Geology of tlic St. Croix Dalles. — Berkey. 289 
vergent with broadly and uniformly rounded termination, strongly 
outlined; three pairs of lateral furrows inclining forward, anterior pair 
very faint, lateral pair prominent; occipital ring very prominent, the 
neck furrow passing laterally across fixed cheeks; fixed cheeks large, 
convex, continued as a margin to the glabella sloping into a deep 
transverse furrow separating it from a narrow cord-like marginal rim. 
Length of glabella 5 mm.; inner margin less than 2 mm.; marginal 
rim I mm. 
Agraulus hemisphericus, n. sji. 
Plate XX, Figs. 14 and 1."). 
Cephalic shield strongly and uniformly convex, in general (nitline 
resembling lllamts. Glabella very faintly outlined, elongate with 
slowly converging sides to a point two-thirds the distance to anter- 
ior margin where it is terminated by a faint groove parallel to the 
margin; surface of glabella smooth; occipital ring outlined indistinct- 
ly and continued across the fixed cheeks similarly; fixed cheeks large 
and conforming to the general convexity; frontal limb without groove 
and continues the curve of the glabella; eyes far removed a little pos- 
terior to the middle of the glabella from which the facial sutures pass 
anteriorly outward cutting the margin at right angles and posteriorly 
with a short lateral curve cutting the margin evidently within the genal 
angle. Length of head 15 mm.; width 21 mm.; length of giab:-lla 10 
mm. exclusive of occipital ring; anterior width 7 mm.; posterior 
width 9 mm. 
Formation and locality: Upper Dresbach, Taylor's Falls. 
Ptychoparia calymenoides (Whitfield). 
Conocephalitcs calyiiuiioiilcx Whitfield. Ann. Rept. Wis. Geol. Sur- 
vey for 1877, p. 52, 1878. 
Coitocephalites calymenoides Whitfield. Geol. Wis. vol. I\', p. 17c), 
1882. 
Plate XX, Fifrs. 3 and 4. Plate XXI. Fig. 4. 
A specimen agreeing' accurately with that described by Whitfield 
has been obtained. Unfortunately the head is not preserved, and the 
same difficulty as WHiitiield encountered is in the way of more accurate 
description. 
Formation and locality: Dresbach, Taylor's Falls. 
Genus Cheilocephalus, new genus. 
Etymolog'v : rkeilos, a lip or rim, and cephale, head. 
Description. Cephalic shield semicircular, strongly convex, about 
equ:d to one-fourth part of a spheroid; anterior (frontal limb) formed 
by a narrow ring projecting at a right angle beyond the general sur- 
face of the shield; glabella broad, convex, anteriorly slightly con- 
vergent and reaching to the narrow marginal rim, surface nearly 
smooth, with 2 pairs of scarcely perceptible furrows, marginal grooves 
not strongly marked; faint occipital ring (neck ring) but more strong- 
ly marked on the cheeks; fixed cheeks broad and conforming to the 
general spherical outline; the posterior margin developed into a spine 
