296 Field Columbian Museum — Geology, Vol. II. 



1894 Saccocrinus howardi S. A. M., 18th Rept. Geol. Surv. Ind., 



p. 284, PI. V, Figs. 3-5. 

 1897 Periechocrinus howardi W. & Sp., N. Am. Crin. Cam., Vol. 



II, p. 529. 

 Niagara Group, St. Paul, Indiana. 



Habrocrinus ornatus Hall. 



1875 Saccocrinus ornatus Hall, Pal. Ohio, Vol. II, p. 126, PI. VI, 



Figs. 7-9. 

 1 88 1 Periechocrinus ornatus Wachsmuth & Springer, Rev. Pal- 



aeocr., Pt. II, p. 132. 

 1897 Periechocrinus ornatus Wachsmuth & Springer, N. Am. 



Crin. Cam., Vol. II, p. 527, PI. L, Figs. 3a-b, and PI. LI, 



Fig. 7. 

 Niagara group, Yellow Springs, Ohio. 



Habrocrinus farringtoni sp. nov. Plate LXXXVII, Figs. 1-5. 



The calyx is urn-shaped, with an expanded hexagonal base. The 

 dome is not preserved. The plates of the dorsal cup are thick, depressed 

 in the center, with low nodes near the angles. The sutures are sit- 

 uated in deep furrows formed by the beveled edges of the plates. No 

 radial ridges are found. The natural casts have a pronounced 

 tubercle near the center of the radial and first anal plates, indicating 

 a depression on the inner side of the plates, but no corresponding 

 elevation, on the exterior of the plates, is shown in the natural mold. 

 The natural casts are pyriform, pointed below and truncated above, 

 somewhat constricted between the prominent arm bases. Arms, 

 judging from the arm bases, two to each ray. 



Basals three, equal, forming a shallow hexagonal cup. Radials 

 five, height and width about equal ; the two anterior laterals heptag- 

 onal, the others hexagonal. First costals hexagonal, about half the size 

 of the radials; second costals smaller than the first, pentagonal, axil- 

 lary, bearing the distichals upon their superior edges. First distichals 

 about twice as high as wide. Higher plates of the rays not known. 

 First interbrachials hexagonal, equal in size or slightly larger than the 

 first costals; they are followed by two somewhat smaller plates, and 

 these by two still smaller which join with the plates of the dome. No 

 interdistichal plates visible. The anal interradius has nearly the 

 combined width of one of the rays and two interbrachial areas. The 

 first anal plate is situated between the two posterior radials, resting on 

 the basals. It is heptagonal in form and from its superior edge extends 



