214 J?. S. Lull — Fossil Dolphin from California. 



Measurements of the skull. 



Deljili ina vus Delph in us 



Cat. No. 10040 Cat. No. 265 



Length, including rostrum 290"" n 44<) mm 



" anterior end of jugal to tip of rostrum 181 265 



Height, vertex to lower margin of exoccipitals 117 150 



Antero-posterior diameter of orbit 35 49 



Length of mandible _._ 27 S 370 



Height of mandible at posterior end 64 66*5 



Space for 10 alveoli in rear of maxillary 43 47 



Maximum length of crown of tooth 06 08 



Squamosal, height 40 41 -5 



" exposed breadth 36 21 



Tympanic bone, greatest diameter 30 



Height of mandible at mid-length 17'5 26'5 



Length of S3 r mphysis 32*4 37 



Vertical diameter of mandibular condyle 20-5 23 



Vertebral column. — Cervical vertebrae. The cervicals are 

 recorded only as deep impressions in the matrix, so that their 



Fig. 3. 



Fig. 3. Impressions of cervical vertebra?. 1% na t- s i ze - I> atlas ; fac, 

 posterior facet of atlas ; z, postzygapophysis of axis ; dl, ? first dorsal ; VII, 

 seventh cervical. 



interpretation is accompanied with great difficulty and the 

 apparent results may not be in harmony with the actual facts. 

 The vertebrae seem to be entirely free, the atlas presenting its 

 posterior aspect, with well-developed, slightly convex facets for 

 articulation with the axis, such as Delphinus might well exhibit 

 were the bones not coalesced in their lower half. The right 

 diapophysis is indicated. The axis seems to have been a rather 



