The Fauna of the Maxvillc Limestone. 383 



This species is characterized by its punctate structure, thick 

 shell, and obliquely truncated beak. 



Horicon and locality. — Maxville limestone. 

 Upper zone : Gladstone Mills, Thompson Residence, Below 



Thompson Residence, White Cottage. 

 Shale-nodular zone : Cut No. 5, Mouth of Hough Hollow, Mt. 



Perry-Fultonham ; Kroft Bridge, White Cottage; Stimmel 



Residence, Maxville ; Smith Chapel, Logan. 

 Lower zone: Cut No. 2, Cut No. 3, Cut No. 4?, Cut No. 5, Mt. 



Perry-Fultonham. 



Undetermined zone : Middle of Cut No. 6, Mt. Perry-Fulton- 

 ham. 



SEMINULA SUBQUADRATA-Hall. 



1858. Athyris subquadrata. Hall, Geol. Surv. Iowa, Vol. T, pt. II, p. 703; 

 pi. 27, figs. 2 a-d; p. 708, fig. 118. 

 Kaskaskia limestone : Chester, Illinois ; Crittenden County, Kenr^ 

 tucky. 



1877. Athyris subquadrata ? Hall and Whitfield, U. S. Geol Expl. 40 

 Par., Vol. IV, p. 271, pi. 5, figs. 19, 20. 

 Wasatch limestone : Utah. 

 1886. Athyris subquadrata. Heilprin, 2d Geol. Surv. Penn,, Ann. Rep. 

 for 1885, p. 453, p. 440, fig. 2. 

 Mill Creek limestone, Upper Coal Measures : Wilkesbarre, Penn- 

 sylvania. 

 1886. Athyris subquadrata. Heilprin, Proc. and Coll. Wyo. Hist, and 

 Geol. Soc, Vol II, pt. II, p. 269, fig. 2. 

 Mill Creek limestone, Upper Coal Measures : Wilkesbarre, Penn- 

 sylvania. 

 1891. Athyris subquadrata. Whitfield, Ann. N. Y. Acad. Sci., Vol. V, 

 p. 585, pi. 14, figs. 1-3. 

 Maxville limestone : Newtonville and Maxville, Ohio. 

 1894. Seiiiinula subquadrata. Hall and Clarke, Int. to Study of Brach., 

 pt. II, pi. 35, figs. 13, 15. 

 Chester limestone: Crittenden County, Kentucky. 

 St. Louis limestone : Pella, Iowa. 

 1894. Athyris subquadrata. Keyes, Mo. Geol. Surv., Vol. V, p. 92. 

 Kaskaskia limestone : Ste. Mary, Missouri. 

 3 



