PLATE III. 



Fig-. 1. Platycrinites trigintiuactylus, a to h. 



1. a. — lateral aspect of a small specinieii she-wing the column, with side arm ■? body, 



tentaculated rays, and proboscis in the centre. 

 1. b. — large specimen exhibiting the fidl grown body, the tentaculated rays, and the 



upper portion of the column. This is nearly the largest size to which the 



species attained. 



1. c. — specimen with the tentacidated rays attached, and the elongated oral tube, on 



wliich the hexagonal plates which envelope it are beautifully exhibited. 



d. — perisomic ray-bearuag plate, shemng the deeply formed excavation for the attach- 

 ment of the rays. 



e. — dorso-ccntral plate. 



g. — perisomic ray-bearing plate, with the divisions of the rays and then- articulations. 



h. — portion of a column. Though it is difficidt or impossible to determine with 

 certainty as to which species this column appertained, yet as it probably 

 belonged to the present one, we have included it in our illustrations. 



Fig. 2. Platycrinites granulatus, / to o. 



2. i. — a beautifully preserved specimen, exhibiting the rays, ten taenia, &c. 

 A-. — lateral aspect of the specimen which ^Miller described ti-om. 



/. — specimen shewing the base of the oral apparatus. 



»«. — dorso-central plate. 



n. — perisomic ray-bearing plate, exhibiting the excavation for the rays. 



0. — shevsdng the manner in which the rays bifmcate. 



Fig. f3. Platycrinites striatus, p to u. 



;3. p. — lateral aspect, exhibiting the rays, tentacida, &c. 



r. — portion of the column, shewing the structural modifications. 



s. — dorso-central plate, exhibiting the manner m which the striae run. 



t. — ^lateral aspect of the dorso-central plate. 



M. — perisomic ray-bearing plate, with the small excavation for the ray joint. 



The whole of the figures given in tliis plate are taken from specimens in the Author's 

 Collections, with the exception of h, A\ I, which are di'awn from specimens in the Bristol 

 Institution Museum. 



