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. 



Teleioerinus rudis Hall. 

 Plate LIX. Figs. 1, 2, 3. 



I860. Actimcrinm rudis — Hall; Suppl. Geol. Rep. Iowa, p. 33. 

 1873. Slrolocrinus rudis — Meek and Woethen ; Geol. Kep. Illinois, Vol. V., p. 349. 

 1881. Teleioerinus rudis, W. and Sp. ; Revision Palaeocr., Part II., p. 149. 

 1889. Teleioerinus rudis — S. A. Milleu; North Amer. Geol. and PalaBont., p. 286. 

 Syn, Aetinoerinus clivosus- — Hall; 1861, Boston Joum. Nat. Hist, p. 274. 



Strotoeriims elivosus — Meek and Woethen ; Geol. Rep. Illinois, Vol. V., p. 349. 

 Teleioerinus clivosus — W. and Sp. ; Revision Palaeocr., Part 11., p. 149. 

 Sjn. Jclinocrinus {Calalhocrinus) erodits Hall; 1861, Prelim. Dcscr. Palfeoz. Grin., p. 12. 

 Strotoerinus erodus — Meek and Woethen ; 1866, Geol. Rep. Illinois, Vol. II., p. 190. 

 Teleioerinus erodus — W. and Sp. ; Revision Palaeocr., Part II., p. 149. 

 Syn. Actinocri?ms (JOalulhocrinus) inseulpUis Hall; 1861, Prelim. Descr. Pal. Grin., p. 12. 

 Strotoerinus inseulptus — Meek and Woetben ; Geol. Rep. Illinois, Vol. V., p. 349. 

 Teleioerinus insculptus — W. and Sp. ; Revision Palseocr,, Part II., p. 149. 



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 cujj 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-i'adial 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 middle 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; 



