PLATE 76. 



Fig. 1. 337. 1. Heterocrinus heterodactylus. (Pag. 279.) 



1 fi, b. Two specimens of the natural size. 



t c. The body of the same enlarged. 1 c'. Transverse section of the column, enlarged. 



t (/. An enlarged figure, representing the structure of this species. 



1 e,f. Fragments of slate with pentagonal columns of this specie?, 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, I, m, 71, 0. The same magnified, showing the pentapetalous expansion around the canal, and the deeply 



impressed strise, which are different in each one. 



Fig. 2. 338. 2. Heterocrinus simplex. (Pag. 280.) 



2 a. The specimen, natural size. 2 6. A few joints of the columns enlarged. 

 2 c. Section of the same, which is flattened from pressure. 



2 d. An enlarged figure, showing tlie structure of the body and arms of this species. 



Fig. 3. 339. 3. Heteeoceintjs? gracilis. (Pag. 280.) 



3 a. A specimen of the natural size. 



3 b. The same magnified. (The figure 3 J is erroneously marked 2 i on the plate.) 



