |<3 fefc popular ; however they may be found in streamy, lakca and 

 marshy p/aces. often buried in the mud I have found them ill the hanks; c£ 

 ■streams, amongst the roots of reeds in the wet mud, They arc said to climb 

 reeds growing in the water. 



Iredale bus renamed Gabriel's .Sphotrinm tasttwtikum and records two 

 species from Tasmania. If the Victorian shell is not distinct tram the 

 Tasmaman. then it is at the moment, a moot point as to whether it be 

 equivalent to S. hisnutHtciiw or Iredale'* $ larnsedes. However, ae both these 

 shells are from South Tasmaman river system* (rht latter species is from 

 Great Lake in the Derwent watershed, and incidentally occurs not in the Lake 

 but in the outflow) and one is not yet convinced that they are separable, and 

 which, if either, is found m the north of Tasmania, it seems much more 

 satisfactory to accept IretUle's. S t-ictoriana . despite the brief diagnosis, until 

 it can be conclusively demonstrated that there arc specific differences, or 

 conversely, that there are no specific differences, present. It is hoped ^.t a 

 later date to make comparisons between shells from various localities in an 

 r-ffort to determine the re'ahanships in Tasmania. Collecting to tin*, *vul bw=- 

 been done fft several places. 



Class; PULECYPODA 



5uperfeinu> : NAIADACKA 



Family ; H YRJDELUNAK 



Subfamily: YliLl: SUM10MAL-; 



VELESUNIO. Iredale Aust. >Uu>l. S (I): h9 {.May 9, \93A). 



(Type- Umo <x>ubif,ntus Phdippi = U. bvloutunsts Conrad.* 



i. VBLBSUMO DA-SUn.LU (V,jia'> 

 «87l, tfonvHH, Vniv Villa, Joum. ,(e Couch t ffl £3 sofc xi ) ; m 

 1W id. pvitnm Itedale,, far, : 60. VI 3, rug, 4, & » 4, fig. \, 

 1934, id. yetexuma Allan. t''ut, Mat. SI (/): J66 (Nov.), with text fig. 



River Yarru. Mrs. Frcame't. .specimen rented by Joyce Allan came from 

 l'2vert< - nt, from a !a^oon : 'otY (I e "River Murray". 



Z. yELESUXfQ fESTATUS Iredalc 



1943. Usiatus^ Vctcsiinw Iredale, Aust. <W., 11 (4): 88 (Nov.). 

 1934. nwrn, Veleswdo Iredale, it:. : 62. Pi. 3, fig. 7, & PL 4, %. ? 



Type: BcntbaggL N.5.W. (non V avnst PI. 3, fig. 6, & PI 4. rig. 6.J. 

 1939 ihustrahs, H\>ndrHa Galirie). Mew. \&ih Mas. Vh-i 11. 129. PI, 4. 

 tic. 38. " 



The species hitherto regarded as H, ausimtis has been shown to have been 

 confused with a species of Vclesnnio. We are here concerned With the identity 

 of the shell figured by Gabriel, and 1 have preferred IT. lestatus for the time 

 being. The species is stated by Iredale to be common in Victoria and South 

 Avistraba. Gabriel gave distinguishing" point? ${ U, amlngtta Phihppi from hilt 



