PACIFIC COAST SPECIES. 143 



Mr. A. W. Crawford, of Oakland, who has examples in liis collection; 

 specimens are also contained in the typical collection of my friends 

 Binney and liland and in my own musenm.* 



Most anthors would regard the above as a distinct and well-marked 

 species; I regard it (as well as H. HiUehramU of IS'ewxomb) as a va- 

 rietal form of Helix Mormonum, to which it is a near neighbor, inhabit- 

 ing the same region. 



Binney, in his last volume on "The Terrestrial Air-Breathing Mol- 

 lusks of the United States," &c., in referring to R. Mormonnm (on page 

 367), remarks : "The specimens lately received from Califoruia * * * 

 are singularly granulated on the first one and a half apical whorls, and 

 the epidermis of the next two or three whorls is sparingly ornamented 

 with small but very distinct raised lines or points, something like pros- 

 trate hairs, being part of and same color as the epidermis." I have 

 observed the same, but the points are not always epidermidal, but 

 sometimes sculpture the shell as well, and the peculiarity Binney has 

 detected is one of the connecting links between the three; as to the 

 other links, and the special and general relations of the species or va- 

 rieties cited to others of our California land-snails, I propose to discuss 

 the matter hereafter. (Stearns.) 



Arionta Traski Newcomb. 



Shell umbilicated, globosely depressed, very thin, translucent, d:irk 

 horn-colored, with a revolving chestnut band, doubly 

 edged with white; with delicate oblique strife and 

 crowded microscopic revolving lines; spire hardly ele- 

 vated, apex flattened ; whorls 6, slightly convex, gradu- 

 ally increasing, the last rather plane above, inflated 

 below, not falling before, banded above the middle; 

 umbilicus moderate, conical ; aperture very oblique, 

 Innately semicircular, banded within; peristome with ATr^iski. 



a white thickening, regularly rounding, its terminations joined by a 

 light transparent callus, that of the columellar widened, subreflected, 

 but not at all covering the umbilicus. Greater diameter 21, lesser 

 IG"'"- ; height, 9""". 



Helix Traskii, Newcomb, Proc. Cal. Acad. Nat. Sci., ii, 91 (1861). 

 Jglaja Traskii, Tryox, Am. Jonrn. Concli., ii, 314, pi. v, fig. 16 (1866). 

 Arionta Traski, W. G. Binney, Terr. Moll., v, 369. 

 Helix Franki, J. G. Cooper, err. typ. ; teste J. G. C. iu letters. 



In the Californiau Eegion. A coast species, ranging from Los 

 Angeles 50 miles to Fori Tejon, and to San Luis Obispo, 150 miles. 

 * Also iu the collection of the National Musenm. 



