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