92 THE NAUTILUS. 



him happy over the plentifulness of the Naiades ; they made up in 

 this and in new interest what they lacked in variety. The most 

 striking fact was that while Eurynia vanuxemensis (Lea), was un- 

 known to the Clinch, it was one of the most common species of the 

 Powell, at least at this station. Jo was not seen. Two specimens 

 only of Anculosa subglobosa were collected. Pleurocera unciale, of 

 a heavier aspect than the species in the Clinch, and Goniobasis 

 simplex were common. In flood pools, I was lucky enough to make 

 several interesting finds : Physa crandalli Baker, Planorbis bicari- 

 natus Say, Lymncea obrussa Say, and, best of all, Ancylus obscurus 

 Hald., which Mr. Walker tells me has been one of the long-lost species. 



The weather turning stormy, we regretfully gave up plans for 

 further collecting in the Powell river and in shoals of the Clinch 

 which could be conveniently reached from Big Stone Gap. So in 

 hopes of getting out of what might happen to be a localized storm 

 area, we went on to Gate City, Scott Co., which brought us into the 

 Holston drainage. Though assured thai no shells had ever been 

 seen in the Little Moccasin, which runs as a sort of decorative 

 border to the corporation of Gate City, the results proved, as they 

 usually do in such cases, that the resident sense of observation was 

 of indifferent development. Two species of Naiades were found in 

 this stream and, had the creek been clearer, probably more had 

 been collected. The purple-black Goniobasis spinella Lea, was an 

 easy mark in the yellow water, and many specimens were taken. 

 The ubiquitous Pleurocera unciale was here and also Goniobasis 

 clavseformis Lea, a species new to the expedition. Physa hetero- 

 stropha Say, covered the wooden sides of the flume of a grist mill 

 run by this creek. 



Following the Little Moccasin slowly down stream, we came to 

 the Big Moccasin creek. Almost at once Dr. Ortmann struck a 

 pocket of clams and in the course of a few minutes had taken seven 

 specimens. But luck quickly deserted, a thunder shower forcing us 

 to the protection of a covered bridge. After it was over there was 

 nothing to do but trudge home, as the water had risen and was car- 

 rying a heavy load of clay. The Pleuroceratida of the Big Moccasin 

 seemed to be the three species of the Little Moccasin exceedingly 

 eroded and one other species, Anculosa subglobosa. 



The weather instead of improving grew constantly worse. The 

 Doctor decided to go to points south for a try at the Holston river 



