MUSEUM OF COMPARATIVE ZOOLOGY. lol 



luargin of the foot and caudal luucus-poro, over -wliich is a hump-like process : 

 no distinct locomotive disk: external respiratory and anal orifices at the central 

 right margin of the mantle : orifice of combined genital system near the right- 

 eye-peduncle. 



Shell-plate horny, small, unguiform, longer than wide, with posterior nucleus 

 and concentric lines of growth, exposed in part. 



Jaw ribl)ed. 



Lingual membrane with tricuspid central teeth, bicuspid laterals, and quad- 

 rate marginals. 



Coast of Oregon. 



The swollen central portion of the animal seems the first approach to a tur- 

 binate mass of viscera, separated from the foot. 



This emended generic description is drawn from larger specimens (40 mm. 

 contracted in alcohol) collected at Portland, Oregon, by Mr. H. Hemi>liill. 

 Found also at Tacoma, Puget Sound, and Olympia, Washington Territory, by 

 the same collector. 



Polygyra auriculata, Sat. (p. 263.) 

 Cedar Keys : St. George's Island, Florida. 



Polygyra Texasiana, Moricand. (p. 270.) 

 Fort Gibson, Indian Territory. 



Polygyra Dorfeuilliana, Lea. (p. 278.) 



Fort Gil»son, Clierokee Nation, Indian Territory : Alexandria, Louisana. 

 Wetherl)y suggests the specific name of Sampsoni for tlie variety described 

 in V(j1. V. 



Polygyra pustuloides, Bland, (p. 287.) 

 Lookout Mountain, Tennessee. 



Polygyra leporina, Gould, (p. 288.) 

 Fort Gibson, Indian Territory. 



Polygyra Harfordiana, -T. G. Coopkr. (p. 309.) 



Fig. 20?) is said liy Dr. f'noiier not to roprosciit liis spocifs, but ratlier tlie 

 Salmon Itiver small form nf Moiudnn iJtrin var. Mullani. 1 have, tliercfire, 

 here given a figure of Dr. Codjier's original ty]H' df 

 D. Harfordiana preserved at the Academy of Natural 

 Sciences at Philadelphia. Tlie species from this seems '^SL^aa.^J 

 more nearly allied tn Pi4ijq)jra than tn Triod'^pxiii. 



