1894.] NATURAL SCIENCES OF PHILADELPHIA. 269 



Septembkr 4. 

 Mr. Charles Morris in the chaix-. 

 Twenty-three persons present. 



September 11. 



Mr. Charles P. Perot in the chair. 



Nineteen persons present. 



The death of H. T. Cresson, September 6, 1894, was announced. 



September 18. 

 Mr. Charles Morris in the chair. 

 Twenty- five persons present. 



September 25. 

 Mr. Charles P. Perot in the chair. 



Twenty-nine persons present. 



Papers under the following titles were presented for publica- 

 tion : — 



"Descriptions of a New Subgenus and New Species of Arvicoline 

 Rodents from British Columbia and Washington," by Samuel N. 

 Rhoads. 



"Recent Mound Exploration in Ohio," by Clarence B. Moore. 



"List of the Diptera of Jamaica, with Descriptions of New 

 Species," by Charles W. Johnson. 



Observations on Blarina brevieauda. — Dr. Harrison Allen 

 drew attention to several structural features in this animal. The 

 lower jaw articulates with the skull, not only by the tem])oro- 

 mandil)u]ar joint, but by a sphenoido-maudibular. The one last 

 named was described as being much the larger and apparently more 

 important of the two. The mandibular surface is placed on the inner 

 side of the ascending ramus, and the sphenoidal surface is situated at 



