} 
630 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
number of arm openings or the number of arms as a specific character, unless 
the relative maturity of the individual is considered. The two figures on 
Plate LX. give the most extreme forms of this species; as a rule, the plates 
are neither so smooth nor so nodose as in those specimens, 
Teleiocrinus rudis Hatt. 
Pie LEX, Figs. 1, 2,3. 
1860. Actinocrinus rudis —Hati; Suppl. Geol. Rep. Iowa, p. 33. 
1873. Strotocrinus rudis — MEK and WortuEn; Geol. Rep. Illinois, Vol. V., p..349. 
1881. Teleiocrinus rudis, W. and Sv.; Revision Paleocr., Part II., p. 149. 
1889. Teleiocrinus rudis—S. A. Mitier; North Amer. Geol. and Paleont., p. 286. 
Syn. Actinocrinus clivosus — Haut; 1861, Boston Journ. Nat. Hist., p. 274. 
Strotocrinus clivosus —Mnnx and WortHEn; Geol. Rep. Illinois, Vol. V., p. 349. 
Televocrinus clivosus — W. and Sp.; Revision Paleoer., Part IL, p. 149. 
Syn. Aetinocrinus (Calathocrinus) erodus Hatt; 1861, Prelim. Descr. Paleoz. Crin., p. 12. 
Strotocrinus erodus — Munk and WortuEn; 1866, Geol. Rep. Illinois, Vol. II., p. 190. 
_ Televoerinus erodus — W. and Sp.; Revision Paleocr., Part II., p. 149. 
Syn. Aetinocrinus (Calathocrinus) insculptus Hatt; 1861, Prelim. Deser. Pal. Crin., p. 12. 
Strotocrinus insculptus — Mpux and WortHeEn; Geol. Rep. Illinois, Vol. V., p. 349. 
Televocrinus insculptus —W. and Sp.; Revision Paleocr., Part II., p. 149. 
a een —=e ee 
A very nodose species, about the size of the preceding. Calyx to the 
base of the tube a little higher than its width at the base of the free arms. | | 
Dorsal cup obconical to the bottom of the rim, and fully as high; the sides 
almost straight. The rim begins to expand from the top of the distichals; it 
is directed obliquely upward, and is less prominent than usual in this genus, 
Ventral disk depressed-convex, somewhat decagonal in outline. Plates of 
the cup massive and extremely rugose, the surface being full of wrinkles 
and pits, and covered with all kinds of nodes and ridges, which give it a 
corroded appearance. The basi-radial sutures are traversed by several 
ridges, which generally unite at or near the middle of the radials into a 
prominent node, the centre of which is depressed into a deep subcircular pit. 
The middie part of the other plates to the height of the distichals is abruptly 
elevated into a large node, which is transversely elongate upon the brachials, 
and rounded on the interbrachials. The plates of the rim are marked 
by high, angular, zigzag ridges, which follow the different ramifications of 
the rays. , 
. 
= 
Basals large, irregularly thickened, their lower ends produced into six | 
angular processes, two from each plate, which pass down to the second or third 
stem joint; they are deeply grooved along the sutures, and project in form 
of a tripetalous rim over the column. Radials large, their length and width 
about equal. First costals less than half the size of the radials, hexagonal; 
