90 THE NAUTII.LS. 



basal lip, vvliicli hicks the long tooth of appressii and perigraptu, or 

 has only the slightest vestige of it. P. a. tryoniana differs from P. 

 wheatJeyi in the more depressed body-whorl with a tendency to angu- 

 lation, the larger parietal tooth and especially in the sculpture. P. 

 wheatleyi has small sharp raised points scattered over^the upper sur- 

 face and in the more delicate specimens upon the base also, and 

 while some spiral lines may be seen on the base in some specimens, 

 they are very weakly developed. In P. tryoniana there is no trace 

 of hair-bases or points, the sculpture being like that of P. appressa 

 perigrapta. 



Polygyra wheatleyi clingmanica n. subsp. 



Shell small, thin and fragile, somewliat transparent, pale. The 

 glossy surface is set throughout (except- near the apex) with short 

 delicate hairs, readily removed and often in large part lost from old 

 or cleaned shells. The rib-strite of the typical form are much weak- 

 ened or nearly effaced. Lip narrow, no parietal tooth. Alt. 8.7 

 diam., 13 mm. 



Near the summit of Clingman Dome, Great Smoky Mountains. 

 Types no. 77616 A. N. S. P., collected by Messrs. Ferriss, Clapp, 

 Walker, Sargent and the author, 1899. 



This form was noticed by me, Proc. A. N. S. Phila., 1900, p. 127. 

 It seems sufficiently differentiated from the typical form of xoheatleyi 

 from Cherokee Co., N. C, from the more solid form prevalent in 

 tlie Great Smoky Mts., generally, and from the form of Roan Mt., 

 to require a special name. It was found from the summit of Cling- 

 man Dome to our camp at the " Balsams," near the western end of 

 the mountain. Lower down, tlie ordinary P. wheatleyi replaces It. 

 It is analogous to P. andretosse altivaga. 



AGRIOLIMAX AGRESTIS IN COLORADO. 



BY T. D. A. COCKERKLL. 



To-day, October 25, 1004, I was surprised to find Agriolimax 

 agrestis in abundance in a vacant lot in the town of Boulder, Colo- 

 rado. This is the first indication of the establishment of this slug in 

 the Rocky Mountain region. The specimens are much darker than 

 those one (^-dinarily finds in England, and those I collected are re- 

 feralile to the foUowiii": mutations: 



