123 POSSIL FAUNA. 



PLATE LI.—. 



Fig. 12. The receptacle of a Crinoidean (Plati/crinus leevis, of Miller); from the mountain lime- 

 stone, Ireland. Fig. 13, ossicles of the arms; and fig. 14, joints of the stems, slightly 

 magnified. 



Fig. 15. " The superior part of the Briaraean pentacrinite." Mr. Parkinson. — (Pentacrinus Briareus, 

 of Miller.) The specimen is a slab of Lias, almost wholly made up of crinoideal 

 remains. In relief on the surface are the stems and dislocated ossicles of the recep- 

 tacle ; the latter are thus enumerated by Mr. Parkinson ; — a, scapula ; h, clavicle ; 

 c, first bone of the arm ; d, second arm-bone ; e, commencement of the two series of 

 bones forming the fingers. 



Fig. 16, is another slab of pentacrinal Lias limestone, with portions of a stem and numerous side- 

 arms : these are generally electrotyped, as it were, with a brilliant pyrites, giving 

 a rich metallic lustre to the animal remains. In the British Museum there are many 

 splendid specimens of this highly interesting family of Kadiaria. I would especially 

 direct the intelligent visitor's attention to a slab of stone, many feet in height and 

 breadth, on which a group of Pentacrinites is displayed, as palpable and perfect as if 

 the animals were sporting in their native element. This matchless specimen is from 

 Germany. 



Fig. 17. One of the small auxiliary lateral tentacles of a Pentacrinite. 



