248 Mr. F. M‘Coy on some new Paleozoic Echinodermata. 
above and below flattened ; pelvis small, flattened, pentagonal, 
supporting on four of its sides four large hexagonal first-costal 
plates, about one-third wider than long, and on the fifth side 
one pentagonal plate; the five regular second costals are scarcely 
one-third wider than long, smaller than the first-costals and 
hexagonal, with the two upper lateral sides so short as some- 
times to make the plates seem quadrangular ; intercostals hex- 
agonal, longer than the first-costals ; pectoral plates rather 
large, flat, polygonal ; scapule pentagonal (or occasionally with 
the upper lateral angles truncated so as to be slightly hepta- 
gonal), one-third shorter than the first-costals ; interscapulars 
heptagonal or octagonal, as long as the intercostals; the sur- 
face of all the plates marked with minute vermicular wrinkles. 
Diameter of cup 1 inch 9 lines. 
The sculpturing resembles that of the A. (Amphoracrinus) am- 
phora, from which the species is distinguished by its round inflated 
pot-like figure, small arm-bases, proportionate length of the 
costals, &e. 
Very common in the Derbyshire carboniferous limestone in 
company with the Potertocrinus granulosus. 
(Col. University of Cambridge.) 
Actinocrinus (Amphoracrinus) Atlas (M‘Coy). 
Sp. Char. General figure of body elongate-oval, diameter between 
the arms little more than half the height of the body ; pelvis 
pentagonal, of three thick flattened jomts ; first-costals small, 
one pentagonal and five wider heptagonal, the latter nearly twice 
as wide as long ; second costals as long as the first, but only 
one-third wider than long, hexagonal or sometimes quadrate 
(according as the upper lateral angles are entire or slightly 
truncated) ; scapule short, pentagonal, as wide as the second 
costals ; intercostals hexagonal, exceeding the first-costals in 
length ; arm-bases prominent, and over each is an elongate 
conical tubercle ; pectoral plates rather large, convex and irre- 
gularly polygonal; vertex covered by a very large hemisphe- 
rical plate, surrounded by six slightly smaller polygonal ones 
having a large conical protuberance in the middle ; mouth lon- 
gitudinally oval, rather nearer the vertex than the arm-base 
over the pentagonal first-costal, to which it inclines; all the 
plates except the large ones of the vertex marked with minute 
vermicular wrinkles. Length from pelvis to plate on vertex 
13 inch, diameter between the arms 10 lines. 
The enormous size of the visceral portion above the arms 
(nearly three times the height of the cup) has suggested the spe- 
cific name for this crinoid, which resembles the 4. (Amphoracrinus) 
Gilbertsoni and A. (Amphoracrinus) amphora in its markings, pro- 
