WEST MEXICAN MOLLUSCA. 1 67 



Patui.a horni Gabb. 



The five specimens brought from Tepic do not differ 

 from the Arizona type, or from the one found on the pen- 

 insula. They differ from any alHed shell figured or de- 

 scribed as from Eastern Mexico. 



POLYGYRA HINDSI Pfeiffcr. 



Over fifty specimens were brought from Mazatlan, Te- 

 pic, etc., mostly fresh and full grown. All seem easily 

 distinguishable from the next in size, being mostly about 

 half as large, but there is a great difference in size among 

 these small shells, varying in about the same proportions 

 as the varieties of H. monodon called var. leai and var. 

 fraterna as figured by Binney. 



PoLYGYRA VENTROSULA Pfeiffcr. 



Twenty-two specimens from the same region are about 

 twice the size of the preceding. Both forms show speci- 

 mens having a broad pale band on top of the body-whorl, 

 while a narrow dark one runs along the suture and a 

 wider one near the periphery, which in some becomes a 

 reddish brown color covering the whole under surface of 

 the shell. Generally these colors are faint or faded out, 

 and they do not seem to have been described before. 



SuBULiNA ocTONA Chemnitz. 



Twenty-two from San Bias seem to be of this species, 

 which is said to range over most of tropical America and 

 adjacent islands. 



SUBULINA LIRIFERA? Morelct. 



Seventy or more of a scalariform species from Tepic 

 approach nearest to this species, which, however, was 

 described as from Guatemala ovXy . It is probably con- 

 tained in the collections obtained from Tepic by the au- 

 thors of Biol. Centrali-Americana, and I therefore defer 

 its identification until the results of their study of this 

 genus are printed. 



