1901.] NATURAL SCIENCES OF PHILADELPHIA. 607 



come from both sides of the narrow estuary, the accumulated thick- 

 ness of the beds must have been far greater, perhaps six times 

 greater, than it would have been with equally far-reaching and 

 rapid drainage on the single shore of an ocean where the sediments 

 would be carried three times as far from land. This consideration 

 may make belief in the thoroughly demonstrated great thickness of 

 the New Red in Montgomery county a little easier to those, if any 

 there be, who still fondly cling to the old purely conjectural esti- 

 mates. 



December 10. 

 The President, Samuel G. Dixon, M.D,, in the Chair. 



Twelve persons present. 



Papers under the following titles were presented for publication: 

 " Additions to the Japanese Land Snail Fauna, V," by Henry 



A. Pilsbry. 



" Catalogue of the Clausiliid?e of the Japanese Empire," by 



Henry A. Pilsbry. 



December 17. 

 Mr. Charles ^Morris in the Chair. 



Twelve persons present. 



The deaths of William F. Norris, M.D., and Rush S. Huide- 

 koper, M.D., members, were announced. 



December 24. 

 Mr. Charles Morris in the Chair. 



Seven persons present. 



Papers under the following titles were presented for publication : 

 " On the Common Brown Bats of Peninsular Florida and 

 Southern California," by S. N. Rhoads, 



