FAUNA OF THE TRENTON GROUP. 
35 
of which rise five large spines, all broken off at the base on this speci- 
men. Along the top of the glabella is a row of pairs of sharply conical 
pustules. The fixed cheek is wide and does not extend far forward, 
the eye situated on a small mound (but broken away) and rather far 
back for this genus. Genal angle apparently rounded, though it may 
hlave borne a spine. 
Length about 6 mm., width about 20 mm. 
This species is exceedingly like Cybele coronata Schmidt, from 
the Kuckers of Esthonia, Russia. 1 Otherwise, it might be mistaken 
for an Encrinurus. The five stout spines at the frontal margin are, 
of course, the striking feature. It is hoped that better specimens 
will fall to the lot of some collector. Ail of the other so-called 
Oybeles in America have a peculiar tripartite glabella instead of a 
normal one with lateral furrows. All the American forms have, there- 
fore, been transferred to Oybeloides, a genus erected for them by 
Slocum. The present species agrees in glabellar structure with many 
of the European forms referred to Cybele, though not strictly in 
accord with the genotype, C. bellulata. 
Horizon and Locality. The specimen is from the lower part of 
the Collingwood limestone at Craigleith, Ont., and was collected by 
E. J. Whittaker. 
Genus, Ceraurus Green. 
Ceraurus dentatus Raymond and Barton. 
Plates X, XI, figures 7, 8. 
Ceraurus dentatus Raymond and Barton, Bull. Hus. Comp. Zool., 
54, No. '20, 1913, p. 534, PL 1, fig. 1, PI. 2, figs, 4, 5. 
Ceraurus pleurexanthemus Hall (partim), Pal. N.Y, 1847, 1, PL 65, 
figs. Id, lh, li, lm; Pl. 66, figs, la-lg. Emmons, GeoL Sec. Dist. 
New York, 1842, p. 390, fig. 6; Am. GeoL 1855, 1, Pl. 15, 
figs, la. If, lh, li, lk. Billings, GeoL Can., 1863, p. 188, fig. 188. 
Cumings, 32d Ann. Rept. Indiana State Geol. Surv., 1908, 
Pl. 54, figs. 9-9b (after Hall). 
The larger specimens figured by Hall diffe? from the typical 
form of Ceraurus pleurexanthemus in having the eyes much farther 
back and without eye-lines, in the possession of much longer and 
less divergent genal spines, and in having two pairs of well-developed 
spines on the pygidium, within the great spines. 
i Mem. de ITmp. Acad. d. Sc., Ser. 7, 3i0, No. 1, 118&1, p. 213, Pl. 13, figs. 
24-27 ; Pl. 14, fig 1 . (5 ; Pl. 15, fig. 10. 
