464 



NOTES AND EXHIBITS 



Messrs. Maiden and Baker exhibited interesting collections of 

 plants in illustration of their papers. 



Mr. Hediey read the followmg Conchological Notes : — 

 "In discussing Gundlachia beddmnei, in the last Volume of these 

 Proceedings I treated it as an undescribed species. Miss Lodder, 

 the well-known Tasmanian conchologist, kindly reminds me that 

 it was both figured and described by Petterd, Proc. Roy. Soc. 

 Tasmania, 1887 (1888), p. 41, PL xliv. Dr. Dall writes to me 

 that he doubts whether Gundlachia be a genus at all, suspecting 

 it to be a form assumed by winter survived Ancylas ; no other 

 hypothesis explaining to him its sporadic occurrence. Against 

 this I would balance the objection that in Europe, the best 

 searched division of the globe, Ancylus has not yet been observed 

 to sport Gundlachia. My statement on p. 513 that Gundlachia 

 differed anatomically from Aiicylus by a distinct pattern of 

 radula, was based on figs. 231, 249, and 253 of the Smithsonian 

 Miscellaneous Collection, No. 143. An additional illustration of 

 Gundlachia dentition from Mr. Suter's pencil appears on PI. xiv. 

 Vol. XXVI., Trans. N.Z. Institute. In support of the affinity of 

 American fluviatile mollusca to Australasian, I have collected the 

 following additional evidence. White has recorded Melanopsis 

 (Proc. U.S. Nat. Museum, 1882, v. p. 96 PI. iv. ff. 9, 10) as 

 fossil from the Laramie of Colorado, and Latia {op. cit. p. 100, 

 PI. V. ff. 17, 20) from the Miocene of Nevada. In America 

 Lyogyrus contains three species, L. pfipoides, Gould ; L. brownii, 

 Carpenter ; and L. dalli, Pilsbry and Beecher ; to this genus I 

 have referred (ante, Vol. vii. p. 373) the Queensland anodonta, 

 the only other known member being L. perroquini, Crosse, from 

 New Caledonia. For a comparison of Unio embryos from New 

 Zealand and S. America see "The New Zealand Journal of 

 Science," Nov. 1891, pp. 250, 254. 



" Mr. C. E. Beddome recently lent to me for study authentic 

 examples of Liotia tasmanica, T. Woods, described in Proc. Roy. 



