64 NEW YORK STATE MUSEUM 



Cyphaspis hudsonica sp. nov. 

 PI. 4, fig. 8, 9 



In this connection may be mentioned a ■cranidium found in the 

 upper Utica shale of Green Island (see state museum, Bui. 

 42, p. 526) which, though somewhat defective, deserves notice on 

 account of the rarity of this genus in these lower terranes, and 

 the fact that no representative of the same has as yet been 

 observed in the Utica shale. 



The glabella is broadly subovate, with a subangular frontal 

 lobe, truncate behind, flanked by deep dorsal furrows, 

 moderately convex (apparently somewhat compressed as indi- 

 cated by a longitudinal median fold); the basal lobes are 

 distinctly set off; the full extent of the basal glabellar furrow 

 is, however, not known; no other glabellar furrows are observ- 

 able. The frontal limb is only little depressed below the surface 

 of the glabella in front of the latter, and slopes but slightly to- 

 ward the frontal rim, more rapidly toward the facial sutures ; the 

 frontal rim is thick, almost vertically upturned, forming part of 

 a curve; from the intersection with the frontal rim the facial 

 sutures turn obliquely toward the basal lobe, running then 

 parallel to the dorsal furrow, and leaving a small strip at the 

 side of the glabella. 



Though this is all that is known of this species, it is .sufficient 

 for the generic determination of the form, and the demonstra- 

 tion of the presence of the genus within the Utica beds. This 

 form closely approaches most Skumard's C. girardeau- 

 e n s i s, and differs apparently only in the greater breadth of the 

 frontal limb left between the facial sutures, which intersect the 

 frontal rim farther back, and approach the glabella more rapidly 

 in that western form. It is also similar to C. m a t u t i n a in 

 all parts except the narrower frontal limb; the rim in the 

 Trenton form is only little upturned and rather flat, but here 

 thick and sharply upturned. More extensive material may 

 necessitate uniting both the Trenton and Utica forms under 

 one specific name. With our present knowledge it would seem 



