Notes on Cincinnatian Fossil Types 
341 
formation and area, extending its range into western Tennessee. 
In Carney ella the five plates occupying the interradial angles differ 
in form from the lateral covering-plates characterizing the rays; this 
is true especially of the two anterior and of the conspicuous posterior 
supra-oral plates (1872, Hall, 24th Rep. N. Y. St. Mus., pi. 6, figs. 8, 9; 
1914, Foerste, Bull, Denison Univ., 17, pi. 1, fig. 5B). In Isorophus 
the spura-oral plates differ only slightly from the lateral covering- 
plates of the rays, and the genus is regarded as more primitive in 
type. To Isorophus are referred Agelacrinus cincinnatiensis, Roemer, 
Agelacrinus holhrooki, James, and Lehetodiscus inconditus, Raymond. 
In all of these species accessory covering-plates are present along 
the median line of the rays. To Carneyella are referred Agelacrinus 
pileus, Hall, Agelacrinus billingsi, Chapman, Lehetodiscus chapmani, 
Raymond, Lehetodiscus youngi, Raymond, Lehetodiscus platys, Ray- 
mond, Lehetodiscus multihrachiatus, Raymond, and Agelacrinus 
vetustus, Foerste. None of these species possess accessory covering- 
plates along the median line of the rays. On that account it is 
suspected that Agelacrinus austini, Foerste, in which the supra-oral 
area is not distinctly preserved, will prove to belong to the Isorophus 
group. 
In Lehetodiscus dicksoni, Billings, and Lehetodiscus loriformis, 
Raymond (1915, Raymond, Ottawa Naturalist, p. 53), all the rays 
are contra-solar. The supra-oral plates differ from the lateral 
covering plates of the arms merely in their smaller size. From the 
median ridge of the covering-plates short ridges extend off laterally, 
excepting at the tip of the plates, where the median ridge broadens 
out. There are no accessory plates along the median line of the rays. 
The name Carneyella is proposed in recognition of the valuable 
contributions of Prof. Frank Carney to physical and glacial geology. 
