336 CRUISE OF THE NEPTUNE 



(B) From a dark gray impure limestone resembling that of the 

 Black River and Trenton formations of southern Canada: 



CEPHALOPODA. 



1. Eurystomites undatus. Emmons. 



2. Plectoceras obscurum, Hyatt; or some closely related species. 



3. 4 and 5. Three species of Orthoceras, as yet undetermined. They 



are not well preserved and require better specimens before 

 they can be identified. These are probably of the age of the 

 Trenton of southern Canada. 



((7) From a slab of bituminous shale: 



1. Asaphus latimarginatus, Hall. I cannot distinguish this form 

 from the species usually designated in Canada as Asaphus 

 canadensis, Chapman, from the Utica shale. 



