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Delaware River, near Philadelphia, Pennsylvania, USA
latitude: 40.0798
longitude: -74.884804
Precision of location: Gauged from chart or map
Site Named Here: By name of island, bay, strait, lake, river, or stream, etc., named in source publication
| Hydrolimax grisea | 1851 or earlier | check exact location in reference. | ||
| Hydrolimax grisea | 1938 or earlier | collected by Dr. Charles Hadley near Montclair. exact location unknown. |