THE NAUTILUS. 67 



*Lucapinella callomarginata, Cpr. Mostly worn shells. 



Megatebennus bimaculatus, Ball. In drift. 



Mopalia muscosa, Gld. Fine specimens. 



Mopalia ciliata, Sby. Several shells. 



Nuttallina scabru, Rve. On rocks. 



Ischiiochiton conspicuus Cpr. Under flat rocks. 



NOTES ON THE CONCHOLOGY OF POCONO MANOE, MONROE CO., PA. 



BY JOSHUA L. BAILY, JR. 



During the past summer it was my fortune to spend six weeks at 

 Mt. Pocono, Monroe Co., Pa., the largest mountain summer-resort 

 in Pennsylvania, and while there had an excellent opportunity to 

 explore the molluscan fauna of a region which has been neglected 

 by conchologists heretofore. The Pocono Inn, at which I stayed, 

 the only hotel on Pocono Manor, is located on Little Pocono Moun- 

 tain, about 1850 feet above sea-level. From the Inn a fine view 

 may be had on clear days of the Delaware Water Gap. Three miles 

 to the westward lies the source of Swiftwater Creek, which after 

 passing the falls, reaches Lake Minausin, about 500 feet below the 

 level of the Inn. On the other side of the mountain is a smaller 

 stream known as Indian Run, which flows into the Swiftwater 

 about a mile below the lake. The temperature of the water is 45 

 F. or lower, except in the lake, where the sun shines on it. Per- 

 haps this is why I have never been able to find any fresh-water 

 shells at all during four summers' collecting. And also, as implied 

 by the name, the water is so swift that no mud settles on the bed 

 rock, which is always clean. Shells there must be, somewhere, for I 

 have frequently found clusters of eggs adhering to the aquatic vege- 

 tation, which is very abundant; but although I have searched the 

 Swiftwater to its source, and the other stream nearly as far, I have 

 never been rewarded by finding any of our friends at home when I 

 called. Last year my brother found one specimen each of an unde- 

 termined Physa and Pisidium in Paradise Valley, but as this was 

 five miles from Pocono Manor I will not include them in the list. 



With respect to land forms, however, a greater variety is en- 

 countered. The country is exceptionally rocky, the predominating 

 rocks being red shale. The soil is very fertile, and in the woods the 



