UPPER, OR FLINTY CHALK. 187 



adhesion of plate to plate by simple sutures, plainly indicate that the 

 whole were invested by a muscular integument; the markings on the 

 plates being the eiFects of its action*. 



From the rudiments of the arms, it is also equally obvious, that the 

 recent animal was furnished with tentaculae, to enable it to seiz^e and 

 detain its prey, in the same manner as the encrinites, &c. Its position 

 when floating in the water, was in all probabihty with the mouth down- 

 wards, like the Medusa pulmo, M. campanulata, and other species of that 

 family. 



The specific name is in commemoration of the valuable researches of 

 my friend J. S. Miller, Esq. A.L.S. of Bristol; a tribute of respect, to 

 which his able investigation of the Natural History of the Crinoidea, justly 

 entitles him. 



Tab. xvi. fig. 6. represents the only specimen in which the reniform, 

 or pectoral ossiculae remain; but the plates have suffered so much dis- 

 placement from compression, that their relative situation is not very ob- 

 vious, without careful examination. It does not however appear pro- 

 bable, that the proboscideal form in which the pectoral bones are dis- 

 posed, is the effect of accident, since a similar structure prevails in the 

 actinocrinites-f, and several other zoophytes. A clavicle united with one 

 of the humeral bones, is seen attached to the scapula, near the middle of 

 the figure. 



fig. 7. The semilunar depression on the upper margin of a 



scapula. 



fig. 8. Outline of the clavicle. 



fig. 9. A clavicle and humerus united. 



figs. 13, 14. Detached costal plates ; the one finely striated, the 



other with obtuse ridges. 



fig. 15. The entire pelvis, consisting of the abdominal, costal, 



intercostal, and scapular plates. Specimens of this kind, more or less dis- 

 torted, are the only parts of the animal generally found; the clavicles, 



* Miller's Natural History of the Crinoidea, p. 137. 



f Vide Nat. Hist. Crinoid. Actinocrinites, 30 dactylus, PI. 2. 



B B 2 



