MUSEUM OF COMPARATIVE ZOOLOGY. 187 



fornia. A glance at the map will show how widely separated greographically 

 H. Coloradoensis is from its nearest allies, and this discovery of Dr. Merriani's 

 extends the distribution of the West Coast type of Helices farther to the eastward 

 than heretofore, and adds an area of great extent to that previously known. 



The above description and figure were published by Steams in Proc. U. S. 

 Nat. Mus., Vol. XIII. p. 206, Plate XV. Fig. 6, 7, 8, 1890, all copied above. 



I have examined the jaw and lingual dentition to find them similar to those 

 of the other species of Arionta. 



Arionta Traski, var. proles, Hemphill. 



Shell umbilicated, very much depressed, thin, shining, of a dark horn-color ; 

 whorls 5i, somewhat flattened above, convex beneath, the last slightly falling in 

 front, with a dark band above the periphery, and crowded with strong obhque 

 striae ; suture well impressed ; umbilicus moderately large and deep ; aperture 

 hardly oblique ; peristome simple, thin, subreflected, its terminations approaching. 

 Height f inch, breadth | inch. 



Tulare Co., California, near Eraser's Mill. 



A much flatter and more depressed form than any of the varieties of Traski that 

 I have seen. There are no revolving microscopical lines, as in Traski. 



The above is Mr. Hemphill's description. 



Arionta tudiciilata, var. Tularensis, Hemphill. 



Shell umbilicated, very thin and frail, shining, of a light greenish horn-color, 

 globosely depressed ; whorls 5J, convex, the surface minutely granulated, and 

 crowded with fine oblique stride, with a single chestnut revolving band ; suture 

 well impressed; umbilicus very small; aperture oblique, subcircular; peristome 

 simple, hardly thickened, its columellar portion expanding and nearly covering the 

 small umbilicus. Height f inch, breadth | inch. 



Tulare Co., California. 



This is one of those puzzling intermediate forms uniting two species that can be 

 with equal propriety placed in one or the other. It has the exact form of the 

 typical Traski found at Los Angeles, and along the coast, though much smaller 

 and thinner, and it has the sculpturing of tudiculata much modified. It seems to 

 fill the gap quite completely between those two species. 



The above is Mr. Hemphill's description. 



Arionta tudictilata, Binnet. 



Plate II. Fig. 7, 8. 



New figures are here given of the form cypreophila. 



In The Nautilus, Vol. IV. p. 41, 1890, Mr. Hemphill also describes a 

 var. subdolus thus : — 



