118 
Case and 
Column of 
Drawers. 
SILURIAN. 

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

FC 
FC 
FC 
FC 







Names and References; Observations, &c. 

Numbers and Localities. 

a. Irregular Crinoids. 
Herpetocrinus, n.g. (Myelodactylus, Hall. The 
name, based on false ideas, cannot be kept. 
The column is described as fingers and 
wrongly named, for the pierced column 
and finger-joints are common characters). 
I am constrained to form a new genus for 
about three species of crinoids which de- 
part from all ordinary rules. A minute cup, 
all but obsolete, and with dichotomous nar- 
row arms, branched like those of Homo- 
erinus, Hall. This is set on a narrow cylin- 
drical suberect stem, which soon however 
becomes compressed, then hollowed on one 
side, and bears close set auxiliary arms to 
the lowest part, so far as observed. The 
stems coiled up like an adder, resemble arms 
of crinoids rather than stems. 
Herpetocrinus Fletcheri, n. sp. Stems two or 
three lmes wide at most; with narrow, 
smooth, unridged rings, not tuberculate, 
arms repeatedly dichotomous, linear. 
Other species exist in the Gray collection. 
Cheirocrinus, n.g. (Austin named it Pendulo- 
crinus, a bad name, for it is compounded 
of Latin and Greek). Chetrocrinus is now 
accepted generally. It was proposed in 
Siluria, 2nd ed. (commonly called 3rd ed.) 
1859, by me. 
Cheirocrinus serialis, Austin, sp. (Siluria, 2nd 
ed, Appendix, p. 535). The upper arm is 
greatly larger than the others, and the 
lower ones crowded under it. 
Cheirocrinus abdominalis, n. sp. Shape like 
the last, but arms much more equal in 
size. 
Cheirocrinus gradatus, n. sp. Arms nearly 
equal in size; simple, form not very much 
oblique. 
a. 384, Dudley, F.C. 
a, 385, Dudley, F.C.; also 
cast of Gray’s specimen 
(Brit. Mus.). 
a. 386, Dudley, F. C. 
a. 887, Dudley, F.C. 
