60 THE CHICAGO ACADEMY OF SCIENCES. 



demarcation extends northward across Maryland, including Delaware 

 and New Jersey south of the 40th parallel. 



15. Nova Scotian. This area includes the greater part of the 

 New England states, the southeastern portion of New York, the east- 

 central portion of Pennsylvania, northern New Jersey, Virginia, the 

 greater part of Maryland, the whole of Nova Scotia, New Brunswick, 

 and probably Newfoundland. The drainage is into the Atlantic Ocean. 

 Its southern limit is the Potomac River and the 10th parallel in New 

 Jersey. 



16. Central American. This includes all of Central America 

 from the Isthmus of Panama northward. It embraces all of Mexico 

 excepting the higher tableland, including Lower California, taking in 

 both the Pacific and Gulf coasts. The drainage is into the Pacific 

 Ocean on the west and into the Gulf of Mexico and the Caribbean 

 Sea on the east. It is possible that this area should be further sub- 

 divided, but too little is known of its aquatic pulmonate fauna to war- 

 rant such a course at present. 



17. West Indian. For the present purpose the islands of the 

 West Indies may constitute a single province, the Lymnseid fauna, so 

 far as recorded, being apparently the same in the different islands. 



18. Greenlandian. Little is definitely known concerning the 

 distribution of the Lymnseas in the region known as Baffin Land, and 

 the relation of this territory faunally to Greenland ; whatever this 

 relation may be ascertained to be, it seems advisable to institute a 

 faunal region for Greenland, at least. 



