Tlic Fauna of the Maxville Limestone. 409 



ovate, straight on the cohimella side ; outer Hp sharp ; inner lip> 

 thickened ; columella with distinct groove near the base of the 

 lip for the reception of the operculum ; surface marked by- 

 fine, elevated striae corresponding to the lines of growth. 



Fig. 31. — Strophostylus carleyana. A view of a partially exfoliated or 

 worn specimen, referred to this species. Enlarged four times. 



"Height, .10 to .30; diameter, .08 to .34 of an inch 

 [Hall, 1883]." 



Horizon and locality. — Maxville limestone. 

 Lower zone : Cut No. 4, Mt. Perry-Fultonham. 



MURCHISONIA VERMICULA— Hall. 



1856. Murchisonia vermicttla. Hall, Trans. Albany Inst., Vol. IV, p. 27. 

 St. Louis limestone : Spergen Hill and Bloomington, Indiana. 



1882. Murchisonia vermicula. Whitfield, Bull. Am. Mus. Nat. Hist., Vol. 



I, p. 87, pi. 9, fig. 11. 

 St. Louis group : Spergen Hill and Bloomington, Indiana. 



1883. Murchisonia vermicula. Hall, Ind. Geo!, and Nat. Hist., 12th Rep.,. 



p. 361, pi. 32, fig. 11. 



St. Louis group : Spergen Hill, Lanesville and Bloomington, In- 

 diana. 

 1906. Solenospira vennicula. Cumings, Ind. Dept. Geol. Nat. Res., 30th 

 Ann. Rep., p. 1357, pi. 26, fig. 11. 



Salem limestone: Spergen Hill, etc., Indiana. 



Description. — "Shell cylindrical, abruptly tapering at the 

 apex ; volutions from six to ten, moderately convex in the mid- 

 dle, and scarcely diminishing for the first four or five turns 

 above the base, but becoming more abruptly contracted above; 

 the surface of each volution marked by two very prominent 



