CATALOGUE OF THE CETACEA. 293 
not distinctly bifurcated. The lower transverse processes in the axis, instead of heing obsolete, as 
in D. Bairdii, are here produced into sharp points. A median triangular area on the lower surface 
of the centrum (wanting in D. Bairdii) is here very prominent, and continued backward by a 
strong, deep keel. In the posterior vertebra, all except the third are provided with a more or 
less evident spinous process, while in D. Bairdii none except the seventh shows any spine. In 
the present species the cervicals behind the axis are more nearly equal in size than in the former, 
and the upper and lower transverse processes are more strongly developed. In the third, fourth, 
and fifth cervicals in the median line, below and in front of the base of the neural spine, projects 
a small triangular prolongation of the bone, connected with the axis in the third, and with the 
preceding vertebra; in the fourth and fifth, by a small but unmistakable articular surface or facet. 
The pedicels of the neural canal are more arched laterally than in D. Bairdii, giving the passage 
a more flattened appearance than in that species. The following measurements will facilitate a 
comparison : 
Coossified atlas and axis, extreme width, 6.0 inches ; from the middle of the lower anterior 
edge to the posterior point of the spine, 4.1 inches. Height of neural arch, 1.0 inch; width, 1.5 
inch. Extreme width of condylar facets, 3.G inches. Third vertebra: width of centrum, 1.58 inch; 
of neural arch, 1.15 inch; height of centrum, 1.42 inch; of arch, 0.8 inch. Extreme width of 
vertebra between the points of the transverse i>rocesses, 2.25 inches. Length of that part of the 
vertebral column consisting of the five posterior cervicals, 1.6 inch. Atlas and axis, 1.35 inch 
more. The neural spine of the seventh cervical is 0.93 inch, and the extreme width between the 
points of the transverse processes is 3.75 inches. The spinous processes of the fourth, fifth, and 
sixth cervicals average about 0.3 inch in length. The bead of the first rib articulates with the 
body of the seventh cervical, as in D. Bairdii. 
The animal is rather thick in proportion to its length ; black above, with a Btrongly falcate 
dorsal. Below, white, to the edge of the patch passing from the lower lip below the pectorals 
and terminating a short distance behind the vent. A broad gray smouch on each side above the 
line of the black color, and interrupted about the middle of the animal on each side ; the edges 
of the gray are ill defined. The posterior edges of the pectorals and dorsal are also grayish. 
Length of animal, 7 feet and 3 inches; breadth of flukes, 2 feet; tip of snout to anterior edge of 
dorsal, 3 feet. 
Full descriptions of the colors and full measurements are given by Captain Scammon in the 
preceding monograph. A complete skeleton and the additional skull above described were obtained 
from two female specimens taken at Monterey, November 20th, 1872; besides which, one other 
skull is in Captain Scammon's possession, and one in the collection of the California Academy of 
Sciences. * 
Lagenorhynchus albirostratus ? 
Delphinus albirostratus? Peale, U. S. Ex. Exp. 1848; pi. 6, fig. 2. 
D. ceruleo-albm (Mayen) Cassin, 1. c, p. 31, pi. vi, fig. 2. 
Pacific Ocean, latitude 2° south, longitude 174° west. Peale. 
Blue gray, with small vermicular white spots. End of snout white ; dorsal nearest the head. 
Six feet and seven inches long; teeth, JJ,. No specimens; described from drawing (Peale). 
This species is referred by Cassin (as I think, erroneously) to D. ceruleo-albus, Mayen, a south 
Atlantic species; and to D. Chamissonis, Wiegm., by Gray. 
Captain Marston, of the schooner Maggie Johnstone, on a voyage from Tahiti to San Francisco, 
obtained a Specimen of a porpoise which is not improbably the species described by Peale. He 
informed me that the animal was gray, lighter below and darker above ; that some of the same 
"school" had white noses, but in others the snout was light gray. The dorsal is rather small. 
The specimen was obtained in latitude 13° north. The skull presents intermediate characters 
between several of Gray's sections, and agrees with none of the skulls described or figured in the 
works accessible to me. It is in the collection of the California Academy of Sciences. 
