MUSEUM OF COMPARATIVE ZOOLOGY. 169 



Miss Law thus wrote from Philadelphia, Tenn., of this species: "Unlike 

 gularis, it seems to be a rare shell, and I find it only by scraping off the sur- 

 face of the ground in the vicinity of damp mossy rocks. Its habits are more 

 like placentula than gularis. I never mistake one for a gularis, even before 

 picking it up ; the thickened yellow splotch near the lip, and the thinner spot 

 behind, showing the dark animal through it, as well as its more globular form, 

 particularly on the base, make it look very different when alive." 



Zonites macilentus, Shuttl. 



Plate III. Fig. 3. 



The individuals of this group are very often difficult to identify, on account 

 of the blending of their specific characters. The typical macilentus is distin- 

 guished by a very wide umbilicus and a single revolving lamina starting from 

 near the basal termination of the peristome. The figure of macilentus in Vol- 

 ume V. shows a second revolving lamina and a much smaller umbilicus. I 

 give here another figure of what appears to me to be the shell described as 

 macilentus. How constant are the characters of the species can be shown only 

 by a large suite of individuals. 



Tebennophorus Hemphilli. 



< Plate III. Fig. 4. 



I give a figure of the jaw already described by me. 



Patula strigosa, Gould, var. jugalis, Hemphill. 



Shell umbilicated, depressed with numerous prominent oblique striae ; spire very 

 moderately elevated or depressed ; whorls b^, somewhat flattened above, but more 

 convex beneath, the last falling in front, with two dark revolving bands, one at the 

 periphery and the other above ; the body whorl subcarinated at its beginning, but 

 more rounded as it approaches the aperture ; suture well impressed ; color ashy 

 white, with occasional horn-colored stains ; umbilicus large, pervious, showing the 

 volutions ; aperture oblique, ovate, but in very depressed specimens the aperture 

 is at right angles with the axis of the shell ; peristome simple, thickened, its ter- 

 minations approaching and joined by a thick heavy callus, making the peristome 

 in very adult specimens contiimous. Height of the largest specimens ^ inch, 

 breadth 1 inch. Height of the smallest specimens -^ inch, breadth i^ inch. 



Patula strigosa, var. jugalis, Hemphill, The Nautilus, 1890, p. 134, in Binney's 

 3d Suppl., p. 215, figure. 



Banks of Salmon River, Idaho. 



This is another interesting form of the very variable strigosa. It inhabits stone 

 piles, and other places where it can find shelter and protection against the fatal 

 rays of the summer's sun, close along the banks of the river. It is interesting on 



