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PLATE 1. 
1. 1. ScOLITHUS LINEARIS. 
(Pag. 2.) 
1 a. A vertical or longitudinal view ol' a specimen of the rock containing these bodies. 
1 b. A similar view of a specimen of partially altered and laminated sandstone from Pennsylvania, the tubes 
somewhat flattened. 
1 c. Weathered surface of a specimen of the altered sandstone (crystalline or granular quartz), from Adams, 
Massachusetts. 
Fig. 2. 
(Pag. 3.) 
2. 1. Lingula prima. 
(Pag. 3.) 
3. 2. Lingula antiqua. 
Fig. 3. 
3 a. The usual form of this fossil. 
3 b. A broader specimen, with apex wanting. 
3 c. A very broad somewhat rounded specimen, a view of the interior of the shell, the inner lamina? wanting, 
and the concentric elevated lines showing in relief. 
3 d. An elongated specimen, somewhat compressed laterally. 
3 e. An enlarged portion of 3 c. 
