WENLOCK GROUP. 123 



Case and 
Column of 
Drawers. 
Reference to McCoy’s 
Names and References; Observations, &c, Numbers and Localities. 
Synopsis: and Figures of Genera. 


Crotalocrinus, Aust. A most remarkable genus. 
In all other crinoids yet known the arms are 
free and the fingers free; in this they are 
all united by transverse processes into a 
flexible basket, just like wicker-work. To 
make the apparent anomaly greater, the 
arms appear, and appear only to start in 
M great numbers from the edge of the globu- 
C. rugosus, p. 55. lar calyx; whereas they really start from 
a point far inward on the stomach plates— 
the upper edge of the calyx being strongly 
and sharply inflected. Only one species is 
known in Britain, In Sweden another has 
been described by Miiller, which really has 
the five fans of fingers distinct at the base, 
and overlapping each other. The attinity 
is with our next genus, Cyathocrinus, to 
many species of which there is a remote 
resemblance in the numerous fingers, and 
the structure of the cup is the same, viz. 
one set of subradial plates, 




FC Crotalocrinus rugosus, Miller, (Siluria, 2nd | a. 424, a. 425, a. 426, var., 
Ge ed. Woodcut 55, fig. 4—7, p. 247, pl. 13, | a. 427, a. 428, shew sto- 
fig. 3), mach-surface; a. 430, base 
of all the arms; a. 429, a. 
432, a. 433, roots, Dudley, 
F.C.; a. 431*, Gray’s cast; 
a. 671, the most perfect 
stomach - plates, balloon- 
shaped stomach (Ketley 
Coll.). 
Cyathocrinus, Miller. Cup of five basal pieces, 
with five intermediate (subradial) pieces, 
between which the arms originate. 
FO Cyathocrinus quinquangularis, Phill. (not | a. 435, Dudley, F. C. 
Mill.), Rhodocrinus, Sil. Syst. t. 18, fig. 5, 
FC Cyathocrinus (sp. 1). Like C. goniodactylus, | a, 499, Dudley, F. C. 
with similar cup, and general structure, but 
greatly thicker arms, 
FC Cyathocrinus (sp. 2) decadactylus, Salter. Ten | a. 494, Dudley, F. C. 
single arms, unbranched, and with very 
large thick tentacles, 

16—2 
