68 University Geological Survey of Kansas. 



All of our Kansas shells fall within two of these sections, the 

 second and the sixth. The Striatse include : : C. mesolobns, ver- 

 nuilianus, and granulifer. The Lirves include C. glaber Gein. 



Chonetes glaber. Plate IX, fig. 2. 



Chonetes glaber Geinitz, Carb. u. Dyas in Neb., p. 60, pi. iv, ff. 15-18, 

 (1866); Meek, Fin. Rep. U. S. Geol. Surv. Neb., p. 171, pi. xiv, f. 10, pi. 

 vin, ff. 8-8c. 



Chonetes geinitziana Waagen, Pal. Indica, ser. xin, vol. i, p. 261, (1884). 



Chonetes Icevis Keyes, Proc,. Acad. Nat. Sci. Phil., p. 229, pi. xn, f. 3: 

 Geol. Surv. Mo., v, p. 55, pi. xxxvn, f. 5, (1895). 



Chonetes gelnitzianus Miller, N. Amer. Geol. and Pal., p. 339, (1889). 



Chonetes glaber Schuchert, Bull. No. 87, U. S. Geol. Surv., p. 74, (1897). 



Meek's description : " Shell thin ; transversely subsemicir- 

 cular, length being more than half the breadth ; hinge line a 

 little longer than the greatest breadth of the valves, at any 

 point farther forward ; lateral extremities abruptly pointed and 

 sometimes slightly recurved ; anterior and anterior lateral mar- 

 gins, forming a semicircular curve in outline, excepting that 

 the former is generally faintly sinuous in the middle ; lateral 

 margins curving abruptly outwards just before intersecting the 

 hinge extremities. Pedicle or larger valve moderately convex, 

 the most gibbous part being in the form of two broad, rounded, 

 undefined prominences, which diverge from the beaks to the 

 anterior lateral regions, leaving a rather broad, rounded, deep 

 mesial sinus between them, extending nearly to the beak, but 

 widening and deepening rather rapidly to the front ; outside of 

 these prominences the posterior lateral regions are more or less 

 compressed; beak small, compressed, slightly arched, and 

 scarcely projecting beyond the cardinal margin ; area narrow, 

 inclined obliquely backward; its fissure small, nearly semi- 

 circular and partially closed by the cardinal process of the other 

 valve ; cardinal margin armed on each side of the beak by four 

 or five slender, moderately long, oblique spines, with sometimes 

 remains of one or two much smaller rudimentary additional 

 ones near the beak; cardinal teeth compressed, their longer 

 diameter ranging nearly parallel to the hinge line — as seen 

 under a strong lens, finely striated on the outside, at right 

 angles to their length. Interior, excepting the regions of the 



