THE NAUTILUS. 35 



I found this shell in a small slough near Edwards Creek, in Green 

 Township, adhering to flat limestone rocks. I have never found it 

 in any other locality. It is probably very rare here. 



GENERAL NOTES. 



On Helix (Arionta) Kelleti Fhs. — Twenty years ago, Dr. 

 J. G. Cooper, writing of the west coast helices, mentioned the find- 

 ing of Arionta KeUettli Fbs., u])(»n the seaward side of Point Loma, 

 at the entrance of San Diego bay. He remarked upon the great 

 number of dead shells and the scarcity of the living, from which it 

 was inferred that they were dying out. The same state of affaiis 

 exists to day. The steep hillside is thickly strewed with dead shells 

 of the form o^ Arionta Kellettii, now generally known as A. Stearn- 

 siana, while living specimens are hard to find. The dead shells are 

 in all stages, from fresh and bright to chalky and broken, showing 

 that a comparatively small number of individuals are living at one 

 time, yet enough survive to keep the race intact. — E. W. ROPER. 



PUBLICATIONS RECEIVED. 



Contributions for a systematic knowledge of the aquatic 

 SHELLS OF Tasmania, by W. F. Petterd. In this valuable paper 

 Mr. Petterd has revised the fresh-water shells of Tasmania, giving 

 especial attention to the minute Paludinoid forms, which in Tasmania 

 as everywhere have been very imperfectly understood. IMost of 

 them belong to the genus Potamopyrgus of Stimpson, a group in- 

 cluding also all of the New Zealand non-marine Kissoids. The new 

 subgenus Beddovieia (name preoccupied by Nevill, Handl. Moll. Ind. 

 Mas. i, p. 127) is proposed for Amnicola laiincestonensis Johnson, and 

 other species, and Brazieria for the Ampul/aria tasmanica Tenison- 

 Woods. A number of new species are described and figured as well 

 as the radula? of various genera. The importance of work of this 

 sort can hardly be over-estimated at the present stage of Malacology. 

 ^H. A. P. 



On certain parasites, commensals and domiciliares in the 

 PEARL OYSTER, by R. E. C. Stcarns. (Smithsonian Report, 1886, 

 pt. 1, p. 339.) The author of this paper discusses in characteristically 

 graceful style the interactions between parasites, domiciliares and. 



