166 KANSAS UNIVERSITY SCIENCE BULLETIN. 



TREPOSPIRA HAWORTHI, n. sp. 



Plate VIII, figures 3-36. 



Shell small, spire turreted, whorls enlarging rapidly, keeled, 

 and sharply angular. The upper part of the whorls are ob- 

 liquely flattened for a short distance to the edge of the keel 

 where they bend abruptly downward and round off below. 

 There is somewhat of a callosity in the region of the umbili- 

 cus. There are about four whorls in the adult shell. The 

 surface is ornamented with about eighteen fine revolving 

 striae, five of which appear above the carina and about thir- 

 teen below it. Near the umbilicus these lines are quite fine. 

 About two or three of the lines below the carina are visible 

 on the upper whorls of the shell. The suture is very dis- 

 tinct. Some Texas specimens show fine, elevated, crowded, 

 transverse stri;x\ The height of a complete specimen would 

 be about 3 mm. ; width, 2i mm. ; height of lower whorl, 

 2 mm. 



Whitehorse spring, Oklahoma; common. Dozier, Tex.; 

 common. 



This species is related to P. humerofia Meek, but the much 

 smaller size (^) and greater number of revolving striae will 

 at once distinguish them. Judging from our casts the shoul- 

 ders of the Red Beds specimens must have been quite as 

 prominent as those on the Pennsylvanian species just men- 

 tioned. It also resembles Trepmipira di.ves-ov.ralica Jakowlew, 

 from Russia, but has a much higher spire and is a very much 

 smaller species. 



MURCHISONIA COLLINGSWORTHENSIS, n. sp. 



Plate VIII, figures 7, la. 



Shell of moderate size, acute; suture impressed; whorls 

 enlarging very gradually ; keeled ; umbilicated below. The 

 whorls are beveled slightly outward from the suture, thence 

 falling nearly downward with a slight concavity (shown in 

 the best squeezes) , producing a low, undefined ring, scarcely 

 perceptible, just below the suture. A little over half the 

 distance to the suture below is a prominent, rounded keel. 

 The lower side of 'this keel is somewhat concave nearly to 

 the suture below, where about half the ridge below the keel 

 shows above the suture. On the body volution the keel is 



