Smith.] ^4^ [Oct. 2, 



Schizodus icIieeUri Swallow, PI. xxii, Fig. 4. CypricarcUa (?) wheeleri 

 Swallow, Trans. St. Louis Acad. Sci., Vol. i, p. 96. Sehkodus 

 wlieeleri Swallow, F. B. Meek, Final Rept. U. 8. Geol. Survey 

 Nebraska, p. 209. 



This species is very common in the Coal Measures from Pennsylvania 

 to New Mexico, in both Upper and Lower Coal Measures. It has been 

 figured and described so often that nothing new can be added. Our 

 specimens agree best with those from Iowa, described by F. B. Meek, 

 Final Report of the IT. S. Geological Survey Nebraska, p. 209, PL x. 

 Fig. 1, c. 



Occurrence. — Several specimens, both right and left valves, were found 

 in the Lower Coal Measures of Conway county, 8 N., 17 W., section 33, 

 northeast quarter of northeast quarter, at Cook's stone quarry, near 

 Hattieville. This horizon is in the so-called Millstone Grit, and near 

 the middle of the Lower Coal Measures. All the fossils in these strata 

 are preserved in the form of casts. 



ScMzodus conf. amplus Meek and Worthen, Proc. Ac. Nat. Sci. Phil., 

 1870, p. 41 ; Geol. Surrey Illinois, Vol. v, p. 579, PL xxvii. Fig. 6. 



Tliis large Schizodus is found in the Coal Measures of Pennsylvania 

 and Illinois, and an imperfect specimen, probably belonging to the same 

 species, was found in the Lower Coal Measures of White county, 8 N., 

 7 W., section 33, east half of the southeast quarter, in ferruginous sand- 

 stone, on the road from Searcy to Griffin Springs. 



Genus Astartella, Hall. Astartella neioberryi Meek, Pal. Ohio, ii, p. 

 340, PI. xix. Fig. 1. 



This characteristic species is common in the Upper Coal Measures of 

 Poteau mountain, Indian Territorj', and in the Lower Coal Measures 

 of Conwa}" county, Arkansas, 8 N., 17 W., section 33, northeast quarter 

 of northeast quarter. 



Astartella vera Hall, Geol. Surrey Iowa, i. Part ii, p. 715, PI. xxix. Fig. 1. 



This species occurs in the Coal Measures of Iowa, Indiana, Illinois 

 and Pennsylvania, and was found in the upper division of the same 

 series on Poteau mountain, Indian Territory. 



Genus Pleurophorus, King. Plcnrophorus oblongusMeek, JJ. S. Geol. 

 Surv. Nebraska, p. 212, PI. x, Fig. 4. 



This was described by Meek from tlic Upper Coal Measures of 

 Nebraska, and was found in the Lower Coal Measures of Conwaj' 

 county, 5 N., 16 W. , section 17, centre of the north half. 



Pleurophorus. sp., C. A. White, BuU. 77 U. S. Geol. Surrey, p 27, PL iv, 

 Figs. 5-10. 



This Pleurophorus was described and figured 1)ut not named by Dr. 



