OF NORTH AMERICA. 349 



TYPE LOCALITY : Poland, Ohio. 



ANIMAL, JAW, RADULA and GENITALIA : Not examined. 



RANGE: (Figure 40) Ohio west to South Dakota, northern Michi- 

 gan south to northern Illinois. 



Kirtlandiana occupies a large part of the humid division of the 

 Transition and Upper Austral life zones, extending northward into the 

 Boreal (Canadian) life zone (in Michigan). Kirtlandiana appears to 

 be of more northern distribution than exilis. It is confined to the 

 Canadian and Upper Mississippian regions. 



RECORDS. 



ILLINOIS: Mud Lake, Grand Crossing, Chicago, Cook Co. (Baker); Berry 

 Lake, Cook Co. (Higley) ; Crystal Lake, McHenry Co. (Nason). 

 MICHIGAN: St. Mary's River, Chippewa Co. (Walker). 



Distribution of 

 KIRTLANDIANA 



ROWELLJI 



FIG. 40. 



OHIO: Portage Co. (Dean); Garrettsville, Portage Co. (Hinkley; 

 Walker); Poland, Mahoning Co. (Kirtland; Lea; Walker); pond, Stone Creek, 

 near New Philadelphia, Ohio, Tuscarawas Co. (Sterki). 



SOUTH DAKOTA: Big Sioux River (Lea). 



GEOLOGICAL RANGE: Unknown. 



ECOLOGY : Kirtlandiana is characteristic of small bodies of water, 

 especially those that may become dry in the summer. 



REMARKS: Kirtlandiana is related to several species, but appears 

 to be recognizable. The whorls are not as flat-sided nor as oblique 

 as are those of exilis, nor has the aperture the distinct twist ; it is also 

 slightly perforate while exilis is not. It may be known from lanceata 

 by its much narrower, more elongate shell, more turreted whorls, and 



