EcuinopeRMATA. | UPPER PALASOZOIC RADIATA. 117 
PoTERIOCRINUS NUCIFORMIS ((M/‘Coy). PI. 3. D. fig. 4. 
Ref—M°Coy. Ann. Nat. Hist. 2nd Series,-Vol. II. p. 245. 
Sp. Ch.—Body subovate, pointed below, contracted above from the upper margins of the Ist secondary 
radials (seapulee) being narrower than their lower portion ; pelvic plates long, pentagonal, very narrow below, 
giving a pointed appearance to the lower portion of the cup ; primary radials large, tumid, subhexagonal, nearly 
twice the length of the pelvic plates, a little less wide than long ; Ist secondary radials or scapulw pentagonal, 
about one-third wider below than above, giving a very perceptibly constricted appearance to the upper part of 
the cup; articulations for the free rays or 2nd secondary radials extending the whole width of the lst secondary 
radials or scapule ; irregular Ist interradial large, subhexagonal, supporting two small pentagonal 2nd inter- 
radials ; surface smooth. Length of cup eight lines, greatest diameter (at middle of primary radials) seven 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 have been published. 
Position and Locality—Not uncommon in the carboniferous limestone of Derbyshire. 
Explanation of Figures.—Plate 3. D. figs. 4, and 4a different profile views of one specimen, natural size. 
Genus. CUPRESSOCRINUS (Gold.) 
Gen. Char.—Column round or four sided, with a crucial alimentary canal; cup broad, shallow; pelvis 
pentagonal of five pentagonal joints, supporting five large pentagonal primary radials; alternating above which 
are five very wide and thick secondary radials or scapulee completing the cup; the arm articulation and 
articular ridge extend the entire width of the scapulze or Ist secondary radials; arms five, as wide as the 
seapule, rapidly tapering to an obtuse point, (not divided into hands or fingers) formed solely of plates 
of the secondary radial series. 
We might add to the above description, that between one pair of the Ist secondary radials or scapulze are 
three small interradial plates, not noticed by Goldfuss, but which I have observed in an authentic specimen from 
the Eifel of one of his species, and which tend to approximate the genus to Poteriocrinus, from which it differs 
in the very wide shallow form of the cup, and broad undivided rays. 
CUPRESSOCRINUS CALYX (M/‘Coy). PI. 3. D. fig. 1. 
Ref.—M°‘Coy, Ann. Nat. Hist. 2nd Series, Vol. II. p. 244. 
Sp. Ch.—Cup very wide, evenly convex, saucer-shaped, three times wider than long ; pelvis small, slightly 
concave, pentagonal, of five pentagonal pieces; alternating with and above which are five large primary radials, 
their length and width equal to the diameter of the pelvis, four pentagonal, and one with a very short sixth 
lateral side ; alternating with and above these, are five pentagonal Ist secondary radials (scapula), as long as 
the primary radials, but the width double the length; to the short side of the hexagonal Ist primary radial is 
obliquely attached a long pentagonal interradial supporting two very small 2nd interradial plates; scapule or 
Ist secondary radials very thick, articular surface flat with an articular ridge running its whole width; all the 
plates slightly convex and smooth. Width of cup nine lines. 
Position and Locality —Rare in the carboniferous limestone of Derbyshire. 
Explanation of Figures—P1. 3. D. fig. 1, basal view of specimen natural size.—Fig. 1 a profile of ditto. 
CUPRESSOCRINUS IMPRESSUS (A/°Coy). PI. 3. D. fig. 2. 
Ref—M°Coy, Ann. Nat. Hist. 2nd Series, Vol. II. p. 244 
Sp. Ch.—Cup four times wider than deep ; pelvis concealed in a deep circular pit, out of which spring the 
broad ends of five ovate-lanceolate primary radials, the apex of one of which is truncated to support a small 
elongate interradial plate, and on its side rests a somewhat larger Ist interradial plate; Ist secondary radials (or 
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 primary radials; substance of the joints very thick, projecting far 
