224 NEW YORK STATE MUSEUM 



PLATE lo 



(All originals in state museum unless otherwise stated) 



Lepidodiscus alleganius sp. nov. 



p. 194 



Fig. 



1 A yoiinj!: individual, oral aspect. The rays are direct or but 



slij^btly undulating, reach the margin and terminate there 

 if not extending somewhat on to the lower surface of the 

 test. The structure of the rave and mouth is lost, but the 

 former are seen to lie in well defined grooves, x IJ 

 Chemung sandstones. Tvoose ;it Alfred N. Y. 



2 The aboral a9i>ect of a large individual, showing the depressed 



surface of imbricating plates directed centrifugally and the 

 projecting margin of coarser plates. Normal size 

 Chemung sandstones. Loose at Belvitiere N. Y. 

 n Oral aspect of a mature individual, showing the extremely 

 narrow undulating whi])lash rays, all solar; the elongate 

 oral aperture and mode of divergence of the rays therefrom; 

 the fine interlocking line of the cover platee. Also the 

 position of the anal pyramid and the a'bsence of specially 

 differentiated marginal plates, x 1^ 

 Chemung sandstone. 2 miles north of Sabinsville, Tioga 

 CO. Pa. 



4 Oral aspect of another adult, showing similar characters, some 



of them more pronounced. Here the anal pyramid shows 

 its composition of 10 triangular plates, x IJ 

 Chemung sandstones. Loose at Alfred N. Y. 



5 Aboral aspect of a large individual 

 Chemung sandstones. Loose at Belvidere N. Y. 



Agelacrinites hamiltonensis Vanuxem 

 p. 184 



6 A drawing made from a gutta-percha replica of the original. 



Thia replica, on comparison with Vanuxem's figure in the 

 report on the geology of the third district, is seen to lack 

 partfi of two individuals, but it shows the detailed structure 



