58 THE NAUTILUS. 



not discovered until too late to be corrected in the original publi- 

 cation. 



The localities of the two species were reversed and the proper 

 credit was not given for the discovery of V- approxima. The types 

 of that species were not collected by Ferriss and Walker and did 

 not come from Wilson's Cove. They were collected by Henry 

 Hemphill many years before and were distributed by him as " V. 

 wheatleyi Bid." As Hemphill's stay on Mt. Mitchell was very 

 limited (See Proc. P. A. N. S. 1900, page 149) they were no doubt 

 collected either along the trail to the summit or on Mt. Mitchell 

 itself. Collectors who received specimens from Hemphill as V. 

 wheatleyi would do well to reexamine them carefully. 



V. vanattai was collected by Walker in Wilson's Cove. 



SUBSPECIES, MUTATIONS AND FORMS. 



BY T. D. A. COCKERELL. 



Messrs. Pilsbry and Ferriss in discussing the variations of Bul- 

 imnlus alternates (Proc. Acad. Nat. Sci. Phila., 1906, p. 140) 

 say: " we can find no ground for dividing them [the different forms 

 of subsp. marice~\ into several races, as Prof. Cockerell proposes." 



It seems opportune to protest against this interpretation of my 

 paper of 1891; the more so, since Prof. Pilsbry has before tried to 

 insist upon the erroneous nature of my proposed classification. 

 There is not, and never has been, the least divergence of opinion as 

 to the actual facts. In 1891, of course, we did not know as much 

 about the. subject as we do to-day, thanks to the excellent re- 

 searches of Messrs. Pilsbry and Ferriss; but now, as before, the 

 objections to my nomenclature have no valid basis, except in a mere 

 difference of opinion as to what should receive a name. 



I grew up in England, accustomed to the methods of the Jeffrey- 

 sian school, which paid little attention to slightly differentiated races, 

 but bestowed names on all sporadic or individual variations which 

 were striking enough to be easily recognized. Professor Pilsbry 

 pays little attention to sporadic variations, but is very much in- 

 terested in geographical races or subspecies. It was undoubtedly a 



