Retrospective Criticism. 



471 



shaped pelvis, on which are placed, in successive series, five 

 costal plates, five scapulae, and an intervening plate. From 

 each scapula proceeds one arm, having two hands." (Miller,; 

 p, 85.) m& lami Jocfl y « LiiB ■; .?£ ,8S .q .VI JoV 



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Pelvis. 



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 J Arm, 3 joints. 



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Scapula. 



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ow for the comparison. The hly encnnite (Encnnites 



moniliformis) is to be furnished with a pelvis, two series of 

 costae and scapulae, and from each scapula is to proceed two 

 arms : the Cyathocrinites is to have a pelvis, one series of 

 costal plates and scapulae, and from each scapula one arm 

 alone is to proceed. Now, if the reader will have the good- 

 ness to refer to the accompanying illustrations, he will find 

 my specimen {Jig. 56. b) agree thus far, in the number of 

 bones, with the Encrinites moniliformis ; while, on the other 

 hand, it has one series of costal plates too many to range 

 with Cyathocrinites. It has also two arms, placed upon 

 each scapula, like the encrinite ; while the cyathocrinite has 

 but one. Miller further informs us that, in Cyaijhocrinites 

 planus, " the scapulae . . . have a horse-shoe-like: impression, 

 on which is inserted the first arm joint, to whicb the cunei- 

 form joint of the arm articulates."* (Miller, p. 87.) If the 

 reader will refer to Jig. 56. b and. Jig. 58., he will find that 

 in this portion of my specimen there is one supernumerary 

 bone, if we wish to make it a cyathocrinite. So much for 

 the number of bones. Now for their forms. But, perhaps, 

 the reader will allow me first to explain my method of re- 

 constructing my specimen, so as to form j%. 56. b of the 

 present illustrations. If he will have the goodness to refer 

 to the figure at p. 126., I will endeavour to explain the pro- 

 cess by which I proceed. The " gradually diminishing por- 

 tion," which, in my former communication [p. 125 — 128.], I 



* This does not appear to be the case with Cyathocrinites tuberculatus : 

 here the arm rests upon the entire surface of one scapula 



H H 4 



