354 petterd: woods "census of tasmanian shells." 



9. Gibbula multicarinata. 



This is but a very beach-worrx dead specimen of Clan- 

 ciilus nodo-liratiis, with the lip broken or not fully developed. 



10. Trochus AustraUs 



Is in all probability fully grown Gibbula depressa. 



11. Kraussia Atkinsoni 



Is but one of the varieties of K. Lamar'kiana, a variable 

 shell both as to shape and markings. 



The shell described as Gouldia Tasnianica^ in Pro, 

 Royal Soc. Tas., by Rev. T. Woods, for 1876, is but the free 

 fry of an undescribed species of Myochama that I have ob- 

 tained with the dredge at Long Bay parasitic on Pecten 

 fufnatus, as is shown by the umbones of a series in my collec- 

 tion which shows the gradual development, from the free 

 swimming form, till it obtains its mature growth on the 

 Pecten. Probably it is also to be found in other shells, but 

 hitherto I have only noticed it on the shell before mentioned. 

 In this case as the mature form is not described, perhaps it 

 may be as well to designate it Myochama tasmanica—Kellia 

 tasjiianica is omitted from the 'Census.' 



I cannot agree with the remarks of Mr. Woods in 'Census,' 

 in reference to the species of the genus Chiton. No doubt they 

 show great varieties in color according to age, and they may vary 

 much in growth and form according to the rock to which they 

 attach, or the various parts of the coast may have more or less 

 influence on their development. Nevertheless I consider the 

 number of species very great and as a rule extremely restricted in 

 their distribution, and that an individual species does not vary to 

 any great extent, or in fact more than any other species of mol- 

 lusk. Many other very distinct species are known to local 

 collectors here, besides those enumerated that have been obtained 

 in a living condition and not young or worn shells. In my 

 opinion Tasmania is rich in Chitons. 



