LOWEE CAKBONIFEKOUS FOSSILS. 561 



whole, small, finely plicate, and profusely punctate, but showing considera- 

 ble variation in size, shape, and plication. The largest specimen is 16 mm. 

 long and of the same width ; but it is badly crushed. Another example, 

 more nearly the average size, is 11.5 mm. long and the same in width; it 

 has about twenty-eight striae. A third specimen is 14 mm. long, 5.5 mm. 

 wide, and is ornamented with about thirty-eight striae. These data show 

 the range of variation among the specimens in the collection. 



I have not been able to verify the generic reference of this form by 

 the study of internal structure, but on external evidence it can not be 

 distinguished from the species to which I have referred it. 



It is probable that Terebratula marcyi Shumard belongs to this same 

 specific type, and if so, as it has priority of date over Eumetria verneuiliana 

 by four years, the name will have to be changed to E. marcyi. 



Formation and locality: Madison limestone, Limestone bluff north of 

 Little Sunlight Creek, Absaroka Range; Arnold Hague. East side of 

 Gallatin River, west of Electric Peak; amphitheater east of Bannock Peak, 

 Gallatin Range, bed 28; W. H. Weed. Crowfoot Ridge, Gallatin Range, 

 top of bed 25; J. P. Iddings and G. M. Wright. Same, top of bed 26, top 

 of bed 27, bed 28; J. P. Iddings and W. H. Weed. Slide east side of 

 Gallatin River, below Fan Creek. St. Louis and Chester horizons, Wash- 

 ington and Crawford counties, Arkansas; Floyd County and elsewhere in 

 Indiana; Alton, Illinois; Green County, Missouri; Iowa; Cumberland 

 Mountain, Tennessee. 



ATHYRIS McCoy, 1844. 



Athyris lamellosa LeveiHe - . 



PL LXXI, fig. la. 



Spirifer lamellosus Leveille, 1835: Mem. Soc. Geol. de France, 1st series, Vol. II, p. 39, 



figs. 21-23. 

 Athyris lamellosa Meek, 1875 : Pal. Ohio, Vol. II, p. 283, PI. XIV, fig. 6a, 6b. Hall aud 



Clarke, 1893: Pal. New York, Vol. VIII, Pt. II, p. 90, PI. XLVI, figs, lli-20. 



Herrick, 1888: Bull. Denison Univ., Vol. Ill, p. 49, PI. II, fig. 7. 



This species has been identified in the Yellowstone National Park from 

 one locality only, where, however, it can scarcely be considered rare. As 

 there exhibited, it more nearly resembles the form figured by Herrick from the 

 lower " Waverly" of Ohio (loc. cit, PI. II, fig. 7) than that of Meek (loc. cit. 



MON XXXII, PT II 36 



