197 



surface of volutions of spire bearing three, moderately prominent, 

 rounded, revolving carinas, with fine, elevated, revolving lines, in the 

 interspaces. In the specimen under examination, there are two of 

 these lines, between the upper and middle carinse, one between the 

 middle and inferior and two in the sutm-al channel. The last volu- 

 tion has four carinas, and the space between the upper two, is wider 

 than between the inferior ones, and bears two fine, revolving fines. 



Spiral angle, 16°; length, 1.50 inch ; width at base, 0.45. 



Occurs with the preceding species. 



Dedicated to Professor Winchell, State Geologist of Michigan. 



Genus Pleurotoma, Lamarck. 



P. Texana, (n. sp.) Shell small, elongate-conical, very slender, 

 tapering gradually to an acute point ; volutions fourteen to fifteen, 

 moderately convex ; last one flattened convex beneath ; suture deeply 

 channelled ; aperture subcircular, approaching subquadrate ; outer lip 

 thin, strongly sinuate ; umbificus closed ; surface of volutions marked 

 with numerous, unequal, moderately distinct, raised revolving lines, 

 of which three or four are more prominent than the others, also with 

 fine, very flexuous longitudinal lines of growth. 



Spiral angle variable, from 15° to 18° ; length, 0.58 inch, width, 0.16. 



This fine little species was found in considerable abundance at a 

 single locafity near Bed Kiver, Lamar County, in some Cretaceous 

 strata. It is associated with Cucullcea miliestriata and Scalaria La- 

 marensis. 



Genus Scalaria, Lamarck. 



S. (Scala) Lamarensis, (n. sp.) Shell small, turriculafe ; spire 

 elevated, and enlarging somewhat gradually to apex ; volutions five 

 or five and a half, rounded ; last one angulated and carinated below 

 and flattened beneath; suture deeply impressed; aperture nearly 

 circular, subtruncate below ; surface ornamented with very prominent, 

 strong, rounded, longitudinal folds, separated by specimens double 

 then- width. The under surface of the last volution is marked only 

 with very fine revolving and longitudinal strias, the folds not being 

 prolonged beyond the carina. The number of folds amounts to ten on 

 the inferior turns. 



Spiral angle, 33° ; length, 0.27 inch; width, 0.11. 



Occurs with the preceding species. Bluffs of Red River, Lamar 

 County. 



S. (Scala) BicARiNiFERA, (n. sp.) Shell small, turriculate ; spire 

 moderately elevated ; volutions six, strongly rounded, last one moder- 

 ately ventricose, rounded beneath ; suture deeply impressed ; aper- 

 ture circular or shghtly ovate ; lip thin, margin everted before ; sur- 

 face ornamented with prominent, longitudinal folds, more slender 



