



> 





PLATE 1. 



Fig. 1. 1. 1. ScOLITHUS LINEARIS. ( P^g. 2.) 



1 a. A vertical or longitudinal view of 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 e. Weathered surface of a specimen of the altered sandstone (crystalline or granular quartz), from Adams, 



Massachusetts. 



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4 



Fig. 2. 2. 1. LiNGOLA PRIMA. (P<%* 3-) 



Fig. 3. 3, 2. LlNGULA ANTIQUA. (Ptlg- 3') 



3 a. The usual form of this fossil. 



1^ ^t 



3 6. A broader specimen, with apex wanting. ^ ^* ^ 



_ . 3 c. A very broad somewhat rounded specimen, a view of the interior of the shell, the inner laminse wanting, ^» ^ ^i- 



W0 and the concentric elevated lines showing in relief. •^ ~ ^ 



3 d. An elongated specimen, somewhat compressed laterally. ^ ifjf 



3 <-. An enlarged portion of 3 e. 





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