Geol.— Vol. I.] SMITH— COMPARATIVE STRATIGRAPHY. 399 



Squaw Creek and Pitt River, about six miles northeast of 

 the Bully Hill Mine. In the Tyrolian Alps it occurs in 

 the same horizon, and with the same fauna. 



Genus Sagenites Mojsisovics. 



1879. Sagenites Mojsisovics, Vorlaufige kurze Uebersicht der Ammoniten 



Gattungen, etc., p. 141. 

 1893. Sagejiiies Mojsisovics, Cephalopoden der Hallstatter Kalke, Bd. II, 



P- 155- 

 1896. Sage?iites Mojsisovics, Beitr. Kennt. Obertriadischen Cephalopoden- 

 Faunen des Himalaya, p. 608. 

 Type, Ammonites reticulatiis Hauer. 



Subglobose, somewhat compressed laterally, sides rounded, venter highly 

 arched. No abdominal shoulders. Whorls involute, deeply embracing, 

 increasing rapidly in height. Umbilicus narrow, but open and deep. Body- 

 chamber long. Sculpture consisting of dichotomous folds or ribs, which cross 

 the venter, but become weak on that part of the shell. In addition to these 

 folds there may be spiral lines or ridges; and in one group there occur short 

 spines arranged in spiral rows on the ribs. 



The septa are ammonitic, complex, and deeply digitate. 



Mojsisovics divides Sagenites into three groups: i. Sa- 

 genites inermes, 2. Sagenites reticulati, and 3. Sagenites 

 s-pinosi. The last group he designates as the subgenus 

 Tr achy sagenites, with Sagenites erinaceus Dittmar as the 

 type. 



The Sagenites inermes and Trachysagenites appeared in 

 the Karnic horizon of the Upper Trias, the latter becoming 

 extinct at the end of this stage, and the former living on 

 into the Noric stage, in which the Sagenites reticulati 

 appeared for the first time. The genus Sagenites s. str. is 

 not known in America, but it is represented by two species 

 of the subgenus Trachysagenites , S. erinaceus Dittmar and 

 S. herbichi Mojsisovics. 



Sagenites (Trachysagenites) herbichi Mojsisovics. 



Plate XLVI, Figs. 7-8; Plate XLVII, Figs. 5-6. 



1893. Sagenites ( Trachysagenites) herbichi, Mojsisovics, Cephalopoden der 



Hallstatter Kalke, II, p. 180, pi. ci, fig. 3; pi. cii, figs. 1-6. 



Form subglobose, somewhat compressed laterally, robust, involute. Whorl 



highly arched, high, helmet-shaped, deeply embracing, increasing rapidly 



in height, and not deeply indented by the inner volutions. Sides convex, 



