PLATE A 17. 
Fig. 1. 
416. 15. Graptolithus clintonensis. 
( Pag. 39.) 
1 a. A lamina of slate, with fragments of this species upon the surface. Where imbedded in the soft green 
shale, the depth of the serratures and the pointed extremities are not so clearly preserved. 
1 b. A fragment of a stipe, showing the depth of the serratures and the curved extremities. 
1 c. A similar fragment, showing the opposite side. 
1 d. A small fragment which is less flattened, the axis more solid, and the teeth appearing shorter. 
1 e & 1 /. Enlargements from the previous figure. 
1 g. A small fragment of the same species, showing some small nodes at the base of the teeth. 
1 h. A portion of 1 g enlarged. 
417. 16. Graptolithus venosus. 
Fig. 2. 
(Pag. 40.) 
2 a. A'piece of slate, with numerous fragments of G. clintonensis and G. venosus. The latter are much more 
indistinct than the former, and can scarcely be brought out without a magnifier. 
2 b. A fragment of G. venosus enlavged. 
2 c. A fragment (enlarged), which appears to be the upper extremity of the stipe of this species. 
2 d. A fragment of this species still farther enlarged. 
