CATALOGUE OF THE CETACEA. 289 
with the inner edges obliquely inclined to the vertical plane of the ramus. The measurements, in 
inches and decimals, are as follow : 
Length from end of beak to condyles 16 .80 
Length from end of beak to end of coronoid process 15 .80 
Length from end of beak to end of tooth line 9 .30 
Length from end of beak to inner notch of dental foramen 11 .00 
Length of symphysis 2 .00 
"Width between outer edges of condyles 9 .75 
Width between inner corners of condyles 6 .50 
"Width between two posterior teeth 3 .50 
Width between teeth at posterior end of symphysis 1 .40 
Width between anterior teeth .75 
Height of ramus at coronoid process 4 .40 
Height of ramus at jjosterior tooth 2 .25 
Height of ramus at twelfth pair of teeth 1 .50 
Height of ramus at middle of symphysis 1 .70 
Thickness of ramus at twelfth pair of teeth .85 
Height of largest tooth above alveolus .80 
Height of smallest tooth above alveolus .42 
Transverse diameter of larger teeth .38 
Diameter in the plane of the ramus .33 
The angle at which the rami meet behind the symphysis is quite acute. The anterior end of 
the symphysis from above arjpears bluntly rounded, and has a narrow median groove. 
This species does not appear to have been described, and though the material at hand is 
unfortunately very slender, I have applied to it the name of Tursiops Gillii. The specimen was 
obtained at Monterey, California, in 1871. The hardly-worn appearance of the teeth suggests that 
it was a young animal, though the bones are thoroughly solidified. The only other species which 
may be found in the books, from the Pacific or its vicinity, is the T. catatonia, Gray, N. W. 
Australia, and it is described as being lead -colored. 
Genus Cephalorhynchus, F. Cuvier. 
Cephalorhynchus, F. Cuvier, Cetac., p. 158. 
Eutropia, Gray, P. Z. S. 1862, p. 145; 18C6, p. 262; 1871, p. 75. 
Cephalorhynchus Eutropia. 
Delphinvs Eutropia, Gray, P. Z. S. 1849, p. 1. 
Eutropia Dickiei, Gray, P. Z. S. 1866, p. 215; 1868, p. 7, pi. 34; 1871, p. 75. 
Tursio Eutropia, Gray, 1866, p. 262. 
Coast of Chile, South Pacific Ocean. 
Skull, 15 inches; beak, 8 inches; width at notch, 3.5 inches. Sides of skull bent down 
behind the notch. Teeth, ||, five or six in an inch. Skull only, Coll. Dickie. 
Some one of the species described from drawings, and of which the skull is unknown, may be 
identical with this. 
Makine Mammals.— 37. 
