122 
basal, and tlie other a radial plate, of closely allied species. The basal 
may belong to P. tenuin, and the radial to P. radiatus, or they may both 
belong to the same species. These fragments, which I am unable to deter- 
mine more accurately, were found in the same limestone as the preceding 
species. 
ACTINOCRINUS, Miller. 
Actinocuinus polydactylus, Miller.^ 
PI. VI, Fig. 3. 
Enc) 'illUS, Cumberland, 1819, Trans. Greol. Soc. London, V, p. 90, pi. 2, fig. 8. 
A.ciinOCrinus polydactylus, Miller, 1821, Nat. Hist. Crin., p. 103, pi. 1, fig. 1 and 2 (fig. 
ccst. exclusis). 
,, ,, Agassiz, 1835, Mem. Soc. Neucbatcl, I, p. 197. 
,, ,, J. Phillips, 1836, G-eol. Yorkshire, II, p. 206, pi. 4, fig. 17 and 1 8. 
„ „ L. G. de Koninck, 1812, Descr. Anim. Foss. Terr. Carb. Belg., 
p. 51 , pi. G, fig. 3. 
„ ,, L. G. de Koninck and H. Le Hon, Eech. Crinoides Terr. Carb. 
Belg., p. 134, pi. 4, fig. 2. 
Although I have had at my disposal only the internal cast of a nearly 
complete calyx, I have not hesitated, in spite of the absence of all trace of 
ornamentation, to identify this as A. polydactylus, Miller. The shape, the 
number, and arrangement of all the pieces, are so like tlie corresponding 
pieees in more perfect specimens, with which I have compared them, that I 
have no doubt of their identity. Tor the detailed description see the works 
quoted above. 
Horizon and Localities . — This species is not uncommon in the Car- 
boniferous Limestone near Hook Point, Ireland. It is, however, very rare in 
the Tournay Limestone. In Australia it is found in a greyish sandstone at 
Glen William. 
PLATYCRINUS, Miller.^ 
This genus is represented, among the specimens collected by the Ptev. 
W. B. Clarke, only by the impression of a few joints of the column, 
and by the complete base of a small individual (PI. VI, fig. 6). These pieces 
belong, if not to P. Icevis, Miller, at least to a closely allied species, but they 
' [Vide R. Etheridge, Junr., Mem. Geol. Survey N.S. Wales, Pal. V, pt. 2, 1892, p. 77, pL 20, figs. C, 7. — 
W.S.D.] 
2 [OiJ. cit., p. 80.— W.S.D.] 
