New Orders and New Families in the Class Echinodermata. 231 



This species is distinguished from Cyclonema varicosum by the 

 form of the aperture, which is higher than wide, and longitudinally 

 ovoid instead of as wide as high and transversely semioval; the colu- 

 mella is not so much lengthened, and is entirely destitute of the flat- 

 tening near the upper part, which is so striking a feature in the illus- 

 tration of HalFs species, in the 24th Rep. N. Y. St. Mus. of Nat. Hist. 

 It is, too, a much smaller species, and ornamented by more numerous 

 and more uniform revolving lines. It will be readily distinguished 

 from all forms figured by Prof. Meek, in the Ohio Palaeontology, vol. 1, 

 pi. 13, under the name of Cyclonema bilix, by the general form of the 

 shell and the character of ornamentation. 



I collected numerous specimens of this species in the shales of the 

 age of the Utica Slate Group, in the bank of the Ohio river, in the 1st 

 ward of the city of Cincinnati, and five miles above the latter place on 

 the Kentuck}' shore. Dr. R. M. Byrnes found it in the rocks of the 

 same age opposite the 5th street ferry, and E. O. Ulrich has collected 

 it in rocks of the same age at several places in the vicinity. Those in 

 m} T own collection vary in width from to inch, and in height 

 from y 2 ^ to -j^q inch; but the ornamentation and shape present a 

 striking uniformity throughout. The specimens illustrated are from 

 1113- own collection. I am not aware of the existence of the species 

 higher than rocks of the age of the Utica Slate. 



Cyclora pulcella, n. sp. 



[Plate IX., figs. 9, 9a and 96, magnified views, the natural size being shown by the line in 



the center between the three figures.] 



Shell small, rather wider than high, whorls three, which increase 

 rapidly in size, suture well defined, aperture somewhat circular, 

 umbilicus moderately large. Surface ornamented with numerous fine 

 lines, extending from the suture a little obliquely backward. The cast 

 of this species bears a resemblance to Cyclora minuta, from which it 

 is distinguished by its larger size and more rapidly swelling volutions. 

 The shell is distinguished b}^ these differences, and also by the surface 

 ornamentation. 



Shell about a line in height, and about a line and a half wide. 

 The author collected this species in the upper part of the Hudson 

 River Group, near Versailles, Indiana. 



