FORMATIONS OF ORDOVICIAN AGE. 47 
16. 
Le 
key 
Bumastus trentonensis (Kmim.). 
Pterygometopus callicephalus (Hall). 
Leperditia fabulites (Con.). 
The strata which have afforded the species recorded in the above 
list are undoubtedly the higher Black River and the lower Trenton 
beds, all of the species identified, except such as occur throughout 
the ‘Trenton limestone, being characteristic of this horizon. 
Locality 153 B.—This locality lies one mile southwest of the last, 
on the same line of outcrop,* and has furnished the following species, 
the horizon represented being the same as the last: 
hs 
10. 
ole 
12. 
iN}. 
Receptaculites occidentalis Salter. 
Streptelasma cornculum Hall. 
Romingeria? trentonensis n. sp. 
Actinostroma trentonensis 1. sp. 
. Prasopora simulatria Ulr. 
Lingula sp. wncdet. 
. Plectambonites sericeus (Sow.). 
Dalmanella testudinaria (Dal.). 
Dalmanella subequata (Con.). 
Rhynchotrema mequvalvis (Castel.). 
Hormotoma salteri Ul. 
Bumastus trentonensis (Hmm.). 
Leperditia fabulites (Con.). 
Locality 192 A—This locality is near Hainesburg, on the hill just 
east of the station,t and from it the following species have been 
identified : 
— 
Receptaculites occidentalis Salter. 
Streptelasma cornculum Hall. 
Romingeria? trentonensis n. sp. 
Rafinesquina alternata (Emm.). 
Dinorthis pectinella (Kmm.). 
Dalmanella subequata (Con.). 
Camarella inornata n. sp. 
Rhynchotrema inequivalvis (Castel. ) 
Cyrtodonta canadensis Bill. ? 
Hormotoma salteri Ulr. 
Bumastus trentonensis (Emm.). 
Leperditia fabulites (Con.). 
* Locality C, Map No. 10, p. 60, loc. cit. 
+ Locality 7, Map No. 12, p. 64, loe. cit. 
