FOSSILS OF THE BUlIUN<rTOX GROUP. 355 



Hight of body to horizon of arm openings, 0.70 inch ; 

 breadth at same, 1.60 inches. 



This species resembles in the sculpturing of its body plates S. glyptu-s, 

 Hull isp.), but has a more depressed body, and is also at once distin- 

 guished by having a proboscis, while the 8. glyptm belongs to the sec- 

 tion of the genus with merely a simple opening in the vault. From 

 S. cegilopa it will readily be distinguished by its shorter, more rapidly 

 expanding body and less numerous arms, as well as by its different 

 .sculpturing. Although its brachial pieces are a little separated over 

 the anal, interradial, and axillary spaces, there are no distinct sinuses 

 at these points in the margins of the disc, as the little intercalated 

 pieces separating the brachial pieces at these places extend out as far as 

 the latter, so that when the arms are removed, the outline of the disc 

 presents only an obscurely sub-pentagonal outline. 



Locality and position Lower division, Burlington beds of Lower 

 Carboniferous, at Burlington, Iowa. No. 59 of Mr. WACHSMUTH'S col- 

 lection. 



STROTOCRDTUS LIRATUS, Hall, (sp.) 



PL 7, Kg. 2. 



ActirwcrinHS liratu*. HALL. Supplement to Iowa Geological Report Vol. I, part 2, 1860. 



Actinocrimu fiibumbrosu*, HALL. Ib. p. 3, I860. 



Strotocrinus Kratu*, MEEK and WOBTHEN. Illinois GeoL Report, Vol. n, p. 190, 1866. 



BODY attaining a large size, urn-shaped, being rather 

 elongate-obconic below the horizon of the arm-bases, and 

 depressed convex above ; sides expanding gradually from 

 the base to the top of the secondary radial pieces, and then 

 abruptly curving outward horizontally to the arm-bases. 

 Base nearly twice as wide as high, truncated, and rather 

 deeply excavated below, for the reception of the end of the 

 column, and notched at the sutures so as to present a trilo- 

 bate appearance. First radial pieces generally a little 

 longer than wide, hexagonal and heptagoual in form. 

 Second radial pk-r> -< arcely more than one-third as large 

 as the first, as wide as long, and all hexagonal. Third ra- 

 dials as large as the second, or sometimes slightly larger, 

 heptagonal or octagonal, aud each bearing on its superior 

 sloping sides. TWO secondary radials, each of which bears 



