300 F. B. Meek on new Silurian Crinoids and Shells. 
arated, presenting no sutures or openings, but in some conditions, 
showing numerous, distinct regularly arranged, radiating striz, 
corresponding to radiating lamelle that oceupy the whole internal 
cavity from top to bottom. 
_ Among the more remarkable features of this fossil, may be men- 
tioned its very curious system of radiating lamelle occupying the 
In diameter, and sey ches inlength? Is it homologous wi 
the so-called proboscis or ventral tube of other crinoids, or with 
the colu of. Hall evidently entertained the 
mens than those from which his diagnosis was written, he inclined 
to the opinion that it is a column. at one or the other of these 
views 18 correct, would almost necessarily seem to be the case, 
ling free, and if viewed as a column, apparently useless ? Again, 
if a column, connected with the free side of the body of an at- 
tached crinoid, how are we to account for the fact that no traces 
; ing 
oreign bodies, and this long appendage in all cases be left dang- 
rs In size inward, and pass b e lations into those 
forming the base of this long nate” e 
