EcuinopErMATA. | LOWER PALALOZOIC RADIATA. 55 
apex of the heptagonal plate is a hexagonal interradial; above, and alternating with the primary radials, 
are five large pentagonal secondary radials (scapulee) completing the cup, on each of which rests a series 
of small pentagonal plates, supporting for the width of each plate a large number (? fifteen or sixteen), very 
slender long rays; column round, joints radiatingly striated ; alimentary canal pentapetalous. 
Messrs. Austin omit to notice the sixth or interradial plate in the second perisomic row, in their 
description. The genus differs from Cyathocrinus in the vast number of its rays. 
CroraLocrinus RuGOosuS (Jill. Sp.) 
Ref. and Syn.—Cyathocrinus rugosus (Mill.) Crin. 
Sp. Ch.—Length of body from pelvis to base of free rays eleven lines, greatest width (one-third below 
base of free rays) one inch two lines, length of fingers three inches five lines, width of hands rather less 
than a line, width of fingers about half a line, joints of rays a little longer than wide; length of pelvic 
plates three lines; width of columnar articulation six lines, length and width of primary radials seven and 
half lines ; plates marked with numerous radiating ridges about three in the space of a line, forming triangular 
patches; the centre of the plates sometimes obscurely tuberculated. 
Position and Locality —Not uncommon in the Wenlock limestone of Dudley, Staffordshire. 
Genus. ACTINOCRINUS (JMi7.) 
Gen. Char.—Column round, of alternately thinner and thicker joints, radiatingly striated from a round 
alimentary canal; pelvis hexagonal, of three pentagonal plates, supporting five hexagonal Ist primary radials 
(first costals), and one pentagonal interradial; on each Ist primary radial rests a hexagonal 2nd ditto 
(second costal), bearing the 3rd ditto (or scapule), from which proceed two rows of secondary radials or 
arms, of one or two flattened plates, laterally united to form part of the cup, giving origin as free rays 
to two hands of about four joints each, from which proceed several tentaculated fingers, composed of two 
rows of joints each; over the pentagonal Ist interradial, rest two hexagonal 2nd ditto (intercostals); 
alternating above each pair of primary radials, is one 2nd interradial; over the 2nd interradials rest three 
or more 8rd ditto (interscapular plates) blending gradually with the capital plates, which are often spinose ; 
mouth produced into a long tube; all the plates of the cup usually radiatingly ridged. 
ACTINOCRINUS PULCHER (Salt. W/SS.)* Pl. 1. D. fig. 3. 
Sp. Ch.—Length of cup from pelvis to 2nd secondary radial or arm-joint two lines, width at base 
of arms three lines, length of rays from 3rd primary radials (scapulz) to the tip of the fingers six and 
half lines; plates of the body conforming in number and shape to the generic type, but so strongly 
radiated, that they seem surrounded by a number of pits, corresponding to the number of their angles ; 
column near the pelvis one line in diameter, composed of circular, alternately thicker and thinner joints, 
every third or fifth larger than the others; at a foot from the pelvis the column is scarcely two lines 
in diameter, all the lower portion having the joints of nearly uniform thickness, each with an irregular 
circle of from eight to ten slender spine-like auxiliary side-arms three lines long; cuneiform secondary radials 
or arms supporting two rows of tertiary radials or hands about one and half lines long, each dividing 
into two fingers, the inner of which dichotomises again at about the same distance into two branches, 
* Mr Salter (now of the Geological Survey) undertook, some years ago, to engrave and write notices of Prof. 
Sedgwick’s Welsh and Westmoreland Fossils, but only a small portion of the task was ever achieved; such of the 
figures as were of use have been now transferred to stone (PI. 1. G.), and I have noted in the Explanations some 
little points requiring correction. I read over the notes, but made no farther use of them than to quote, with his name, 
&c., as above, such of his new species as seemed to me really new (giving, however, new descriptions), and I wished 
the MSS. to be printed entire to prevent misconceptions on this point; but, at the Author’s request, they have been 
returned to him for corrections, and will appear in an Appendix. 
