Mr. F. M‘Coy on some new Paleozoic Echinodermata. 245 
cated to support a small elongate interscapular plate, and on 
its side rests a somewhat larger intercostal plate; scapule 
about one-third wider than long, pentagonal, the two lower 
sides concave, and the lower angles very much prolonged to 
fit between the lanceolate costals ; substance of the jomts very 
thick, projecting far into the visceral cavity, a strong perfo- 
rated articular ridge runs across the top of the scapule ; all 
the plates slightly convex and smooth. 
Distinguished from the C. calyx by its deeply impressed pelvis 
and long, lanceolate first-costals. 
Not very uncommon in the carboniferous limestone of Derby- 
shire. 
(Col. University of Cambridge.) 
(Semiarticulata.) 
Poteriocrinus nuciformis (M‘Coy). 
Sp. Char. Body subovate, pointed below, constricted above from 
the upper margins of the scapule being narrower than their 
lower portion ; pelvic plates very small, form unknown ; first- 
costals long, pentagonal, very narrow below, giving a pointed 
appearance to the lower portion of cup; second costals large, 
tumid, subhexagonal, nearly twice the length of the first- 
costals, a little less wide than long; scapule pentagonal, about 
one-third wider below than above, giving a very perceptible, 
constricted appearance to the upper part of the cup, articula- 
tions apparently the whole width of the plate; irregular in- 
tercostal large, subhexagonal, supporting two small pentagonal 
interscapulars ; surface smooth. Length of cup 8 lines, greatest 
diameter (at second costals) 7 lines. 
This closely resembles the P. Bockschii figured by Geinitz in 
his ‘Grundriss der Versteinerungskunde,’ t. 23. f. 13, but of 
which no description or definition has been published. 
Not uncommon in the carboniferous limestone of Derbyshire. 
(Col. University of Cambridge—two examples.) 
Poteriocrinus crassimanus (M‘Coy). 
Sp. Char. Column small, of thin circular joints ; supracolumnar 
joint supporting five pentagonal first-costals, slightly wider 
than long, between and above which rest five pentagonal sca- 
pule about as long as the costals, but about one-third wider 
than long, each of which supports one large cuneiform arm- 
joint, wider than long, from each of which proceed two hands 
of six joints each, thicker on alternate sides, the last joint 
cuneiform and supporting two fingers of about thirty-five 
joints, each wider than long; costal and scapular plates ra- 
