NAPLES FAUNA IN WESTERN NEW YORK, PART 2 38 1 



and the suture is essentially equivalent in degree of lobation to Beloceras 

 i y n x, but, instead of the lobes and saddles all being narrow and angled, 

 the lobes in Timanitesacutus (type) are acute, the saddles broadly 

 rounded; in T. stuckenbergi both lobes and saddles are rounded. 

 Shells of this strange type seem to indicate a progression from Gephyro- 

 ceras both external and internal. Close enrolment in this group is one of 

 the indexes of progress, multisection of the suture another ; the latter being 

 the manifestation of such progress which, as just noted, has alone affected 

 the migrants of Gephyroceras. 



Prolecanites. As with the Naples fauna, the genus is represented by 

 only a single and rare species. Prole c. timanicus has a less divided 

 suture than Sandbergeroceras or Prole c. chemungensis, that 

 is the former has an embryonal aspect with reference to the latter, but 

 both are further exemplifications of the presence of inceptive forms of 

 this genus in the Intumescens stage. 



Tornoceras. The Domanik carries two species of this genus, T. sim- 

 plex v. Buch, which is in effect T. uniangularisof the Naples fauna, 

 and T. c i n c t u m Keyserling, which is identical with T. bicostatum 

 Hall. The last named in the writer's illustrations presents the edges of the 

 broad hyponomic ridge apparently nearer to the back of the whorl but 

 specimens are not infrequent which show all the characters afforded by 

 T. c i n ct u m. 



Bactrites. Holzapfel redescribes B. subflexuosus Keyserling, 

 which attains large size and bears an apparently smooth exterior and elliptic 

 cross section, and also an undetermined species with characteristic oblique 

 surface lines. We have already noted the presence in the Angola shales of 

 a species very similar to the former, specified as B. cf. subflexuosus. 



As for the other cephalopods of the Domanik, we find excellent equiv- 

 alents in the New York fauna. Gomphoceras uchtense, cf. 

 G. atreus, Phragmoceras [or Gomphoceras] timanicum, 

 cf. a smaller species not described in the Chautauquan subprovince, O rtho- 

 ceras sp., a smooth longicone like O. pacator, Orthoceras sp., a 



