AMBER-SNAILS. 129 



Succinea Nuttalliana, Lea, Nut-tal-li-an'-a. Whorls 

 somewhat more rounded than those of the last, and the 

 aperture wider in proportion to its length. Shell 

 light horn-colored, with distinct lines of growth, and 

 a little smaller than that of the last species. The 

 specimens were collected in Weber canon, Utah, but 

 it is said to occur also in California and Oregon. 



Succinea Sillimani, Bland, Sil-li-man'-i. The spire 

 of this shell, which w r as gathered near Stockton, Cal- 

 ifornia, is extremely short, and the aperture is very 

 large and does not narrow near the base. The shell 

 is so very thin that it is nearly transparent, and it has 

 but a trace of color. Its length is about half an inch. 



Succinea Oregoncnsis, Lea, Or-e-go-nen'-sis. Shell 

 yellowish, spiral whorls few and well rounded, body 

 whorl w T ide, aperture a perfect oval. Length about 

 half an inch. From near Los Angeles, but found in 

 other parts of California and in Oregon. 



Succinea Gadlrii,TTy on, is somewhat smaller. Spec- 

 imens from Brigham City, Utah, are considered by 

 Mr. Binney as a variety of the last species. 



Succinea Stretchiana, Bland, Strech-i-an'-a, has a 

 yellowish or greenish horn-colored shell, with few 

 whorls and a rounded aperture. The whole shell is 

 also quite full and rounded, and its length is less than 

 half an inch. It is a mountain species, the specimens 

 studied having been collected near Elko, Nevada. 



Fig. 119 shows the form of the little Succinea 

 arara, Say, a-va'-ra. The shell is horn-colored, and 

 very thin and delicate. The three spiral whorls 

 are rounded, the body-whorl of moderate size, 

 and the aperture is ovate. The length is a 

 quarter of an inch or more. Specimens before 

 Fig. it 9 . me are from the Salmon River mountains of 



(9) 



