EXPLANATION OF THE PLATES, 105 
Fie. 5.—Woopocrinus macropactyius, De Koninck. 
Brit. Assoc. (1857), Trans. of the Sections, p. 76. De Koninck and E. Wood, 
Geologist (1858), p. 12, pl. i. 
Original. Reduced to half natural size; side view of head, arms, and por- 
tion of column; Carb. Limest., Yoredale beds, Swaledale, near Rich- 
mond, Yorkshire. 
Fic. 6.—a, 6, c. Porrrtocrtnus crassus, Miller. 
Crinoidea, p. 69, pl. xxii. Aust. Crin., p. 69, pl, viil., fig. 3, &e. 
Original. a. Portion of column. 6. Surface of a joint covered with radiat- 
ing striz, the central canal being circular; from lower part of column. 
ec. Surface from upper part of column, in which the central canal is 
pentagonal, and the radiating striz not continued to it. Carb. Limest., 
Cavan, 
CARBONIFEROUS LimEesTONE.—Yorkshire, Bristol, Ireland. The columns 
of this species, sometimes three-fourths of an inch in diameter, are very 
frequent in the Lower Carb. Limest. of Ireland. 
Fie. 7.—Porertocrrnus conicus, Phillips. 
Geol. Yorks, vol. ii., p. 205, pl. iv., fig. 3. Portl. Geol. Rep. p. 350, pl. xvi., 
fig. 12. 
Original. Lower portion of Cup or Head. Carb. Limest. Derryvullan, 
Co. Tyrone. 
Carpontirerkous Limestonr.—Yorkshire, Bristol, Ireland. 
Fre. 8.—ActTINocRINUS, sp. 
Cyathocrinus planus, Miller, Crin., p. 86, pl. xxx., fig. 27. Potervoerinus, 
Austin, Crin., p. 61. 
Original. Portion of column, with ramules, or side arms. Carb. Limest. 
(lower) shales. Hook Head, Co. Wexford. This figure is introduced 
merely to show the articulations of the ramules. 
Fic. 9.—Acrinocrinus potypactytus, Jfiller. 
Crinoidea, p. 103, pl. xli., xli. Geol. Yorks., vol. i, p. 206, pl. iv., figs. 
Alte? 
Original. Some of the lower radiated plates of the ewp, or. body of this 
Crinoid, attached to a portion of the stem. Carb. Limest. lower, Hook 
Head, Co. Wexford. 
CarRBoNIFEROUs LimESTONE.— Yorkshire, Mendips, Ireland. 
It is probable that A. triacontadactylus, Miller, and some others will be found 
to be synonyms of this species. 
Fre. 10.—Acrinocetnus amenora, Goldfuss, sp. 
Melocrinites, Goldf. Nova Acta Acad. Nature Curiosorum, vol. xix., 
p. 341, pl. xxxi., fig.“4. Actinoerinus, Portl. Geol. Rep., p. 347, pl. xv., 
figs. 4, 5, 6. 
