PLATE 76. 
Fig. 1. 337. 1. HETEROCRINUS HETERODACTYLUS. (Pag. 279.) 
1 a, b. Two specimens of the natural size. 
1 e¢. The body of the same enlarged. 1c’. Transverse section of the column, enlarged. 
1d. 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 f’ is 
omitted on the plate.) 
1 g. A fragment of one of these columns enlarged, showing the nodulose angles. 
1h. A fragment of a column, with a section of the same. 
17. A fragment of slate, showing numerous impressions of the plates or discs of the column. 
1k, l,m, n, 0. The same magnified, showing the pentapetalous expansion around the canal, and the deeply 
impressed strize, which are different in each one. 
Fig. 2. 338. 2. HETEROCRINUS SIMPLEX. (Pag. 280.) 
2a. The specimen, natural size. 2b. A few joints of the columns enlarged. 
2 ec. Section of the same, which is flattened from pressure. 
2d. An enlarged figure, showing the structure of the body and arms of this species. E 
Fig. 3. 339. 3. HETEROCRINUS? GRACILIS. (Pag. 280.) 
3 a. A specimen of the natural size. 
3b. The same magnified. (The figure 3 b is erroneously marked 2 6 on the plate.) 
= 
