1906.] NATURAL SCIENCES OF PHILADELPHIA. 149 



belongs to the same family, and probably Glessvla also, but the pallial 

 organs of that Indian genus are unknown. The group is not related to 

 the Achatinidce. 



Cochlicopa lubrica (Mull.). 



Bear Park and Cave creek canyon, Chiricahua mountains, and Fort 

 Bowie (Ferriss) ; Carr canyon, Huachuca mountains (Dr. H. Skin- 

 ner); all in Cochise county, Arizona. Drift debris of Pecos river^ 

 Pecos, New Mexico (Ckll.). 



ZONITIDiE. 



Omphalina extends to the western border of the Austroriparian 

 area in Texas. The form taken by us will be discussed in the conclud- 

 ing paper on Southwestern mollusks. 



Zonitoides minuscula (Binn.i. 



Texas: San Marcos, New Braunfels, near Hondo, Del Rio, Devil's 

 river and Pecos river. Everywhere common in drift debris. The 

 specimens all show a tendency to be more widely umbilicate than 

 typical Northern minuscula, a large part of them being typical Z. m. 

 alachuana (Dall). Those from San Marcos and Comal county are of 

 the size of Northern minuscula, but westward the shells reach a decid- 

 edly larger size, with the exception of the lot taken at Devil's river, 

 which show but little tendency towards a wide umbilicus. 



In Arizona, Ferriss took specimens of var. alachuana at Bear Park 

 and Cave creek canyon, Chiricahua mountains, in the drift of San 

 Pedro river at Benson, and in the Huachucas. Like other minutiae, 

 these shells are very rare in the Chiricahua and Huachuca mountains. 



Helix mauriniana Orb., from Cuba, which has been put in the 

 synonymy of minuscula, seems to be a Thysanophora close to or 

 identical with T. saxicola (Pfr.), as Arango has already stated. Z. 

 minuscula occurs also in Japan. 



Zonitoides minuscula neomexioana Pils and Ckll. 



This form is distinguished by the possession of minute and shallow 

 spiral striation. It seems to be of somewhat common occurrence in 

 New Mexico, and upon examining a set of seven specimens taken by 

 me in Galveston in 1885 I find that they are similarly sculptured. 

 They came from under boards in a lumber yard, and it may be that 

 they were brought from New Mexico with lumber, though I do not 

 know that any lumber was shipped from New Mexico twenty years 

 ago. 



