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concave. In the concavities of these are placed another series of 

 five other bodies of a similar form, whose inferior surfaces possess a 

 degree of convexity, which adapts them for reception in the concavi- 

 ties of the former bodies, and whose superior surfaces, like those of 

 the former series, are regularly concave, Plate XVI. Fig . 8. c. 



In these concavities are placed five other bodies, being the last se- 

 ries of those which appear to form the arms. Their inferior surfaces 

 are convex, fitted to the cavities which receive them ; and their su- 

 perior surfaces are each divided by a ridge, into two pits or concavi- 

 ties, Plate XVI. Fig. 8, d. which are more distinctly seen in the spe- 

 cimen, Plate XVI. Fig. 6. These appear to have been the articulat- 

 ing surfaces of other bodies which have not been preserved, but 

 which may be presumed to have been the articulated fingers of the 

 animal, analagous to those which are seen to exist in the lily 

 species. 



From the regular diminution of size in the three last series of bo* 

 dies, the part of the skeleton which they compose becomes contracted, 

 and the whole mass assumes somewhat of a pear-like shape ; a cir- 

 cumstance which may be employed for distinguishing this species, 

 as I have presumed to do, by the designation of the PEAR ENCRI- 

 NITE. 



Although this species differs so much, in form, from the lily encri- 

 nite, yet the analogy existing between their component parts is very 

 close. As in that, so in this species, those parts exist, which, from 

 their serving to unite the upper extremities to the body of the animal, 

 have been considered as the clavicles and scapulae: and in both 

 species the five arms of the animal divide and form hands, each con- 

 sisting of two articulated fingers. 



Having taken this view of the structure of the superior termina- 

 tion of this animal, as far as its imperfect remains will allow; and 

 having also found its structure to accord in its general characters with 



