114 A MANUAL OF AMERICAN LAND SHELLS. 



Ammonitella Yateaii, J. G. Cooper, Am. Jouru. Conch., iv, 209, pi, xviii, figs. 1-14, 



figure reversed (1869). 

 GonoHtoma Tatesi, W. G. Binney, Ter. Moll., v, 262. 



In the Califoruia Kegion, in Calaveras County, California, at Cave 

 City. 

 TLe si)ecimen figured is authentic. 

 Jaw and lingual membrane: see above, p. 113. 

 Genitalia unobserved. 



POLYGYRA. (See below.) 



Polygyra Harfordiana, J. G. Cooper. 



Shell umbilicated, depressed- globose, thin, surface scarcely broken 

 by incremental wrinkles, horn-colored; spire slightly 



® elevated, apex obtuse; whorls 4, convex, the last 

 globose below; suture impressed, aperture oblique, 

 lunate, trilobed, one tooth on the parietal wall and 

 p. Harfordmna. ^^^ ^^^ ^j^^ reflected peristome ; peristome white, 

 broad, reflected, with a tooth-like process near either termination 

 Greater diameter 9, lesser 6 """; height, 3"™. 



Helix Harfordiana, J. G. Cooper, Anier. Journ. Conch., v, 196, pi. xvii, fig. 3(1870). 

 Triodopsis Harfordiana, W. G. BIN^-EY, Terr. Moll., v, 309, exclus. fig. 203. 



In the Californian Province, in Fresno County, " Big Trees," latitude 

 370, G,500 feet altitude. 



Jaw, lingual dentition, and genitalia unknown. The figure given 

 above is drawn from Dr. Cooper's type in Academy of Natural Sciences 

 at Philadelphia. Dr. Cooper pronounces the shell formerly figured by 

 me to be the small form of Mesodon devius. This last furnished the jaw 

 and lingual membrane described in Terr. Moll., V. Dr. Cooper says the 

 true P. Harfordiana is not found in Idaho. 



The species seems much more nearly related to Polygyra than to 

 Triodopsis. It was described by Dr. Cooper as DccdalocMla, a section 

 of Polygyra. 



STEJVOTREMA. (See below.) 



Stcnotrcina g:eriiiaiiuin, Gould. 



Shell imperforate, solid, depressed, low-conical above, convex be- 

 FiG. 82. iieath, slightly angular at periphery, covered with a scabrous, 

 rusty, horn-colored epidermis, beset with scattered hairs; 

 whorls 5.J, closely revolving, separated by a well-impressed 



S.ger- 



munum. suturc ; aperturc lunate, the basal portion being but slightly 



