PLATE 73. 
Fig. 1. 323. 4. GRAPTOLITHUS MUCRONATUS. (Pag. 268.) 
1 a. Two fragments of this species. 1b. A portion of one enlarged. 
1 c,d. Fragments of the same species, one of them much contracted, and both preserving extremely mucro- 
nate teeth. 
Fig. 2. 324. 5. GRaPTOLITHUS BICORNIS. (Pag. 268.) 
2a. A small specimen of the natural size, showing the bifurcation below. 
20. A portion of the same magnified, showing the form of the teeth. 
2c. A larger specimen having the same character, with a stronger bifurcation, which is thickened at the point 
of separation. 2d. A portion magnified. 
2 e. A specimen having similar obtuse teeth, with the base removed and the midrib projecting above. 
2f. A fragment of slate, with several specimens preserving the peculiar radical termination; associated with 
G. ramosus. 
2 g, h. Magnified portions of these, showing a dissimilar form in the teeth. 
27. A fragment in the slate, preserving its original form in a good degree. 2k. The same enlarged. 
27. A fragment in limestone. 27’. A more compressed form in the same. 
2m, m’. Enlarged portions of the same. 
2m’, A magnified view of the edge of a specimen in limestone, showing an appearance analogous to G. sea- 
laris. 2m. Transverse sections of the same magnified. 
20. A slender specimen, with the sides parallel. 
2p. A similar specimen, preserving the capillary axis beyond the remaining portion of the stipe. 
27,8. Magnified portions of these, showing their identity with the preceding. 
Fig. 3. 325. 6. GRAPTOLITHUS RAMOSUS. (Pag. 270.) 
3 a, a’. Small specimens near the radical termination, having a simple bifurcation above. 
3b, A specimen with a more diverging and elongated bifurcation, with a smaller specimen lying obliquely 
across the right ramus. 
3b’ & b’,. The same species. 3c, d. Enlarged portions of the two last. 
3 e. A specimen with elongated rami, which are serrated on one side only. Fragments of G. sagittarius on 
the same specimen. 
3 f. A specimen branched below, and bifurcating above. The branches and bifurcate stipe above are serrated 
on one side only ; while the stipe below and between the branches and bifurcation is serrated on both 
sides. 
3g, h. Enlarged portions, showing the character of the teeth at the points of divergence, below and upon the 
branches. 
Fig. 4. 326. 7. GRAPTOLITHUS SCALARIS. (Pag. 271.) 
4 a. A specimen showing the radical termination. 4b. A portion of the same magnified. 
4c. A more slender and tapering specimen, with a single range of dissepiments. 4d. Magnified portion. 
4e, f. A small fragment, with oblique dissepiments and smooth margin. 
4 g, A specimen with apparently a single range of dissepiments, and a central capillary axis projecting beyond 
the stipe. 
