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University of California Publications. [Geology 



resembles the ichthyosaurian type in the moderately large orbits 

 and in the position of the superior nares. 



The portion of the lower jaw present (fig. 2) shows almost 

 the same vertical diameter for its entire length, and tends to 

 be somewhat narrower vertically below the orbit than in most 



Fig. 3. — Phalarodon fraasi. Superior aspect of skull. No. 9853, nat- 

 ural size. F, frontal; Pf, prefrontal; L, lachrymal; N, nasal; M, maxillary. 



of the typical ichthyosaurs. Portions of the dentary, suran- 

 gular, splenial, and probably the angular elements are repre- 

 sented. A portion of the dentary is broken away on each side 

 of the skull, but the posterior end seems originally to have ex- 

 tended back about to the middle of the orbit. The alveolar 

 margin of the dentary is wide, the teeth being set a consider- 

 able distance in from the outer margin. The surangular extends 

 forward to the anterior end of this specimen, and reaches a 

 point anterior to the superior nares. The heavy splenials ex- 



