licluiiodcnuata and a X cw liracluoj^od. — Rowley. 277 
the absence nt' iiil'ral)asals ) and nne liexai^onal. The radials 
are larger than the hasals and licpia^oiial. I'irst costals hex- 
ag'onal. Second costals pentat;onal. 
The first interhrachial is hexagonal and followed above by 
two smaller plates. Xo higher plates are found <in ihe im])er- 
fect type specimen. A large hexagonal first anal is succeeded 
by three plates atovc, the middle of llie anal area Ticing trav- 
ersed by a strong fold or ridge. The granular surface char- 
acter, the absence of central m des and the verv strong rad- 
iate ornamentation and ray folds may be sutilicient to separate 
this crinoid specifically from the former species. If so, the 
])roposed varietal designation may become the name of the 
species. 
\\'ere it not for the fewness and size of the interhrachial 
plates, both this and the previously described species might b.? 
referred to Ptychocrinus ^^'. & Sp. (Gaurocrinus. S. A, M.). 
Horizdii and locality same as the last. 
Gissocrinus? problematicus, n. sp. 
Plate XVI. Fir.s. 37, 38, 39. 40, 41. 
L'nder basals three, of nearly equal size and forming a 
slight romided rim below the basals. Two of them are five 
and the third four-sided. 
The anterior one is longer than either of the other two. 
The basal ])lates are large and a little longer than wide, 
the posterior being heptagonal and truncate above to receive 
the first anal plate. The basal to the right of the posterior is 
also heptagonal while the one to the left is ]XMitagonal. The 
right anterior basal is hexagonal and the left pentagonal. 
Two of the radial plates are much larger than t!ie basals 
while three are of about the same size and one smaller. The 
large radials are the anterior and the one to the left of it. The 
one to the right of the anterior has its upper ed^e below that 
of the other radials. The posterior radials rest between the 
sloping upper edges of basals a little more deeply than 
the others and are smaller, the one on the left of the anal 
area sujjporting aljove a costal of greater width, partly rest- 
ing on the first anal. The small radial to the right of the anaf 
area supports above a costal of greater length and widtli ]iarr- 
ly supported by a basal. 
