EXPLANATION OF PLATE 46". 75 



argillaceous Schist, sufficiently hard to be used for 

 building. Nat. size. (V. I. p. 307, Note.) 



Even the skin, hairs, and pores of the tracheae of 

 this animal are preserved. 



In the same stone are many carbonized fragments 

 of Vegetables, and on the right of the body is a 

 large fossil Nut (a) ; this side of the animal has 

 been laid open by cutting away the stone. (Stern- 

 berg.) 



2. Lower surface of the same animal, discovered in split- 



ting the stone in search of fossil Plants ; nat. size. 

 Near the point of the right claw, is a fragment of 

 the tail of another and larger Scorpion. (See PI. 46", 

 Fig. 13.) We have here also the side of the same nut 

 that is seen in Fig. 1. a. This trifid nut exhibits 

 traces of the structure of the outer coating in which 

 it was inclosed. (Sternberg.) 



3. Magnified representation of the Head and Eyes. See 



V. I. p. 307. (Sternberg.) 



4. Magnified jaw, armed with teeth, and partially covered 



with minute hairs. (Sternberg.) 



5. Hairs on Fig. 4, highly magnifed. (Sternberg.) 



6. Magnified representation of a portion of the skin, con- 



sisting of two divisible layers. See V. I. p. 308. 

 (Sternberg.) 



7. Magnified impressions of muscular fibres connected 



with the legs. (Sternberg.) 



plate 46". V. I, p. 308. 



Fossil Insects, Arachnidans, and Limulus. 



The following description of the Insects represented in 

 this Plate is founded on information received from Mr. 

 Curtis and Mr. Samouelle. 



