358 A, Winchell on supposed New Cephalopods. 
This impression agrees in form, dimensions and distance of 
rings with O. dactyliophorum de Kon, (An. Foss., pl. xvii, 
But this species is described as having circular strise without any 
longitudinal ones. It differs from O. tenuilineatum Sandberger 
(Verstein., Taf. xix, 7) by the greater approximation of the rings, 
and much more closely striated surface. This species, however, 
from the “ Orthocerasschiefer” of Wissenbach, seems at least to 
be a close analogue. Our fossil is perhaps identical with 0. an- 
nulatum of Hisinger, but I have no access to a description of 
that species. . 
Navuritus (TREMATODISCUS) PLANIDORSALIS, 0. sp. 
(non J, planidorsatus Portlock.) 
the surface bends abruptly down the dorso-lateral area, making 
htly rounded angle of 125°. The dorso- ~ 
