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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 concavities 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 articula- 
ting 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-hke 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 consisting 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 
