Shell-hed underlying Volcanic Tuff. 9 



Tatea rufilahris, A. Adams sp., E. A. 'Smith, 1882, Journ. 



Linn. Soc. Load. Zool.. vol. XVI., p. 268, pi. VIT.,fig. 



19. Gatliff, 1905, Victorian Naturalist, vol. XXII., p. 



15. 



Three typical specimens of tliis interesting estuarine shell were 



found. 



Geims Bythinella, Moquin-Tandon. 

 Bythinella nigra, Quoy and Gaimard sp. 

 Paludina nigra, Quoy and Gaimard, 1834, Voyage Astrolal>e, 

 Zool., vol. III., p. 174, pi. LVIII.,figs. 9-12. 

 There appears to be a large and confusing synonymy for this 

 very variable species, and the present writers have under examina- 

 tion evidence which seems to point to the above specific name as 

 the valid one. Some of the confusion has arisen through bad 

 drawing or inconsistent description, and it is hoped that a com- 

 parison of the various types involved will finally settle the question. 

 At present the writers are in communication wdth some European 

 authorities on the subject, the results of which wdll be made known 

 as soon as possible. Examples of the so-called species, vicforiae, 

 ler/randl and petierdi are found in this fossil deposit. The varie- 

 ties occurring in the Pleistocene of Mowbray Swamp, Tasmania,*! 

 appear to most nearly approach Bythinella victoriae, T. Woods, the 

 types of which are in the National Museum, Melbourne. 



Fam. Cerithiidae. 

 Genus Potamides, Brongniart. 

 Potamides australis, Quoy and Gaimard sp. 

 CeritJiinm australe, Quoy and Gaimard, 1834, Voyage Astro- 

 labe, Zool., vol. III., p. 131, pi. LV.,fig. 7. 

 Potamides ai/sfralis, Quoy and Gaimard sp., Pritchard and 

 Gatliff, 1900, Proc. R. Soc. Vict., vol. XIII. (N.S.), pt. 

 I., p. 156. 

 A solitary example of this estuarine shell was found. 



Fam. BUCCIXIDAE. 



Genus Nassa, Lamarck. 



Nassa pauper ata, Lamarck sp. 

 Buccinum imuperata, Lamarck, 1822, Anim. sans Vert., 

 vol. VII., p. 278, No. 56. 



1 Chapman. Mem. Nat. Mus. Melbouine, No. 5, 1914, p. 57. 



