CALYPTOCRINID^. 353 



twice as long as wide, occupying fully one half tlie length of the dorsal cup. 

 The tube in its free state was covered by large hexagonal plates, very 

 regularly arranged. 



Horizon and Locality. — Niagara group ; Pontiac, 0. 



EemarJcs. — Miller described this species from a plaster cast in the pos- 

 session of Mr. A. McCord of Oxford, Butler Co., 0. 



Eucalyptocrinus obconicus Hall. 

 Plate LXXXIII., Fig. IS, 



1867. Hall; 20th Rep. N. Y. State Museum Nat. Hist., p. 323, Plate 11, Fig. 1. 

 1885. W. and Sp. ; Revision Palseocr., Part III., p. 133. 



Differing from all other American species of this genus in the arrange- 

 ment of the basals, which form an obconical cup instead of being placed 

 within a concavity. Dorsal cup very long, sometimes almost twice as high 

 as wide, sharply pointed at the lower end, the sides straight to near the top, 

 where they slightly contract. Radials once and a half as long as wide, but 

 very little tapering, the sloping upper faces quite small. First costals 

 quadrangular, as long as wide, the upper face narrower than the lower; the 

 second costals of about the same size as the first, but pentangular. First 

 distichals comparatively large, those of the same ray in contact laterally ; 

 the second very small. First interbrachials nearly twice as long as wide, 

 widest at midway ; the two of the second row shorter. Interdistichals 

 unusually small, resting upon the sloping upper faces of the first distichals. 

 All other parts unknown. 



Horizon and Locality, — Niagara group ; Racine, Wise, and Chicago, Ills. 



1850 

 1878 

 1879 

 1881 

 1890 



CALLICRINUS d'Okbigny. 



WOb.'BIG'^y {Calliocrimis)', Prodrome, Vol. I., p. 45. 



Angelin; Iconogr. Crin. Suec, p. 14. 



Zittel; Handb. d. Palseont., Vol. I., p. 378. 



W. and Sp. ; Revision Paleeocr., Part III., p. 135 (Proceed. Acad. Nat. Sci. Pliila., p. 357). 



Ringuebeeg; Annals N. Y. Acad. Sci., Vol. V., p. 302. 



Syn. Eugeniacrinites Hisinger (not J. S. Miller), 1857, Letlisea Suec, p. 86. 



Syn. Euccdijptocri?ius (in part) Hall; N. Y. State Mus. Nat. Hist., p. 322 (20tli Rep.)- 



In its general aspect, in the form of the calyx and arrangement of the 

 plates, closely resembling Eucalyptocrinus. The calyx also has the form of 

 a wine bottle with long slender neck, and a deep concavity at the bottom ; 

 but the partition walls, instead of forming closed compartments to the full 



45 



