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University of California Publications in Geology [Vol. 8 



Evidence of a high-crowned symphysial (?) row of teeth is af- 

 forded by specimens no. 20043 and no. 20045. Specimen no. 20043 

 is but 16 millimeters in length and is highly arched. Just posterior 

 to the middle of the tooth at the point of greatest convexity is 

 a dome-like prominence. The fine reticulations radiate from the 

 inner side of this prominence and are worn off on its crown. The 

 root is as deep as the greatest depth of the crown (fig. 25). A row 

 of minute holes is to be found encircling the root about a millimeter 

 above its base. The edge of the enamel is serrated at the overhanging 

 margin of the crown. Specimen no. 20045 is 23 millimeters in length, 



/ 



2b 



Fig. 1. Stroplwdus shasteusis, n. sp. Upper surface of tooth from an an- 

 terior (?) series. Type specimen no. 200-11. X 1%. 



Fig. 2a. Stroplwdus shasteusis, n. sp. Upper surface of high-crowned sym- 

 physial (?) tooth. No. 20043. X 1%. 



Fig. 2b. Stroplwdus shasteusis, n. sp. Lateral view of high-crowned sym- 

 physial (?) tooth. No. 20043. X 1%. 



7 in width, and 5y 2 and 6 respectively in width anteriorly and pos- 

 teriorly. The crown is more strongly convex than in any of the other 

 specimens. The reticulations on this tooth show little wear. The 

 enamel is over a millimeter in thickness. 



Two still smaller teeth (no. 20044; no. 20042). evidently from a 

 symphysial series, are narrower anteriorly and posteriorly, are not 



