(J4 NEW YORK STATE MUSEUM 



Cyphaspis hudsonica sp. nov. 

 PL 4, fi-. 8, • 



In this coniuHtion may be mentioned a cranidium found in the 

 upper rtica shak* of Green Island [see state museum, Bui. 

 42, p. 52(5) wliieh, lhouji;h somewhat defective, deserves notice on 

 account of the rarity of this genuc< in these lower terranes, and 

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

 observed in the Utica shale. 



The jj^labella is broadly subovate, with a subanj^nilar frontal 

 lobe, truncate behind. Hanked by deep dorsal furrows, 

 moderately convex (apparently somewhat compressed as indi 

 cated by a lonj^ntudinal median fold); the basal lobes are 

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

 is, however, not known; no other o;labellar 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 suUicieut 

 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 Shumard's C. g i r a r d e a u- 

 e n 8 i 8, 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 li'ontal limb; the rim in the 

 Trenton form is only little upturned and rather Hat. but here 

 thick and sharply upturned. More extensive material may 

 necessitate uniting both the Trenton and Utica forms under 

 one specific name. With our inesent knowledge it would seem 



