Vol. VII] WARING— STRATIGRAPHIC AND FAUNAL RELATIONS 65 



slender, rounded, longitudinal, radiating ribs ; on the other 

 side are three of these radial ribs, and starting from the mar- 

 gin are other ribs which make an angle of about 30 degrees 

 with the margin and curve inwards towards the midrib. 

 Locality 3. There seem to be no characteristic differences be- 

 tween Shumard's and Gabb's species, so they are placed under 

 the earlier species name. 



Trigonia evansana Meek 



PI. 8, Fig. 6 



T. cvansi Meek, Pal. Cal., vol. 1, p. 189, pi. 25, fig. 177. 



"Shell trigonal, produced behind; beaks anterior, subter- 

 minal, very prominent, strongly incurved; anterior end con- 

 vexly truncated, very broad laterally; basal margin prom- 

 inently rounded in the middle. Sloping upwards posteriorly 

 straight to the posterior end, which is narrow and round ; 

 cardinal margin concave, nearly straight behind. Corslet bor- 

 dered by a rounded double rib crossed by small transverse lines, 

 and marked on its surface by about eighteen small oblique ribs ; 

 remainder of the surface marked by about twenty large prom- 

 inent ribs, slightly radiating, but nearly parallel posteriorly." 



The posterior end of the figured specimen is broken off, as 

 is part of the corslet. Locality 2. L. S. J. U. Pal. Coll. 



Gastropoda 



Anchura, species ? 



This species resembles A. transversa Gabb,^^ in the follow- 

 ing characteristics: Shell large, fusiform, spire elevated; 

 whorls rounded, suture deep ; surface of whorls strongly can- 

 cellated by longitudinal and transverse ribs ; canal long and 

 straight. Locality 1. L. S. J. U. Pal. Coll. 



Amauropsis oviformis Gabb 



PI. 9, Fig. 9 



A. oviformis Gabb. Pal. Cal., vol. 1, p. 109, pi. 19, fig. 63. 



Shell ovoid ; spire rather elevated ; six rounded whorls ; 



suture slightly channelled ; aperture moderate, acute pos- 



^A. trans-, ersa Gabb, Pal. Cal., vol. 2, p. 165, pi. 27, fig. 45. 



