Geol.— Vol. L] SMITH-COMPARATIVE STRATIGRAPHY. 2)11 



follows a small auxiliary saddle, followed by a short row of denticulations on 

 the umbilical shoulder. The internal septa consist of a moderately long anti- 

 siphonal lobe and a single lateral. 



Horizon and locality. Lower Trias, Aspen Mountains, 

 southeastern Idaho, Meekoceras beds, five miles west of 

 John Gray's Lake, and fifteen miles a little west of south 

 from that lake, also in Wood Canyon, nine miles east of Soda 

 Springs, at the latter locality associated with Meekoceras 

 gracilitatis, M. aplanaUi?n, Ussuria, Aspidites, Pseudosa- 

 geceras, Ophiceras, J^letningites, Danubites, Nannites, 

 Hedenstrcemia, and many other forms. The writer also 

 found it to be abundant in Union Canyon, near the Union 

 Spring, Inyo Range, fifteen miles southeast of Indepen- 

 dence, Inyo County, California, associated with practically 

 the same fauna as in Idaho. 



All specimens figured in this paper were collected by the 

 writer in Wood Canyon, nine miles east of Soda Springs, 

 Aspen Mountains, southeastern Idaho. 



Genus Flemingites Waagen. 



1892. Flemingites, Waagen, Records Geol. Sur. India, Vol. XXV, Part IV, 

 p. 184. 



1892. Flemingites, Waagen, Jahrb. k. k. geol. Reichsanstalt Wien, Vol. 

 42, Part 2, p. 380. 



1895. Flemingites, Waagen, Salt Range Fossils, Vol. II, Fossils from the 

 Ceratite Formation, p. 185. 



1897. Flemingites, Diener, Himalayan Fossils, Vol. II, Part I, Cephalo- 

 poda of the Lower Trias, p. 90. 



1902. Flemingites, Freeh, Lethsea Palaeozoica, Bd. II, Lieferung 4, p. 638. 



1902. Flemingites, Freeh, Centralblatt, fiir Min. Geol. und Pal., 1902, 

 No. 5, Ueber Trias-Ammoniten aus Kaschmir, p. 134. 

 Type ^' Ceratites'' flemingianus de Koninck, Quart. Jour. Geol. Soc. 



Lond, Vol. XIX, p. 10, pi. vii, fig. i, from the Lower Trias of the Salt 



Range of India. 

 Form evolute, little embracing; wide shallow umbilicus; whorls robust, 



usually a little higher than wide, increasing very slowly in size; sides rounded, 



venter somewhat flattened and usually much narrower than the greatest 



breadth of the whorl. Strong lateral folds are often present, but these are 



never dichotomous, and never cross the venter. There are strong fine spiral 



ridges on all parts of the shell, and these usually appear also on the cast. 



Body-chamber short, not greatly exceeding one-half a revolution. Septa 



distinctly ceratitic, like those of Meekoceras, but usually with longer lobes. 



There are four lobes, the external, first and second laterals, and the auxiliary. 



