MUSEUM OF COMPARATIVE ZOOLOGY. 151 
margin of the foot and caudal mucus-pore, over which 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 ribbed. 
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. Hemphill. 
Found also at Tacoma, Puget Sound, and Olympia, Washington Territory, by 
the same collector. 
Polygyra auriculata, Say. (p. 263.) 
Cedar Keys: St. George’s Island, Florida. 
Polygyra Texasiana, Moricanp. (p. 270.) 
Fort Gibson, Indian Territory. 
Polygyra Dorfeuilliana, Lea. (p. 278.) 
Fort Gibson, Cherokee Nation, Indian Territory : Alexandria, Louisana. 
Wetherby suggests the specific name of Sampsoni for the variety described 
in Vol. V. 
Polygyra pustuloides, Brann. (p. 287.) 
Lookout Mountain, Tennessee. 
Polygyra leporina, Goutp. (p. 288.) 
Fort Gibson, Indian Territory. 
Polygyra Harfordiana, J. G. Coorrr. (p. 309.) 
Fig. 203 is said by Dr. Cooper not to represent his species, but rather the 
Salmon River small form of Mesodon devia var. Mullani. I have, therefore, 
here given a figure of Dr. Cooper’s original type of 
D. Harfordiana preserved at the Academy of Natural 
Sciences at Philadelphia. The species from this seems 
more nearly allied to Polygyra than to Triodoupsis. 
