PLATE VU. 



Fig. 1. IIexacrinus pextangli.aris. «, l>. ( 

 a. — dorso-ceiitial aspect. 



b. — lateral aspect exhibiting the lower portion of a primary ray. 

 c. — view of the cavity which contained the digestive organs. 

 J. — lower portion of a primary ray, and the intermediate plates. 



Fig. 2. Various unappropriated columns, a, b, c, d, v, f,g, h. 

 a. — articulating surface of columnar joint. 

 b. — lateral view of the same column. 

 c. — portion of moniliform colunui. 

 d. — articulating facet. 



e. — columnar articulation with pentapetalous canal. 

 J'. — portion of the same column. 

 ff. — facet of columnar joint. 

 h. — fragment of column. 



Cariocrinus. 

 Fig. 3. Cariocrinus ornatus. a, to ;«. 

 a. — lateral aspect of a full-sized specimen. 

 b. — dorso-central aspect. 

 c. — lateral view of a smaller specimen. 

 d. — abdominal plates, shewing the oral and anal apertures. 

 e. — portion of a crinoid's ray, probably that of the Cariocrinus. 

 f. — enlarged view of the same specunen. 

 g. — articulating surface, shewing the divisions of the jouits. 

 /(. — -column of Cariocrinus ornatus P 

 i. — articulating facet. 



k. — -inner surface of one of the hexagonal perisomic plates. 

 I. — external surface of ditto. — Both magnified. 

 m. — one of the second series of plates, with the small ray-bearing j)lates resting on it. 



Cyathocrinus. 

 Fig. 4. Cyathocrinus planus, a, to c. 

 a. — lateral aspect shev^ng the meso plate, the arrangement of the rays. &:c. 

 6. — lateral aspect of a different specimen. — In the Author's cabinet. 

 c. — lateral view of a larger specimen. — In the Bristol Institution. 

 d. — dorso-central aspect of the same. 

 e. — view of a specimen which shews the protrusive mouth, &c. 



