EcuinoDERMATA.] UPPER PALAZOZOIC RADIATA. 119 
plates large, polygonal more or less prominent in the centre ; mouth small, excentric ; plates of the cup generally 
marked with radiating rows of small tubercles, and two or three rows parallel with the margin ; interradial (or 
inter-scapular) plate large, hexagonal. 
This much resembles the P. rugosus, but the form is more cylindric, the plates thinner, with smaller and 
more regular tubercles, the interradial plate larger, and the excavation in the scapulz or Ist primary radials 
for the arms or 2nd primary radials much narrower. 
Position and Locality——Abundant in the carboniferous limestone near Bakewell, Derbyshire. 
PLATYCRINUS MEGASTYLUS (J/°Coy). 
Ref.—M‘Coy, Ann. Nat. Hist. 2nd Series, Vol. IT. p. 247. = P. levis Phil. Geol. York. 
Vol. IT. t. 3. f. 14, 15, (not of Miller). 
Sp. Ch—Body broad, ovate, visceral portion convex, not much elevated ; cup rapidly expanding, conical ; 
pelvis pentagonal, very small, resembling a prominent rim to the very large circular columnar attachment, the 
diameter of which is three times greater than from its circumference to the edge of the pelvic plate; Ist 
primary radials (scapula) slightly convex, even, nearly twice as wide above as below, little wider than long; 
excavations for the 2nd primary radials (arm-plates) large, nearly half the depth of the 1st or scapulz ; capital 
plates variable in size and number, but large, few, unequal, polygonal, and most of them presenting a large 
conical protuberance in the centre ; entire surface smooth. Length of body ten lines, width between the arms 
nine lines. ; 
This species is excellently figured by Prof. Phillips (Geol. Yorksh.) with a doubtful reference to the 
P. levis of Miller. The latter species is, I believe, generally admitted now to be distinct; but having examined 
specimens agreeing with the above figure, I find the species to which it belongs differs both from that to which 
Goldfuss and that to which Mr Austin have referred it by the comparatively enormous size of the columnar 
attachment, and the narrow prominent rim to which the rest of the pelvis seems reduced. 
Position and Locality.The specimens aboye described are from the carboniferous limestone of Bolland, 
where it occurs in company with numbers of the P. pileatus, Gold. (P. antheliontes, Aust.), which it much 
resembles, but from which it is easily distinguished by the above characters. 
PLATYCRINUS PILEATUS (Gold.) 
Ref. and Syn.—Goldfuss. Nova. Acta. Akad. Nat. Cur. &c. Vol. XIX. t. 31. f. 7. 
= P. antheliontes Aust. Crin. t. 2. f. 3. 
Sp. Ch.—Cup expanding rapidly, conic; capital portion depressed; pelvis conical, rounded, columnar 
adherence small, its diameter scarcely equalling the shortest line from its circumference to the edge of the 
pelvis; Ist primary radials (scapulze) wider above than below, length and breadth nearly equal, arm-exca- 
vation large, depth rather more than one-third the length of the plate ; surface smooth ; capital plates large, few, 
polygonal, with a large more or less prominent conical umbo in the centre of most of them; mouth marginal. 
I do not think with Mr Austin that this is the crinoid figured by Phillips as the P. /evis of Miller; I have 
seen specimens from Bolland agreeing with Phillips’s figure in the great size of the columnar adherence, &c., and 
which are certainly distinct. (See P. megastylus.) 
Position and Locality.—V ery common in the carboniferous limestone of Bolland. (Bristol is the original 
locality given by Goldfuss.) 
PLATYCRINUS VESIcULosUS (M’Coy). PI. 3. D. fig. 3. 
Ref.—Ann. Nat. Hist. 2nd Series, Vol. II. p- 246. 
Sp. Ch.—Body spheroidal, depressed ; visceral portion hemispherical, deeper than the cup; pelvis penta- 
gonal, small, flattened ; Ist primary radials or scapula small, rotundato-quadrate, one-third wider than long, 
very thick, gibbous, slightly concave in the centre, lower edge hanging below the pelvis, excavation for the first 
arm-joint (or 2nd primary radial) very small, round, marginal, less than one-third the depth of the 1st primary 
