MUSEUM OF COMPARATIVE ZOOLOGY. 185 



aperture lunate, well rounded, and nearly circular; peristome reflected, rounded ir 

 front, the margins joined by a triangular tooth on the parietal wall. Greater diam- 

 eter 6 mm., altitude 5 mm. 



Oyster Bay, Florida. 



This is a small, very elevated form of the P. cereolus group. 



The above is Mr. Hemphill's description. 



Mesodon ptychophorus, A. D. Brown, var. castaneus, Hemphill. 



Shell umbilicated, globosely depressed, of a dark chestnut color ; surface covered 

 with coarse, irregular, widely separated lines of growth, and crowded, microscopical 

 revolving lines; whorls 5^, convex, the last slightly descending in front, spire ele- 

 vated ; suture well impressed, aperture subcircular ; hp white, reflected and par- 

 tially covering the umbilicus, its terminations approaching; umbilicus small and 

 deep. Height f inch, diameter 1 inch. 



Old Mission and Rathdrum, Idaho. 



I regard H. ptychophorus as the progenitor of what I call the Townsendiina group 

 of West Coast land shells, and this colored variety seems to still further indicate 

 its relationship to Townsendiana, for the spire whorls of nearly all the specimens 

 of Townsendiana that I have collected are chestnut-colored. Townsendiana does not 

 begin to put on its wrinkles until it has made about four revolutions of the shell. 

 The wrinkles are probably due to its environment. 



The above is Hemphill's description, from The Nautilus, "Vol. IV. p. 41, 

 1890. 



Aglaja fidelis, var. flavus, Hemphill. 



Shell umbilicated, elevated, very faintly subcarinated, of a uniform light yellow 

 color throughout, without bands or other stains of coloring; whorls 6i, convex, with 

 coarse oblique striae, and microscopic irregular revolving lines; peristome reflected 

 below, simple above ; aperture roundly ovate ; umbilicus moderate, and partiallj' 

 covered by the reflected peristome ; suture distinct. Greater diameter 34 mm., alti- 

 tude 23 mm. 



Chehalis and San Juan Islands, Washington ; Port Orford, Oregon. 



This is a rare and beautiful variety of this well known West Coast land snail. 



The above is Mr. Hemphill's description. 



Aglaja fidelis, var. subcarinata, Hemphill. 



Shell orbicularly depressed ; umbilicated; ofa deep dark chestnut-color withotit 

 bands ; whorls 6^, convex or somewhat flattened, the last subcarinated at the 

 periphery ; striae coarse, oblique, crossed by numerous well defined wavy revolving 

 lines ; peristome simple, thickened above, reflected below, and nearly covering the 

 umbilicus ; umbilicus moderate ; aperture roundly ovate ; suture well impressed. 

 Greater diameter 37 mm., altitude 20 mm. 



Humboldt Co., California. 



