164 KANSAS UNIVERSITY SCIENCE BULLETIN. 



formis Jakowlew, but' differs in having more ventricose and 

 less angular whorls, sometimes three lines on the spire above 

 the carina and a smaller apical angle. It is strikingly simi- 

 lar to Turbo helicinus ( Schlotheim ) , from the British Per- 

 mian. Inasmuch as the presence of the slit has not been 

 determined with certainty in the specimen at hand, it is pos- 

 sible that they are very closel}^ related. 



PLEUROTOMARIA AGNOSTICA, n. sp. 



Plate VIII, figures 13«, b. 



Shell small, spire elevated, whorls five or six, suture dis- 

 tinct, slit high and rather deep, placed on the upper angle of 

 .the whorl, umbilicus open and small. The upper surface of 

 the whorls is somewhat convex in the casts. The edge of 

 this flattened region is quite obtusely angular, below which 

 the shell is rounded to the lower third of the whorl, where 

 it curves sharply into the base. Shell ornamented by several 

 revolving striae on the upper two-thirds of the whorl. The 

 casts show no marks on the lower third of the body whorl. 

 The shell is thick at the keel, and on the upper whorls about 

 four strong revolving lines may be distinguished in the edge 

 of one mold. There are faint indications on the cast of one or 

 two broad lines above the keel. No transverse markings are 

 shown on the specimens before me. Height of spire about 

 7 mm. ; of body whorl, 2i mm. ; diameter of body whorl, 4i 



mm. 



Whitehorse spring, Oklahoma; rare to common. 



This species is related to P. humerosus Meek, but is a more 

 slender species with a stronger keel. It would also seem to 

 be related to P. proutana Shumard, but the carination is above 

 the middle. It differs from P. peroraata Shumard in not 

 having strong transverse markings. 



WORTHENOPSIS? DEPRESS A, n. sp. 



Plate VIII, figures 4, 4a. 



Pleurotomaria sp. Beede, Inv. Pal. Red Beds, p. 7, pi. I, figs. 13, 136, 1902. 



Shell of moderate size, spire quite depressed. There are 

 three of four vertically compressed whorls. The body whorl 

 expands rapidly, nearly flat on top, the outer edge keeled and 

 angular, the angle being somewhat larger than a right angle ; 



