vol,. XVI 



^'•] PROCEEDINGS OF THE NATIONAL MUSEUM. 381 



been detected, else I sliould regard that, also as an asi)e('t of nnx, be- 

 longing to the variety represented in the National <;olle('tiou by No, 

 118571. Of the protean nux, it will be noticed npon the examination 

 of lieibisch's list that he had only a few imperfect examples. Of 

 what value to the student is such limited material? 



24. BuliniuluB Jacobi f^by. 



Chatham Island; several examples f (Mus. No. 1-52005). Sowerby 

 figures (Conch. 111. 45,) both banded and bandless specimens. The 

 above number includes shells that are obs(;iirely banded (No. 122117 

 of the Museum series), and others that are distinctly banded. See 

 previous comm(;nts (under No. 2.'i) on Reeve's figure of Jacohi. 



25. Bulimulus rugulosus Slty., not rugulosus Kve. 



Charles Island; abundant (Mus. Nos. 122000, 122001). 



This form is apparently nearly as numerous as nux. Kcibisch refers 

 it to Chatham and does not credit it to Charles Island. On the former 

 he says " it is common on bushes, on the cliffs and under stones, at an 

 elevation of from 300 to 000 feet; this is the prevailing form on Chatham, 

 the same as hkx is on Cliarles." 



Ancey* has named two varieties of ruyulosus, namely infuseata and 

 planospira, both from Chatham Island examples. 



In one example (No. 122001) we have an approach to sculpturatus 

 Pfr. 



26. Bulimulus eschariferus Shy., non Reeve. 



Chatham Island, several exami)les (Mus. No. 422006). 



It was on this island that Darwin collected his specimens; the Petrel- 

 Cookson examples were detected on Charles Island. Of these, Mr. E. 

 A. Smith says : "The Charles Island shells are considerably larger than 

 those from the above locality [Chatham Island], and also coarser in 

 sculpture, some of them displaying spiral granose or rugose striation, 

 as in B. ruf/ulosu.s Sby., from the same islands, and, indeed, they appear 

 to be an intermediate variety or connecting link between the two 

 species, both as regards size and sculpture." 



Ancey t has named two varietal aspects of the foregoing, bizonalis 

 and suhconoidalis. 



27. Bulimulus (Pleuropyrgus) chemnitzioides Forbes. 



Chatham Island (Mus. No. 122004). 



Several examjjles of this interesting form, upon which Von Martens j: 

 based his genus rieuropijrgus^ were dete(;ted at Chatham Island. It 

 was here that Forbes's type was obtained; it is the only species in 



*Biill. Soc. Malac. France. Juillet, 1887, pp. 293-299. 



tld. 



t Albers die Heliceen, 2(1 ed., Leipzig, 1860, p. 221. 



