116 



Cincinnati Society of Natural History. 



DESCRIPTION OF THREE NEW SPECIES AND RE- 

 MARKS UPON OTHERS. 



By S. A. Miller, Esq. 



SUBULITES GRACILIS, n. sp. 

 Plate V., Fig. 5, natural size. 



Shell slender, elongate, fusiform, terebriform, and consisting of nine 

 or ten volutions. The body volution forms more than one third the 

 length of the shell. The aperture is narrow, elongate and terminal 

 below. Suture well marked on the cast. Surface of the shell un- 

 known. 



This species is distinguished from others by its slender form and 

 numerous whorls, and from S. terebriformis, in rocks of the same age, 

 by the additional fact that it has a much shorter proportional body 

 whorl. The species is founded upon two specimens, one of which 

 shows the lower whorls, and the other the upper whorls of the cast. 



Formation and locality: In the magnesian limestones of the 

 Niagara Group, at Chicago, Illinois. Collected b} T W. C. Egan. 



Protaster miamiensis, n. sp. 



Plate V., fig. 6, natural size ; fig. 6a, oral pieces magnified eight diameters ; 66, portion 



of an arm magnified three diameters. 



This species is large, with a proportionally small disk. A specimen 

 having a disk four tenths of an inch in diameter, has rays an inch in 

 length. Five specimens have been examined, all showing the ventral 

 side. The dorsal side is unknown. Only that part of the disk be- 

 tween the rays is visible in an}' of the specimens, and the plates are 

 so anch} T losed together that no special definition of them can be given. 

 The ra3^s are long and coarser and stronger than usual in this genus, 

 though they were quite as pliable and flexuous when living as others. 

 Two series of subquadrangular plates, or ambulacral ossicle, alter- 

 nating with each other, constitute the bottom of each ambulacral fur- 

 row; these are bordered by spinous adambulacral plates, which ter- 

 minate at the angles of the mouth in only five oral plates. 



This description does not conform exactly with some of the defini- 

 tions of the genus Protaster, but, nevertheless, I am inclined to refer 

 the species, without much hesitation, to this genus. 



Formation and locality: From the upper part of the Hudson River 

 Group, near Waynesville, Ohio, and belonging to the magnificent col- 

 lection of I. H. Harris, Esq., of that place. 



