84 EXPLANATION OF PLATES 51. 52. 



abdominal cavity. See V. I. p. 322. Note. (Copied 

 from Miller's Crinoidea, P. 41. PI. III.) 



Plate 51. V. I. p. 32G, and 330. 



Fig. 1. Pentacrinites Briareus, (nat. size) on a slab of 

 Lias from Lyme Regis, covered with a large group 

 of the same animals, in the collection of the Geolo- 

 gical Society of London. (Original.) 



Fig. 2. Rare and beautiful specimen of Briarean Penta- 

 crinite, from the Lias at Lyme Regis, in the collec- 

 tion of Mr. Johnson, of Bristol, showing the plated 

 integument of the abdominal cavity, terminated up- 

 wards by a flexible Proboscis, and surrounded by 

 the commencement of the arms- and fingers. This 

 part of the animal is very seldom preserved. See 

 V. I. p. 330. (Original.) 



Plate 52. V. I. p. 325. 



Fig. 1. Recent Pentacrinus Caput Medusas, from the 

 bottom of the sea, near the I. Nevis, in the W. In- 

 dies, reduced from the Figure in Miller's Crinoidea, 

 P. 48, PI. I. In the front of this Figure, two of 

 the arms with their hands and fingers are much 

 smaller than the others, and show that these ani- 

 mals, when mutilated, have the power of reproducing 

 lost parts. 



D. Auxiliary side arms, articulating at distant intervals, 

 with the vertebral column; these also, when muti- 

 lated, are reproduced. 



Y First costal plate. 



Y Second costal plate. 

 H. Scapula. 



I. Interscapulary joint. 



