1905.] NATURAL SCIENCES OF PHILADELPHIA. 251 



Type locality, Chiricahua Mountains, southeastern Arizona, in Fly 

 Park, 10,000 feet altitude (Fischer); also in Cave Creek Canyon (Fcr- 

 riss, 1904). The locality "near Tucson" is also given for specimens 

 collected by a Mr. Cox, many years ago. ?Huachuca Mountains, in 

 Miller Canyon (see below). 



Dall's type measured, alt. 7.7, diam. 18 mm.^ Three topotypes of 

 the original lot collected by Fischer measure ; 



Alt. 9, diam. 18 mm.; whorls 5|. 

 " 8.5, " 16 " " 5*. 



Sixteen of the specimens collected by Mr. Ferriss in Cave Creek 

 Canyon (PI. 16, figs. 96-100) measure: 



The diameter curve from this small series has a strongly marked 

 mode at 18 mm. (44% of the whole), with a skew toward the smaller 

 diameter. 



There is a considerable variation in the height of the spire, shown 

 in the measm^ements above and in the figures, of which figs. 99 and 100 

 represent about the extremes of variation in this respect. 



Two specimens from the head of Miller Canyon, in the Huachucas, 

 measure 8.5 x 18.2 mm. and 8 x 16 mm. The smaller one is an albino, 

 greenish-white. These may be referable to A. levettei heterodonta, q. v. 



I have seen no Ashmunellas from Tucson, but no differential char- 

 acters have been indicated for the variety varicifera Ancey, from that 

 place. Nearly all the specimens from the Chiricahua range have 

 varices. 



The genital system (PI. XXI, fig. 29) is remarkable for the great 

 length of the epiphallus, vagina and spermatheca duct. The penis is 

 large and well developed. The specimens examined are from Cave 

 Creek Canyon, in the Chiricahuas. 



The jaw (PI. XXIII, fig. 13) is stronger than in most of the species, 

 with 8 strong ribs and several weaker ones. 



The radula (PI. XXII, figs. 10, central and lateral, and 11, groups of 

 transitional and marginal teeth) has 16.13.1.13.16 or 16.14.1.14.16 

 teeth. The thirteenth to fourteenth or fifteenth teeth are transitional. 



^ This measurement was not to the base of the lip, and hence is less than^in 

 the shells from the same lot measured by me. 



