570 WORTHEN—PLATYCRINUS. 
edges of the radial plates have also a series of small teeth en- 
tering into depressions of the opposite che piece, but these 
are 80 ee as only to be seen with a 
Ther are three joints of the column attached to the speci- 
men figured, and these are exceedingly thin; the two nearest 
the summit are round, the third one elliptical, much smaller 
than the others, and bears radiating striz on its outer margin, 
which the others do not. The pe erforation in the centre is 
pentoge of first radial plates 27 ot tie width 22, Diameter at 
the upper edge of the basal cup 32 mill., height of the basal 
cup oe the centre of each side 15 mill., a of same to the 
top o its rojections at - angles 21 mill 
Teel | ; slat differ ne This Platycrinus differs from 
all known species in pee greater size, but more especially in 
the projections at ts angles of the — cup, and by its pe- 
culiar form of joint by which its bas ‘radial pieces are 
united. The teeth on the lateral ara rit its radial pieces 
will also serve to distin me it from any known species. 
Geol. Position and Locality—From the brown Crinoidal 
beds, ag — base of the Mountain Limestone series, Bur- 
lin, 
fuxe, take yiouadiet in dedicating this en species to its 
discoverer, my lamented friend Mr. H enry Petes who ric 
pointed out = distinctive characters which separate been 
‘Species for the P. planus, with which it has heretofore : 
Propvorss Ckoracawecs, n. sp. 
Prodictis depans, Norwood and Pratten, Tran in Phadepia A 
of Nat. Sciences, Augus 185K. PLT, Fig. 7, a, bc a 
This v characteristic form of the Chester Limestone was 
a uu Messrs. Norwood and Pratten in 1854, under the : 
: ER een wot hoc but as that ten Ba, already f 
eCO oid ‘eon- 
cies, mes necessary, in order to av 
i ge'e it another name. I propose or it the above 
are ee 
