54 BRITISH PALAZOZOIC FOSSILS. [ EcurnoperMAtTa. 
Genus. ICHTHYOCRINUS (Conrad.) 
Ref—Conrad. Journ. Acad. Phill. Vol. VIII. (Partly defined by D’Orb. Prod. Pal.) 
Gen. Char.—Column round; cup composed of pelvis and all the primary radials; pelvis small, of five 
pentagonal joints, the re-entering angles supporting five pentagonal first primary radials (scapule), on 
which rest five equally wide quadrate 2nd ditto; 3rd ditto pentagonal or cuneiform, supporting two rows 
of secondary radials (or hands) of four joints each, from which proceed two fingers, each dichotomising, 
of one row of tertiary radial joints. 
The absence of interradial plates separates this genus from Taxocrinus. Without the suggestion of 
M. d’Orbigy (see supra) the figure and description of Mr Conrad would not have been definite enough 
to establish this genus, I therefore take them in conjunction as authorities for it. 
ICHTHYOCRINUS PYRIFORMIS (Phill. Sp.). 
Ref. and Syn—Cyathocrinus pyriformis, Id. Silurian System t. 17. f. 6. 
Sp. Ch.-—Column round, joints of unequal thickness till near the pelvis, where the column slightly 
widens, and the upper twelve or thirteen joints become very thin and equal; pelvic pieces rather more 
than half a line high; 1st, 2nd, and 38rd primary radials (or scapule and two arm joints), each about a 
line long; secondary radial rows (or hands) two lines long, the owter finger of each hand three lines long, 
with eight joints before bifurcation; the inner finger two lines long, with five joints before the furcation, which 
only occurs once in either finger; width of all the primary radial joints about one line and a third each; 
width of column about one line at an inch from the pelvis; length from pelvis to end of rays one inch. 
Position and Locality—In the Asterias bed of the Upper Ludlow rock at Light Beck, Underbarrow, 
Kendal, Westmoreland. 
Genus. MARSUPIOCRINUS (Phill.) 
Gen. Char.—Column round, of nearly equal joints; cup formed of the pelvis, one primary, one 
secondary, two or three tertiary radials, and five Ist interradials; pelvis pentagonal, supporting five large 
hexagonal (or slightly octagonal) Ist primary radials (or scapule), each of which bears two large flattened 
oblique, polygonal secondary radials, having between them at base, on the truncated apex of the primary 
radial, a small pentagonal interbrachial plate; over each secondary radial (or arm plate) is a double series 
of three or four wedge-shaped tertiary radial plates, representing two flattened hands, the last joint of 
each of which gives origin to a very long tentaculated finger, each of a double row of jomts; one large 
hexagonal interradial plate between each pair of primary radials. 
The tentacule, suggested by Prof. Phillips to be absent, are, I find, very largely developed, and the 
column is certainly round. 
Marsupiocrinus caLatus (Phiil.) 
Ref.—Phill. Sil. Syst. t. 18. fig. 3. 
Sp. Ch.—Width of cup one inch four lines; length from base of fingers (last tertiary radial) to pelvis 
eight lines; length of fingers three inches; length of primary radials or scapule three and half lines; 
width seven lines; length of interradial plate four lines; plates of the cup marked with small irregularly 
radiating vermiform wrinkles. 
Position and Locality—Wenlock limestone, Dudley, Staffordshire. 
Genus. CROTALOCRINUS (Ausz?.) 
Ref—Austin, Ann. Nat. Hist. 1843, p. 198. 
Gen. Char.—Pelvis pentagonal, of five pentagonal plates, supporting one heptagonal and four large 
hexagonal primary radials (first costals), which alternate with the pelvic plates; resting on the truncated 
