1918.] NATURAL SCIENCES OF PHILADELPHIA. 305 



is a narrow but moderately high erest close behind the outer lip. The 

 color is chestnut-brown, becoming paler towards the apex. When alive 

 both animal and shell are black. Teeth fine, a small supraparietal 

 denticle being developed. The parietal and lower palatal folds are 

 rather large. Length 2.6, diam. 1.35 mm.; 5^ whorls. 



Except in external sculpture, this form resembles V. modesta from 

 Alaska, figured in Proc. A. N. S. Phila. for 1900, pi. 23, fig. 2. By its 

 sharp striation V. vi. insculpta is quite distinct from all other large 

 Vertigos of the Rocky Mountains, but there is a smaller form of V. 

 modesta in Labrador which is striate on the spire. 



It is very abundant between 9,000 and 9,500 ft. on Mt. Lemon, 

 in and near the aspen zone, where several hundred specimens were 

 collected. 



Ver}^ beautiful albino specimens occurred in the colonies from Sta- 

 tions 30, 31, and 37, Mt. Lemon. 



Other localities for V. m. insculpta are: Santa Catalina Moun- 

 tains: Soldier Camp. Mt. Lemon at Stations 19, 22, 28, 30, 31, 

 34, 37, at 8,500 to 9,500 ft. 



Vertigo coloradensis inserta Pils. 



In the original V. c. basidens from Bland, New Mexico, there is 

 one parietal tooth and the basal is at the foot of the columella, re- 

 mote from the lower palatal. In the Santa Catalina series there is 

 often a small angular lamella, and the basal fold stands close to 

 the lower palatal. 



This form replaces V. c. basidens in the Canadian zone of the Santa 

 Catalinas. The type is from Bear Wallow. 



Santa CataUna Mountains: Desert Laboratory plantation, 8,500 

 ft.; Bear Wallow Creek, 8,500 ft.; Soldier Camp. Mt. Lemon at 

 Stations 19, 22, 28, 31, 9,000 to 9,500 ft.; Alder Springs. Rincon 

 Mountains at Station 20. 



V. c. inserta differs from V. c. arizonensis by the development of a 

 basal fold, and all of the teeth are larger. 



Recent studies of the group have convinced us that Vertigo Colum- 

 biana utahensis Sterki is identical with V. coloradensis Ckll. The 

 former name is therefore superfluous. Our record of V. c. iitahensis 

 from the Chiricahua Mountains, in these Proceedings for 1910, 

 p. 144, should be changed to V. coloradensis. 



ANCYLID^ 

 Gundlachia californica Rowell. 



Santa Catalina Mountains: Sabino Canyon, at Alkali Spring, 

 Lowell U. S. Ranger Station, on leaves of Plantinus wrighti. 



