186 ZONITES. 



II. OADUCA, Pfr. PI. 55, figs. 49-51. 



Narrowly umbilicated, rather fragile, lightly wrinided r striate, 

 yellowish or orange corneous, often narrow!}- chestnut-lined at 

 the impressed suture; whorls 51, rapidly increasing, the last 

 much wider and dilated towards the aperture. Diarn. 27 mill. 



Mexico , Texas. 



Is somewhat more depressed than //. lucubrata, but may be 

 only a variety of that species. 



Yar. FASCTATA, Crosse and Fischer. Fig. 49. 



Shell larger, the suture distinctly banded with chestnut, ex- 

 tending on the body-whorl as a band above the periphery. 

 Diam. 31'5 mill. 



H. ANGIOMPIIALA, Strebel. PL 55, figs. 52-54. 



Moderately umbilicated, thin, shining, yellowish brown or 

 orange-brown, lighter on the base, where it is often somewhat 

 olivaceous, suture narrowly chestnut banded, with another band 

 above the periphery, costulate-striate, more distinct at the suture ; 

 whorls 5J, rather rapidly increasing, a little obliquely flattened 



above, the base more convex. Diam. 20 mill. 



Mexico. 



Is said to be darker colored, more shining, more depressed and 

 with finer sculpture than the banded var. of H. caduca, yet I 

 suspect that it will prove to be identical with it. 



II. METONOMASTICA, Crosse and Fischer. PI. 55, figs. 55, 50. 



Moderately umbilicated, thin, diaphanous, silky and closely 

 costulate striate above, smoother and polished below, ye\\o wish 

 corneous, with a narrow chestnut superiorly yellow margined 



band above the periphery. Diam. 25 mill. 



Mexico. 



Described as Helix Zonites by Pfeiffer, and the name altered 

 by Crosse and Fischer on account of its being a member of the 

 genus Zonites. The necessity for the change is questionable. 



Yar.'/9. Major. Diam. 32 mill. 



Yar. f. Dark colored, with the peripheral zone and umbilical 

 area lio-hter. 



