294 



WEST COAST SHELLS 



Fig. 285, X ? (*) 



The shells are so very small that only a few of them 

 will be mentioned. 



H ol o s pir a arizonensis^ 

 Stearns, the Arizona Pupa, is 

 shown in a magnified form in 

 Figure 285. The shell is 

 really but half an inch long; 

 the figure, however, brings 

 out the details of its struc- 

 ture. In color it varies from 

 dingy-white to pale-horn. It 

 was collected at Dos Cabezas, 

 Arizona. 



Some of the species of the 

 old genus Fupa are now known as Bifid aria ^ among 

 which we may mention Bifid aria armifera^ Say, the 

 Armored Pupa. This species is found all through 

 the East; it has also been collected in New Mexico. 

 It is relatively quite large, being from 2 to 4 mm. 

 in length. It resembles Figure 284, but has six or 

 seven whorls, and the aperture is almost filled with 

 projecting teeth. 



Figure 286 gives a view of the shell of 

 Succinea ovalis^ var. haydeni^ W. G. B., 

 Haycfen's Amber-snail. In general it may 

 be said that the Amber-snails are rather 

 small mollusks, which love moisture, though 

 they do not often enter the water. The 3'el- 

 lowish shell of this species is long, thin, and 

 few-whorled. The a|)erture is very large and from 

 its base you can look inside the shell to its very apex. 

 The spire is small and consists of three delicate 



Fig. 286 



