Descriptions of New Fossils. 177 
DESCRIPTIONS OF NEW FOSSILS FROM THE LOWER 
SILURIAN AND SUB-CARBONIFEROUS ROCKS 
OF KENTUCKY. 
By A. G. Weruersy, A.M., 
Prof. Geology and Zoology, University of Cincinnati. 
AmyepatocystitEs, Billings. Can. Jour. vol. ii., 1854. 
AMYGDALOCYSTITES HUNTINGTONII, nov. sp. 
Ovate, somewhat wider at the apical end, gradually narrowing be- 
low. Length 36, breadth 28 mm. The body is composed of hexagon- 
al and octagonal plates, arranged without regular order. The octa- 
gonal plates are larger than the others, but have no order of position. 
In sculpture and ornamentation they are identical with the smaller 
ones. The anal (?) aperture is situated very near the center of the 
apex, at the dorsal side of the shorter arm. It is closed by a series of 
valvular plates, as shown in figure 3, Pl. V. The arms are so arranged 
‘as to form a continuous ridge, the longer one beginning at the ambu- 
lacral orifice, at the right outer curve of the apical extremity, and 
extending down their side quite to the column, and consisting of twenty 
plates. Theshorter, consisting of seventeen (?) plates, extends over the 
apex, to a point on the side opposite the lower margin of the ambu- 
lacral aperture. The plates of the shorter arm near this orifice, and 
forming the summit of the specimen, are much larger than the others. 
The plates of the longer arm are nearly equal in size. The pinnule are 
absent inthe specimen. The ambulacral groove faces the anal (?) open- 
ing in the longer arm, and is placed upon the opposite side of the 
shorter. The column is round. This species differs from the A. 
florealis of Billings, the only described species with which any com- 
parison is necessary, both in the sculpturing of the plates, and in the 
length of the arms, as well as in the general form. 
The specific name is given in honor of my friend, Geo. 8. Hunt- 
ington, Esq., Civil Engineer of the C. H. & D. R. R., who discovered 
it in the Trenton rocks of Mercer county, Kentucky, at High Bridge, 
and to whose cabinet the type belongs. 
CysTIDEAN. New Genus and Species. 
I herewith figure, Plate V., figs. 2 and 2a, a remarkable Cystidean, 
_ for which, at present, I give no name, either specific or generic, as I 
