PLATE 76. 
Fig. 1. 337. 1. Heterocrinus heterodactylus. (Pag- 279.) 
1 a, b. Two specimens of the natural size. 
I c. The body of the same enlarged. 1 c'. Transverse section of the column, enlarged. 
1 d. An enlarged figure, representing the structure of this species. 
1 e,f. Fragments of slate with pentagonal columns of this species, showing the body at (The letter /' is 
omitted on the plate.) 
1 g. A fragment of one of these columns enlarged, showing the nodulose angles. 
1 h. A fragment of a column, with a section of the same. 
1 i. A fragment of slate, showing numerous impressions of the plates or discs of the column. 
1 k, l, m, n, o. The same magnified, showing the pentapetalous expansion around the canal, and the deeply 
impressed striae, which are different in each one. 
Fig. 2. 338. 2. Heterocrinus simplex. (Pag. 280.) 
2 a. The specimen, natural size. 2 b. A few joints of the columns enlarged. 
2 c. Section of the same, which is flattened from pressure. 
2 d. An enlarged figure, showing the structure of the body and arms of this species. 
Fig. 3. 339. 3. Heterocrinus? gracilis. (P a g- 280.) 
3 a. A specimen of the natural size. 
3 b. The same magnified. (The figure 3 6 is erroneously marked 2 b on the plate.) 
