LOWER CARBONIFEROUS FOSSILS. 551 



Spirifer marionensis Shumard (!) 



Spirifer marionensis Shumard, 1855: Geol. Rept. Missouri, p. 203, PL 0, figs. 8a-8c. 



Hall, 185S : Geol. Surv. Iowa, Vol. I, Pt. II, p. 501, PL VI, figs, lff-lc. Hall 



and Clarke, 1893 : Pal. New York, Vol. VIII, Pt. II, PL XXXI, fig. 15. 

 Spirifera marionensis Wiuchell (A.), 1870: Proc. Am. Phil. Soc, Vol. XI, p. 252. 



Hall, 1883: Second Ann. Rept. Xew York State Geologist, PL LVI, fig. 15. 



Herrick, 1888: Bull. Denison University, Vol. Ill, p. 43, PL VI, figs. 2-4; PL 



VII, fig. 11; Vol. IV, p. 26, PL II, tig. 2. 



This form is found only at the head of Conant Creek, Teton Rang-e. 

 The material, which is much crushed and broken, so far as ascertained, can 

 well be referred to Shumard's species. It is much larger and more coarsely 

 plicate than S. centronatus, and much resembles S. striatus of this report, 

 except that the surface is crossed by numerous lamellose concentric striae, 

 whereas the other is smooth. A satisfactory identification is rendered 

 impossible by the character of the material. 



Formation and locality: Madison limestone, head of Conant Creek, 

 Teton Range; W. H. Weed. White Mountain, Absaroka Range, just below 

 Quadrant quartzite ; T. A. Jaggar. Chouteau age, Louisiana and Hannibal, 

 Missouri; Portsmouth and Sciotoville, Ohio. 



Spirifer striatus var. -madisonensis n. var. 

 PL LXX, figs. 2a, 2b, 2c, 2d. 



This form in general appearance resembles S. striatus Martin, of the 

 Mountain limestone of various European localities. It does not attain 

 so large a size as is often seen among- specimens of S. striatus, and the 

 strise are coarser and less numerous than in some of the forms figured by 

 Davidson. 



The material under discussion approaches most closely to certain 

 specimens from Cork, Ireland, with which it has been compared, but 

 certain differences obtain which are worthy of at least varietal distinction. 

 The area in S. striatus var. madisonensis is higher, even in specimens of 

 considerably smaller size; the ventral beak more overhanging, and the 

 foramen higher in proportion to its width. The outline shape of both 

 types is nearly the same, likewise the number and size of the striae. The 

 fold is somewhat higher in the Irish form, and considerably more angular. 

 The stria? bifurcate in the immediate vicinity of the beak, and often again 



