138 NORTH AMERICAN INDEX FOSSILS. 



LXXVIIL Probeloceras Clarke. 



Less involute than preceding; suture of young manticoceran, 

 becoming sharply angular in adult. Devonic. 



204. P. lutheri Clarke. (Fig. 1389, c.) Devonic. 

 Very slightly involute ; septa crowded and nearly parallel ; median 



saddle acute, and two lateral lobes acute; surface with fine lines, 

 gently curving forward. 



Naples shales of New York. 



Aganidida. 



LXXIX. Parodiceras Hyatt. 



Goniatites similar to preceding, but more involute ; sides less flat- 

 tened, semilunar in section; lateral lobes and saddles rounded, 

 nearly equal ; ventral saddle deeply divided ; annular lobes some- 

 times present. Devonic. 



205. P. discoideum (Hall). (Fig. 139 1.) Devonic. 



Fig 1 39 1. Parodiceras discoideum. 



Completely involute; surface with striae of growth only. (Type 

 of genus.) 



Marcellus (Agoniatite limestone) and Hamilton of New York. 



LXXX. Aganides deMontfort. 

 (Brancoceras Hyatt, not Steinmann.) 

 Closely involute, with sides somewhat convex ; umbilicus minute 

 or closed, and without angular shoulders ; ventral lobe without 

 saddle, otherwise similar to Muensteroceras. Mississippic. 



