1 6 PROCEEDINGS OF THE CONCHOLOGICAL SOCIETY. 



"A List of Correspondents of the Smithsonian Institution, 



U.S.A." 



NEW MEMBERS. 



Geo. H. Parke, F.L.S., F.G.S., of Infield Lodge, Furness 

 Abbey, was nominated for membership. 



SPECIMENS EXHIBITED. 



The President exhibited a number of specimens of 

 Achatinella, remarking that the genus, of which about 228 

 species have been described, is peculiar to the Sandwich Isles. 

 Their distribution in these islands presents in a marked degree 

 the tendency which the species of oceanic islands, as opposed 

 to those of continental areas, have to vary to a very large extent. 

 Thus, the Achatinelline species are not merely restricted to 

 particular islands, but even to particular valleys or restricted 

 localities within the limits of any one island. Moreover, they 

 appear in some instances to be confined to particular species of 

 indigenous plants, and as the increasing civilization of the 

 islands is doing its usual share in the extermination of some of 

 the more local species of these plants, it is probable that their 

 species of Achatinelice will either die out or become further 

 modified from the change of the conditions under which they live. 

 Thus the genus affords good opportunities for the study of ten- 

 dencies to variation, and of the influence environment has upon 

 those tendencies. The following are the species exhibited: — 

 Achatmella rubiginosa Newc, A. Dunkeri Pfr., A diversa GuL, 

 A. gravida Fer., A. bacca Rve., A. Swiftii, A. castanea Rve., 

 A. auricula Fer., A. abbreviata Rve., A. lirata Fer., A. producta 

 Rve., A. turritella, A. olivacea Rve., A. pulcherrima^-^diAns:, A. 

 Johnsgnii Ne,wc., A. varia GuL, A. venAulus Fer., A. trilineata 

 GuL, A. i^urta, A. tceniolata Pfr., A. straminea Rve., A. virens 

 GuL, A. sanguinea Ne\yc., A. Stewartii GuL, and A.- adusta Rve., 

 all from Oahu; A. physa Newc, from Hawaii; A. biplicata 

 Newc, and A. crassa Newc, from Lauaij A. perdix Rve., and 

 A. affinis Newc, from Maui; A', virgulata Migh., A. polita 

 A. renista Migh., A. tesselata Newc, A. plicata Migh., A. rufa 



J.C, iv., January, 1883 



