CATALOGUE OF THE CETACEA. 297 
Orca reetipinna. PI. xvii, fig. 1. 
0. reetipinna, Cope, Proc. Phil. Acad. 1869, p. 25; Scamnion, 1. c, p. 56, fig. 15, 16. 
North Pacific, coast of California, Bering Sea. 
Black, with high, erect dorsal. Skull? coll. Scamnion. Skull, coll. Cal. Acad. Sci. Estab- 
lished on Scammon's figures and descriptions. 
The first skull referred to is supposed to be that of O. reetipinna, but this is not absolutely 
certain. The most notable peculiarities are the turning up and in of the j>osterior ends of the 
maxillaries, by the side of the nasals, and to some extent over the posterior ends of the premaxil- 
laries. The transverse frontal ridge is very high and thin, the back of the skull behind it quite 
flat; in the temporal fossa, in the line of union of the squamosals and parietals, and extending 
some distance each side of the suture, is a ridge, or blunt carina, nearly as long as the fossa. 
The measurements of the cranium are as follow, in inches and decimals. The individual was 
doubtless rather aged : 
Length of skull in a straight line 39 .00 
Length of brain cavity, internally 11 .00 
Length of beak before the maxillary notches 21 .00 
Length from tip of beak to anterior margin of superior nares 24 .50 
Length from tip of beak to posterior notch of palate 25 .00 
Length from tip of beak to posterior edge of last tooth 17 .00 
Length from tip of beak to frontal ridge 32 .50 
Height of skull at vertex 16 .50 
Greatest breadth ( at zygomatic process of squamosals ) 25 .00 
Breadth of supra - orbital ridge 23 .00 
Breadth between maxillary notches 11 .50 
Breadth at middle of beak 10 . 50 
Breadth of the two premaxilloe at middle of beak 4 .60 
Breadth of the fissure between them .75 
Breadth of condyles 7 .50 
Closest approximation of condyles beneath the foramen magnum .40 
Height of foramen magnum ( notched above ) 3 .25 
"Width of foramen magnum 2 .75 
Teeth in upper jaw, 12 or 13 (lost.) 
Orca ater. PI. xvii, fig. 2. 
0. ater, Cope, 1. c, p. 23; Scammon, 1. c, p. 58, fig. 17. 
0. atra, Gray, 1871, p. 92. 
Coast of California and Oregon. 
Smaller, with a white spot before the pectorals ; white below, with a maroon colored, crescentic 
spot behind the dorsal. Established on Scammon's descriptions and figures. 
A jaw, supposed, with some probability, to belong to this species, is in Caj)tain Scammon's 
possession. It is of an adult individual, but retains all the teeth, and measures as follows, in 
inches and decimals : 
Length of ramus 28 .00 
Tip to posterior edge of last tooth 13 .00 
Length of symphysis 6 .25 
Height of ramus at coronoid process 8 .50 
Width between outsides of articular surfaces 21 .00 
"Width behind posterior teeth 10 .00 
■ Length from tip to anterior notch of dental foramen 17 .00? 
Height of largest teeth above alveoli 1 .30 
Marine Mammals.— 38. 
