STANTON.) CYPRINIDjE. 105 



Pueblo, Colorado. They differ from the type in that the beaks are not 

 quite so near the anterior end and the posterior end is more narrowly 

 rounded, but these differences are not regarded of specific importance. 

 This species may also be compared with Veniella humilis M. & H., 

 which is found at the top of the Montana formation. 



The hinge (of the left valve) is very much like that of V. conradi, the 

 type of the genus there being three strong, thick cardinal teeth and a 

 long posterior lateral tooth. 



Veniella goniopiiora Meek. 

 PI. xxiii, l£jg. 5. 



Veniella goniophora Meek, 1870, U. S. Geol. Sur. Terr., vol. IX, p. 152, Fig. 12 in text, 

 and PI. 4, Fig. 4. 



" Shell rather thin, short, subquadratcor subtrapezoidal, with length 

 only slightly greater than the height, becoming extremely gibbous with 

 age, the convexity of large specimens sometimes equaling the length; 

 dorsal outline more or less straightened, or, in large adult specimens, 

 curving downward somewhat posteriorly to the rather short, truncated, 

 posterior margin; basal margin generally rather deeply rounded in 

 outline anteriorly, and straightened or even slightly sinuous and ascend- 

 ing posteriorly, to the posterior basal extremity, which is distinctly 

 angular; anterior side narrowly rounded below, and deeply sinuous 

 under the beaks above; beaks prominent, very gibbous, obliquely and 

 strongly incurved, in young shells located near the anterior side, though 

 not quite as prominent as the margin below,imt in the adult sometimes 

 overhanging the anterior margin; lunule excavated, but apparently 

 not defined by a marginal ridge; posterior umbonal ridge very promi- 

 nent and strongly angular from the beaks to the posterior basal angle, 

 while the space between it and the dorsal margin is concave; surface 

 showing concentric stria 1 , and generally a few stronger ridges. 



" Length of the largest specimen seen, 1.60 inches; height of same, 

 1.38 inches; convexity, 1.55 inches. 



" Casts of this species show the posterior lateral teeth of the hinge 

 to present the usual characters of the genus; while in one specimen the 

 posterior cardinal tooth of the right valve can be seen to be stror»g and 

 deeply bifid. Another specimen shows the middle cardinal tooth of the 

 left valve to be strong, prominent, broadly trigonoid conical, and slightly 

 curved upward at the-end, as in the type-species, and the posterior car- 

 dinal to be narrow and arcuate; the oblique, trigonal pit for the middle 

 cardinal tooth of the other valve occupying the space between the two. 

 None of the specimens show the anterior cardinal tooth of either valve; 

 but enough of the hinge and other characters can be determined to re- 

 move all doubt in regard to its being a true typical Veniella and not a 

 Venilicardia. 



" Generally, the internal casts of this species retain no traces of the 



