PALiEONTOLOGICAL REPORT OF GEOLOGICAL SURVEY. 567 



Position and locality. Rare, in a dark bituminous soft stratum of 

 pyritiferous carbonate of lime; about one foot above the black shale 

 forming the roof of the Bonharbour coal, No. 11, Daviess county, 

 Kentucky. 



CHIMNITZIA PAEVA. Cox. 

 (PI. VIII, fig. 3, enlarged; 3a natural size.) 



Small; acute; volutions about six ; very ventricose; marked with 

 strong transverse ribs, slightly curved in the direction of the spire, 

 and separated by a deep furrow as wide as the ribs ; body whorl occu- 

 pies about one third the entire length of the shell; columella lip 

 slightly prolonged; mouth subcircular; length .^% inch; width 

 • T | o inch. 



Position and locality. Occurs in the dark bituminous, pyritiferous, 

 calcareous stratum over the shale roof of Bonharbour coal, No. 11, 

 Daviess county, Kentucky. 



PLEUROTOMARIA BONHARBORENSIS. Cox. 

 (PI. VIII, fig. 4, enlarged; 4a natural size.) 



Small; conical; a little longer than wide; volutions six; acutely 

 convex; marked with a well defined concave band; distinct on all the 

 whorls, and crossed with fine striee; convex in the direction of the 

 spire; ten to twelve spiral lines on the under part of the last whorl, 

 diminishing to two or three on the preceding whorls; crossed by fine 

 transverse striae, rather strongly curved with the convexity in the di- 

 rection of the mouth, giving a beautiful reticulation on the under part 

 of the last whorl, and ornamenting the preceding whorls, on the upper 

 part, with two to three spiral rows of small tubercles; spiral angle 

 about 75°; length .^V inch; width .-^V mc h- 



It differs from the P. Grayvillensis, Norwood and Pratten, Jour. 

 Acad. Nat. Sci., June, 1855, pi. ix., fig. 7, by its ornaments, and in 

 being more acute. 



Position and locality. Abundant, in the roof shales of the Bon- 

 harbour coal No. 11, Daviess county, Kentucky. 



ARCA CARBONARIA. Cox. 

 (PI. VII, fig. 5, natural size.) 



Transversly elongated; beaks not elevated; anterior extremity 

 short; obtusely rounded; tumid at the umbo, from which a slight ob- 



