THE lOSSIL CRINOID GENUS DOLATOCRINUS AND ITS ALLIES. 41 

 Form 1. LIRATUS group. 

 Ten-arined: jiiediiijn to large size. 



DOLATOCRINUS LIRATUS HaU. 



Plate 10, figs. 10, 11. 



Cacabocriiius liratus Hall, Fifteenth Rep. New York State Cab., 1862, p. 139. 

 Dolatocrinus liratus Wachsmuth and Springer, N. A. Crin.Cam., 1897, p. 319, 



pi. 26, fig. 3. 

 Dolatocrinus liratus, vaf, multilira Hall, Fifteenth Rep. New York State Cab., 



1862, p. 139. 



Horizon avd locality. — Hamilton shales: near Bellona, New York. 



DOLATOCRINUS GLYPTUS Hall. 



Cacahocrinus glyptus Hall, Fifteenth Rep. New York State Cab., 1862, p. 140. 

 Dolatocrinus glyptus Wachsmuth and Springer, N. A. Crin. Cam., 1897, p. 317, 



pi. 26, figs. 2a, h. 

 Dolatocrinus glyptus, var. intermedius Hall, Fifteenth Rep. New York State Cab., 



p. 141. 



Ten-armed species of medium to large size, and strongly orna- 

 mented, the former with sharp radiating striae and the latter with 

 interrupted lines or pustules; in the former the calyx is wider and 

 lower than in the latter. The two species and varieties were not 

 illustrated b}^ Hall, but figures were given along with the redescrip- 

 tion of them by Wachsmuth and Springer, and I have figured two 

 typical specimens of liratus. Except for the difference in number of 

 primibrachs, it would be difficult to distinguish this species from 

 Stereocrinus triangulatus of the Michigan area. I have not the mate- 

 rial for a critical comparison of these forms, which will be done later 

 on by the New York State museum, and pending that I list the 

 varieties as synonyms under the respective species, as was done b}^ 

 Wachsmuth and Springer. An extremely abnormal specimen of this 

 type in the museum at Albany shows a single branching arm, which 

 is evidently sporadic. 



Horizon and locality. — Hamilton shale: Western New York. 



dolatocrinus ASPERATUS Miller and Gurley. 



Plate 6, figs. 5-12. 



Dolatocrinus ornatus, var. asperatus Miller and Gurley, Bvdl. 4, 111. St. Mus., 



1894, p. 15, pi. 3, figs. 4-6. 

 D. marshi, var. hamiltonensis Wachsmuth and Springer, N. A. Crin. Cam., 1897, 



p. 314, pi. 25, figs. 2a, h. 



As a hold-over from the Onondaga, this form became subject to 

 some extreme variations in surface characters, such as have been 

 relied upon with confidence by authors in their descriptions, and 

 some of which I am attempting to utilize further on in this paper to 

 assist in holding a number of described species Avhich probably 



