284 APPENDIX. 



of two female specimens taken by Captain Scammon, off Point Arguello, California, will be found 

 in his monograph. Length, six feet and seven to nine inches. Dorsal falcate, immediately over 

 the navel. Front of head prominently bulbous or convex beyond the even curve of the back of 

 the head ; a slight convexity below, behind the vent. Beak slender, elongated. The following are 

 the dimensions of the cranium, in inches and decimals : 



Length of skull in straight line 18 .76 



Internal length of brain cavity 4 .40 



Length of beak anterior to maxillary notches 11 .90 



Length from tip of beak to anterior margin of superior nares 13 .40 



Length from tip of beak to posterior notch of palate in the median line 13 .90 



Length from tip of beak to posterior tooth 10 .50 



Height of skull at vertex 6 .00 



Greatest breadth at zygomatic process of squamosals 6 .95 



Breadth at supra - orbital ridge 6 .10 



Breadth between maxillary notches 3 .40 



Breadth at middle of beak 2 .00 



Breadth of the two premaxillaries at middle of beak .90 



Width of condyles 3 .70 



Closest approximation of condyles below the foramen .90 



Height of foramen magnum 1 .40 



"Width of foramen magnum 1 .60 



Entire length of ramus of lower jaw 15 .90 



Tip to posterior edge of last tooth 9 . 80 



Length of symphysis 2.10 



Height of ramus at eoronoid process 2 .75 



Width between outsides of articular surfaces 6 .10 



Width between posterior teeth 2 .10 



Length from tip to anterior notch of dental foramen 11 .40 



Length of largest teeth, sharply conical .56 



Greatest diameter of same .13 



Length from tip of beak to superior transverse ridge behind the frontals 15 .60 



Teeth in the specimen before me, |f by ff The anterior six on each side above are barely 

 indicated, and do not project above the gums; the next four on each side, though projecting, are 

 very small. Below, 47 teeth on each side are plainly visible, and there is room for foiu- or five 

 more between the most anterior tooth and the end of the symphysis. The teeth are very sharply 

 conical, rather wider transversely than in the direction of the ramus, and slightly incurved at the 

 tips. The number in the other specimen is reported to have been |-A on each side. 



The principal features of the cranium, as compared with the other species of the genus Del- 

 phinus as restricted by Gray (1871), are the great length of the beak as compared with the brain- 

 case, and the remarkably deep channels in the maxillary bones on each side of the palatal ridge, 

 which actually overlaps on each side to the extent of 0.2 of an inch. Six and a half inches 

 behind the end of the beak, a groove commences in the median line of the palate, which widens 

 anteriorly, exposing the premaxillaries near the end of the beak. Behind the point mentioned, 

 the palate rapidly rises as a narrow ridge (from 0.7 of an inch to one inch in width), evenly 

 rounded on the edges and slightly convex in the middle, contracting a little in width after' passing 

 the posterior end of the tooth line; its edges overiapping the lateral channels, and its inferior 

 face extending at its junction with the palatines to the distance of 1.2 inch below the superior 

 arch of the maxillaries. A groove extends posteriorly between the palatines and pterygoids, ter- 

 minating in a slight notch between the latter, which notch is a little posterior to the'' posterior 

 tei-mination of the narial septum. The pterygoid and tympanic bones are wanting in this specimen, 



