264 The America?! Geologist. November, i899 
one, especially since it belongs neither to crinoids proper nor 
to cystids but rather to both. It is unlike other cystocrin- 
oidean species such as Cariocrinus in having no pores nor 
diplopores or pore rhombs on the calyx below the bases of the 
arms. It may be even contrasted with Porocrinus, which is 
crinoidean in the arrangement of the plates but has distributed 
pore-rhombs. The new species is without the same pore- 
rhombs but yet preserves cystidean asymmetry on one side 
of the calyx in the arrangement of the plates and also in the 
development of the arms. In most characters it is like Cara- 
bocrinus, a crinoid according to authors. 
STROPHOCRINUS DICYCLICUS, gen. et sp. nov. 
(Plate XII.) 
There are five infrabasal plates and these are apparently 
the homologue of six, i. e., there are four equal quadrangular 
plates, and the fifth is in size, shape and ornamentation like 
two anchylosed quadrangular ones, being pentagonal or rath- 
er, hexagonal with one angle a little re-entrant (see fig. i). 
The circle of five infrabasals forms a hexagonal field as in 
Carabocrinus et al. 
The basals are large, hexagonal or heptagonal but owing 
to the obtuseness of the inferior angle are approximately pen- 
tagonal and hexagonal respectively. There are six plates in 
the circle of basals, one of which is smaller than the others 
and corresponds to the posterior basal in position. It is 
hexagonal. The next ones to it are heptagonal and the other 
three hexagonal. 
The next circle comprises about ten plates, nine of which 
are evident on the type specimen (see figs, i and 2), but are 
in part broken away. In general the anterior side is sym- 
metrical and the posterior side asymmetrical as compared 
to the formula for Crinoidea. The anterior, symmetrical side 
preserves one radial upon which remain two brachials and 
a part of the third. None of the unbroken plates on the pos- 
terior side can be considered radials. The other plates require 
reconstruction, which in a partly crushed specimen ofifers some 
difficulty. But upon comparing the isolated" plates at hand 
with those of the type specimen, it is found that they match 
well each with some one, and that they are sufficient to afford 
