388 SMITHSONIAN INSTITUTION 



Anal tube not preserved, but evidently small, resting on narrow post. B. iBr 1, 

 small. Column next to calyx strong, composed of thin columnals which after 

 a short interval begin to enlarge in diameter downward instead of diminishing, 

 soon changing rather suddenly to much longer, convex ossicles; these increase 

 in length and width for some distance, and then diminish, becoming narrower 

 and more uniform toward the end, which is not preserved. Dimensions of 

 medium specimen with nearly complete stem; crown, 20 mm. high by 14 mm. 

 wide; base, 4 mm. ; calyx, 7 mm. high by 10 mm. wide at IBr 3 . 



The peculiar median swelling of the stem is the most interesting feature of this species ; 

 it is plainly shown in the type, but much better by the beautifully perfect specimen in my own 

 collection. It may be compared with Euta.vocrinus ithacensis as to the stem, in which, how- 

 ever, there are distinct differences. In the young specimens the distal increase in the stem 

 is not apparent so far as preserved. The species is one of the earliest Carboniferous occur- 

 rences of the genus, being found in the same locality and beds immediately succeeding the 

 Devonian with T. kelloggi, from which it is thoroughly distinct. 



Hall figured under this species three specimens, of which only the first one, figure 3 of 

 the Ohio Report, belongs here. The others, Palaeontology of Ohio, plate 12, figures 4 and 5, 

 must go under Forbesiocrinus. 



Types. Hall's original, Plate LII, figure 1 herein, and those of figures 2 and 3, are in the 

 New York State Museum, Albany ; that of figure 4 is in the author's collection. 



Horizon and locality. Lower Carboniferous, lowest part of Waverly group, Cuyahoga 

 shales ; Richfield, Ohio. 



Taxocrinus kelloggi (Hall) 

 Plate LII, figs, fja-c 



Forbesiocrinus kelloggi Hall, Prelim. Notice 17th Rep. New York St. Cab. Nat. Hist, 1863, p. 7; Final 



Rep., 1864, p. 56. — Hall and Whitfield, Geol. Surv. Ohio, Pal., II, 1875, p. 171, pi. 12, fig. 1. 

 Taxocrinus kelloggi, Meek and Worthen, Proc. Acad. Nat. Sci. Philadelphia, 1865, p. 140; Geol. Surv. 

 . Illinois, II, 1866, p. 270. — Wachsmuth and Springer, Revision Palaeocrinoidea, pt. I, 1879, p. 49. 



A small species, with elongate crown and broad, low base ; height to width 

 at second axillary 1.6 to 1. Calyx broadly rounded below, spreading rapidly to 

 radials, thence but little to I Ax; spread from base to middle of RR, 1 to 2.2; 

 from RR to I Ax, 1 to 1.2. IBr diminishing upward. Arms heavy, deeply 

 rounded, tapering but little, and strongly divergent leaving wide iBr spaces; 

 bifurcating three times before infolding, with strong nodes on the axillaries; 

 sutures arcuate. Surface otherwise smooth. Height of crown, 21 mm.; width, 

 13 mm. ; base, 4 mm. 



IBB low, visible; BB small, acute-angled. RR the largest plates in the 

 calyx. IBr smaller, and narrowing upward to the axillary, which is about as 

 wide as the next preceding plate. IBr 3; IIBr 5; IIIBr 5 to 7. Anal tube 

 slender, composed of elongate plates; iBr 1, followed by perisome. Column 

 large at calyx, with very thin columnals, tapering gradually, with alternate 

 ossicles becoming longer and convex. 



