ANIMALS. ae 
ENCRINITES RAMOSUS, Schl. Geol. Russ. vol. i, p. 221, 1845. 
CYATHOCRINITES PLANUS, Miller. Geinitz, Grundriss, p. 548, 1846. 
EncrINITES RaMosuS, Schl. Tennant, Strat. List., p. 88, 1847. 
CYaTHOCRINUS — » King, Catalogue, p. 6, 1848. 
ENcCRINITES PLANUS, Miller. Howse, 'T. N. F. C. vol. i, p. 261, 1848. 
CYATHOCRINUS RAMOSUS, Schl. Geinitz, Versteinerungen, p. 16, pl. vil, figs. 3-6, 1848. 
Diagnosis.— Cup twice as wide as it is high at the margin ; sides at an angle of about 
fifty degrees. Basal or pelvic plates diamond-shaped; imner portion the longest. 
Supra-basal or costal plates, four normals pentagonal ; inferior margin slightly convex ; 
sides of nearly equal length: modified plate six-sided: surface of all a little rounded. 
Marginal or scapular plates, brachials pentagonal; with the latero-superior angles 
truncated ; twice as wide as itis deep ; upper margin slightly concave : articulating areas 
marginal ; nearly as wide as the upper margin of the plate: abrachial plate irregu- 
larly six-sided : supplementary abrachial four- or five-sided. Co/wmn branched, rounded, 
with (?) both plane and beaded internodes, and a pentagonal canal: articulating 
surfaces slightly concave; with an inner granulated area, and an outer radiately- 
marked zone. 
The marginal plates (Pl. VI, fig. 18 e) of the cup of this Cyathocrine are unusually 
broad compared with their depth, and the size of the supra-basal plates (c). The conse- 
quence is, that the cup is much wider at the top than at the base. The basal plates, in the 
only cup I have seen, and which is the one figured, have their surface broken off ; it 1s 
therefore impossible to say whether they were rounded, thereby giving the lower part 
of the cup a corresponding form, or level, with a surface at the same angle as the 
plane of the upper plates, making the entire sides of the cup entirely flat, and 
passing continuously so into the column. It is suspected, however, that the latter 
character obtained. There are two kinds of internodes occurrmg in our rocks: 
the commonest is plane (PI. VI, fig. 20): and the rarest is beaded (Pl. VI, fig. 19): 
both probably belong to the same species, since other Crinoideas, e. g. Ancrinus 
hliformis, are known to possess a column composed of both plane and beaded internodes. 
Dr. Geinitz figures only plane internodes; but Schlotheim has represented beaded 
examples in pl. iii, figs. 11, 12, of his ‘ Beitrage.’ I have not yet succeeded in procuring 
any specimens of the arms or the branches of Cyathocrinus ramosus ; though single 
joimts have now and then occurred to me. Schlotheim erroneously figured specimens 
of Thamniscus dubius and Acanthocladia anceps, as arms, or branches; but the only 
representation given by the Baron, and referable either to the one or the other of 
these appendages, is under fig. 10, in his 11th plate, which exhibits them imcrusted 
with a Stenopora columnaris. 
The author of the ‘ Natural History of the Crinoidea,’ simply from an examination of 
the columns of this species, was led to identify it with his Cyathocrinus planus ; the cup, 
however, shows it to be very distinct from the latter, particularly in the width of its 
marginal or scapular plates. 
