236 Cincinnati Society of Natural History. 



oiial outline. In the onl}'' arm preserved in our specimen the fii'st bi- 

 furcation takes place on the sixth plate from the first radial. 



Column pentagonal at the bod}', but graduall}' changing to cylindri- 

 cal below. In the length preserved in our specimen, it has tapered to 

 one half the size at the body, and from the appearance, I infer that the 

 column in this species is short and tapers to a point. 



The species is founded upon the specimen illustrated, which I found 

 in rocks of the age of the Utica Slate, within six feet of low- water mark 

 of the Ohio river, in the first ward of Cincinnati. It bears some re- 

 semblance to Dendrocrinus dyeri (Meek), but may be distinguished 

 by the more angular outline of the body, greater diameter at the first 

 radials, and also b}' the form of the plates. 



Orthoceras dyeri (S. a. Miller). 



Plate VII., fig. 7, external view, natural size. 

 This species was .described in the Cincinnati Quarterly Journal of 

 Science, Vol. 2, p. 125 (1875). and illustrated by a sectional view rep- 

 resenting the si ph uncle. 



The shell is rapidl}^ tapering, chambers large, septa highly arched, 

 and distant about one fifth the diameter of the shell. Siphuncle large, 

 subcentral, and presenting the appearance of a string of oblate, 

 spheroidal beads, having the same inclination as the septa between 

 which the}' occur. Greatest diameter of the siphuncle nearly one third 

 thediameter of the shell. Chamber of habitation lai-ge. Some of the shell 

 preserved upon the chamber of habitation indicates that the surface of 

 the shell is smooth. 



It is readil}' distinguished from other species found in our rocks, by 

 the rapidly tapering shell and the great distance between the septa, and 

 in cut sections b\' the form of the siphuncle. It is, however, a rare 

 species. The specimen illustrated is from my collection, and was found 

 in the Hudson River Group, near the top of the hill west of the city of 

 Cincinnati, at an elevation of about 400 feet above low-water mark of 

 the Ohio river. 



PaL.E ASTER CLARKANA, U. Sp. 



In July, 1878 (Jour. Cin. Soc. Nat. Hist. Vol. 1, p. 102, pi. 3, fig. 5), 

 I described a small Palseaster under the name of Paloiaster clarkei. 

 It appears, however, that this name was preoccupied b}' de Konninck, 

 in 1876 (Recherches sur les FossilesPaleozoiques de laNouvelle-Galles 

 du Sud. p. 106, pi. 7, fig. 6 and ^a). Such being the fact, 1 now pro- 

 pose, for the species which I described as Paloiaster clarkei, the name 

 Palceaster clarkana. 



