ISOTELUS, ACROLICHAS, CALYMENE, AND ENCRINURUS 75 
quadrangular, but posteriorly the dorsal furrows diverge widely. 
Along the anterior margin of the cranidium, the border equals 
almost a third of the length of the glabella. Cranidia having 
the same structure occur in the Rogers Gap member of the 
Cynthiana formation, from Rogers Gap northward as far as 
Sadieville, Kentucky. 
A similar cranidium (plate XVIII, fig. 5 A, B) was found also 
in the quarry east of Carnestown, on the Kentucky side of the 
Ohio river. Here it occurred, associated with a single speci- 
ment of Orthorhynchula linneyi, about 10 feet above the railroad, 
and 56 feet below the base of the Fulton member, the latter 
containing Triarthrus hecki. Forty- two feet below the level of 
the railroad occur numerous specimens of Dalmanella hassleri, 
Hallopora multitahulata, and occasional specimens of Stropho- 
mena vicina, indicating the presence of typical Trenton strata, 
such as occur in central Kentucky. Associated with the cra- 
nidium mentioned above, occurred a single pygidium, with five 
pairs of ribs, all of which, excepting those belonging to the last 
pair, have the distal halves bifurcated by median grooves, as in 
typical Calymena senaria. 
Calymene sp. (Lorraine form) 
Plate XVIII, fig, fi 
At the Don Valley brick yards in the northeastern part of 
Toronto, in Canada, strata occur which are referred to the lower 
part of the Lorraine formation chiefly on account of the presence 
of Trinucleus concentricus, Leptaena invenusta, and Catazyga 
headi, all three associated in the same slabs. Among other 
species occurring in these slabs are the following: Climacograptus 
(Mesograptus) putillus, locrinus suhcrassus, Plectambonites seri- 
ceus, Dalmanella sp., Zygospira modesta, PhoUdops suhtruncata, 
Pterinea demissa, Byssonychia radiata, Lyrodesma poststriatum, 
Modiolopsis cf. concentrica, Modiolopsis modiolaris, Cyrtolites 
ornatus, Lophospira howdeni, Lophospira tropidophora, Sinuites 
cancellatus, and a species of Arthraria 3 inches long. 
With these fossils occurs a species of Calymene (Plate XVIII, 
fig. 1) which resembles Calymene abhreviata in the shortness of 
