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species of land shell in Tasmania. Three other species have 

 been created from some of its varieties — H. dubitans, H. 

 bombjcina, and H. vexanda ; but as there are links whicli 

 insensibly connect them, they must also be reduced to the 

 rank of varieties of H. Sinclairi, as suggested by Mr. Legraud 

 and Mr. Petterd. 



H. MacDonaldi (Cox), — Is a most abundant form, and has 

 a very wide range. It is variable in size, form, density, and 

 sharpness of striae, and varies often from the prevailing form 

 with its beautiful, regular, alternate bands of colour, by 

 insensible degrees into a pure colourless variety, H. Juli- 

 formis, H. Gouldi, H. Kiiigstonensis, are merely varieties. 



H. Stanley ensis (Petterd). — Varies in colour and band 

 markings, in size, and in the density of striae. It is allied to 

 the former species, but there is a persistent characteristic 

 difference in the sculpture of the nucleus. I am of opinion 

 that Mr. Petterd's H. Tamarensis, which was originally dis- 

 covered by me at the Rifle Butts, Launceston, is but an 

 extreme variety of this variable shell. Hitherto it has been 

 found near to the sea or some tidal river. 



In the Ilelicidse sandstone of the Bass Strait islands 

 described by me in a former paper, I have discovered H. 

 Stanleyensis in a fossil state associated with the fossil remains 

 of H. Diemenensis, H. Pictilis,H. Furneauxensis, Vitrina, Ver- 

 reauxi, Succinea Australis, and Bithynella nitida. The 

 Helicidse sandstone is of post tertiary age and of the same 

 horizon as the raised sea beaches. 



H. ruga (Cox). — Is a very interesting shell, and forms a 

 link between H. Sinclairi and the fine shell H. lampra. The 

 latter, however, though found abundantly, is not so widely 

 distributed. It has only been found as yet in the northern por- 

 tion of the island. H. ruga is very widely distributed. On 

 Flinders Island it takes the place of H. lampra. It varies 

 considerably in size, colour, and sculpture, and on this 

 account I agree with Mr. Petterd in grouping H. questiosa 

 (Cox), and H. Margatensis under it, as undoubtedly there 

 are no specific characters to distinguish them from each 

 other. 



H. Fordei (Br.) — This sliell is also most variable in size, 

 colour, and sculpture, and I do not see how H. tabescens, H. 

 .Petterdi, H. Aliporti, H. austrinus, H. medianus, and H. 

 helice can be specifically separated from it. Their differences 



