WENLOCK GROUP. 

Case and 
Column of 
Drawers. 
‘eal 
FC 

FC 
FC 
FC 

Reference to McCoy’s 
Synopsis: and Figures of Genera. 



Names and References; Observations, &c. 
121 
Numbers and Localities. 

Dimerocrinus decadactylus, Phill. (Siluria, 2nd 
ed. pl. 13, fig. 5). Cup with convex highly 
ornamented plates. Ten arms which diverge. 
A common species. This grows large. A 
very fine specimen shews the arms and 
plates of the cup tuberculate. 
Periechocrinus, Austin. The largest and most 
common of Dudley crinoids, with a long 
conical cup—plated all the way up to the 
end of the bifurcation of the arms, which 
then, fifteen to thirty-four in number, are 
long, straight and unbranched; but of 
course not simple, being composed of a 
double row of bones, Proboscis massive, 
central. Stomach plates small. Stems mo- 
niliform, of thick joints. Range—May Hill 
Sandstone to Ludlow rock. 
Periechocrinus moniliformis, Miller, spec. (Si- 
luria, 2nd ed. pl. 13, figs. 1, 2). There are 
thirty-two or thirty-four arms. Pelvis coni- 
eal, ridged by the radial plates. The arms 
branch and dichotomise, 
Periechocrinus simplex, n.s. Arms fifteen 
only. Cup smaller and_ broader, radials 
strongly ridged, plates radiated. A very 
distinct good species. 
| Periechocrinus limonium, n.s. Arms twenty- 
seven or twenty-eight, as in moniliformis, 
but cup ovate. Scarcely ridged by the 
radial lines. Plates thin, looks like Hypan- 
thocrinus granulosus, 


a. 406, Dudley, F, C. 
a. 407, Dudley, F.C. 
a. 408, stem, a. 409, cup 
dissected, a. 410, arms all 
displayed, Dudley, F.C.; 
a, 411, proboscis (Ketley 
Coll.); a. 412, proboscis 
(Ketley Coll.); a 417, 
Dudley, F.C; a. 418, 
shews large pair of arms 
five- branched _(Ketley 
Coll.). 
a. 413, Dudley, F.C. 
a. 414, Dudley, F,C.; 
a. 415, shews the stomach- 
plates; a. 416, young, Dud- 
ley, F. C, 
16 
