New Species of Devonian Fossils. 145 



Occurrence: Rockhouse shale, at Rockhouse, on Horse Creek, 

 Hardin County. 



Distemnostoma curtum, n. sp. 

 Plate I\', figs. 10-12 



Description: Shell small, consisting" of two and a half or three 

 rapidly expanding whorls ; spire depressed, the inner volutions 

 rising only a little above the outer one. Suture deep. Whorls 

 subovate in cross-section, almost twice as high as wade, the great- 

 est width being about one-fourth the distance below the top. 

 Aperture ovate, with a broad notch and short slit at the top, and 

 deeply channeled at the bottom. Inner lip entire, straight, and 

 thin. Base with a moderately narrow^ umbilicus. 



Slit-band of medium width, situated upon the outer half of 

 the rounded upper side of the whorl. Its inner margin follows 

 the central and highest line of the whorl, and its outer one is 

 about the center of the rounded shoulder but well above the 

 ambitus. 



Surface marked by fine, uneven lines of growth that curve 

 strongly backward from the suture to the band, and on the out- 

 side of the band first run strongly forward and then descend over 

 the outer side with a gentle curve to near the base, where they 

 arch strongly backward and then forvyard again oil entering the 

 umbilicus, thus conforming to the deeply channeled margin of 

 the aperture. 



Dimensions: Height, 14 mm. ; width, 16 mm.; height of aper- 

 ture, 12 mm. 



Occnrrencc: Rockhouse shale, at Rockhouse, on Horse Creek, 

 Hardin County. 



( ?) FAMILY STROPHOSTYLIDiE 



Aulopea, n. gen. 

 Diagnosis: Shell low-spired, of few gradually but rapidly 

 expanding whorls that are laterally compressed and much higher 

 than wide. Aperture elliptical, nearly vertical, deeply channeled 

 at the base. Inner lip thin and somewhat wrinkled, bounding 

 a deep, narrow umbilicus. Surface marked by lines of growth 

 only. 



