390 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



crassus^, that closely resembles Anplcites hyatti, but the 

 Austrian species is more evolute, and has weaker knots or 

 spines. 



The septa are ceratitic, like those of A. whitneyi. 



While Anolcites hyatti was found associated with A. 

 whitneyi, it is much more primitive. The former species 

 is transitional from Ceratites, and the latter forms a con- 

 necting link with Pi'otrachyce^-as. 



Horizon and locality. Upper part of the Middle Trias, 

 Daonella beds, West Humboldt Range, Nevada, on the 

 divide between Troy Canyon, and the south fork of 

 American Canyon, about four miles south of Foltz Post 

 Office, associated with Anolcites -whitneyi, A. nieeki, Pro- 

 trachyceras americanum, Beyrichites rotelliformis, Acro- 

 chordiceras hyatti, Ccf'atites nevadanus, Ceratites vogdesi, 

 Sageceras gabhi, Celtites halli, Eutomoceras laubei, Daonella 

 duhia, and many other species characteristic of the upper 

 horizon of the Middle Trias. 



The specific name is given in honor of the late Professor 

 Alpheus Hyatt. 



Trachyceras (Anolcites) meeki Mojsisovics. 



Plate XLV, Figs. 3-4. 



1882. Trichyceras meeki, Mojsisovics, Cephal. Medit. Triasprovinz, p. 108. 

 1877. Trachyceras judicaric tun, Meek, U. S. Geol Expl. Fortieth Parallel, 



Vol. IV, p. 118, pi. xi, figs. I, I a (not Trachyceras judicaricum 



Mojsisovics). 



Form moderately evolute, robust, deeply embracing, but not deeply 

 indented by the inner volution. Whorl increasing rather rapidly in height. 

 Umbilicus wide and deep. Umbilical shoulders abrupt, flanks gently convex, 

 abdominal shoulders gently rounded. Venter narrow, with deep central 

 furrow. Surface ornamented with strong radial ribs and fine spiral rows of 

 knots. The ribs bundle in knots on the umbilical shoulder, curve gently 

 forward on the flanks, and cross the venter almost without interruption. 

 There are rows of knots on the umbilical shoulder, on the ridge bordering 

 the ventral furrow, and three rows on the flanks. The strongest knots are 

 on the ventral borders. The ribs do not bundle in threes as shown in the 

 rather diagrammatic drawing of the type published by Meek. There are 

 usually two ribs branching out from an umbilical tubercle, and the alternate 



iSee Bibliog. 10— Bd. LXIII, p. 259, pi. viii, figs, i and 2. 



