Vol. X] BERRY—SOME UNDESCRIBED CALIFORNIAN HELICES 



59 



incised lines, barely to be detected on the third whorl, then 

 gradually increasing in strength to the penultimate whorl, but 

 again becoming very weak on the upper portion of the body 

 whorl, and nearly, though not quite, obsolete below. 



Measurements: 



Maximum Minimum Altitude Diameter Number of 

 diameter diameter umbilicus whorls 



mm. mm. mm. mm. 



WillettColl 31.6 26.2 18.8 3.8 6V2 



" 31.4 26.6 19.0 3.7 6V2 



" 30.3 25.1 18.4 3.3 6V3 



" 30.1 25.2 18.5 3.8 6V2 



" 29.7 24.5 18.2 3.2 6V3 



, " " 29.3 24.2 17.3 Z.7 6V3 



" 28.4 23.5 16.1 2>.7 6V2 



Berry Coll. 4498... 31.4 26.3 19.1 3.8 6V2 



Type 21.1 24.8 18.4 3.8 6V2 



Berry Coll. 4498... 29.4 24.6 18.0 3.2 6V3 



"... 29.+ 24.3 18.3 3.2 6V3 



Type: Cat. No. 4497, Berry Collection. Paratypes in pri- 

 vate collection of George Willett. 



Type Locality: Alt. 3500 ft.. Pine Canyon, Sespe Creek, 

 Ventura County, California; Geor§;e Willett, March 24, 1919; 

 dead but fresh shells of 10 adults, and 14 juvenals of various 

 stages, both living and dead, found in rock slides. One living 

 and three dead adults taken at same locality in 1916 or 1917. 



Remarks: The shell of this beautiful snail is easily the 

 largest, finest, and most richly colored of any of the traskii- 

 group. In some respects it reminds one of the large mountain 

 species, petricola, and like it has suffered a considerable reduc- 

 tion in the spiral sculpture usually so characteristic of the snails 

 of this group. Nevertheless I believe its relationships are 

 rather with the true traskii, an opinion which is fortified by the 

 color and general texture of the shell and periostracum, quite 

 different from the light, SonercUa-Wkt gloss of petricola. 



The majority of the specimens are in an excellent state of 

 preservation and are remarkably constant in their characters. 

 They appear to represent an unusually well marked race, not 

 especially near to any of the previously described subspecies. 



