CATALOGUE OF THE CETACEA. 297 



Orea rectipinna. PL xvii, fig. 1. 



0. rectipinna, Cojoe, Proc. Phil. Acad. 18G9, p. 25; Scammon, 1. c, p. 5G, fiy. 15, IG. 



North Pacific, coast of California, Bering Sea. 



Black, with high, erect dorsal. Skull? coll. Scammon. Skull, coll. Cal. Acad. Sci. Estab- 

 lished on Scammon's figures and descrij)tions. 



The first skull referred to is supposed to be that of 0. rectipinna, but this is not absolutely 

 certain. The most notable peculiarities are the turning ujj and in of the posterior ends of the 

 maxillaries, by the side of the nasals, and to some extent over the posterior ends of the jsremaxil- 

 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, internalh' 11 .00 



Length of beak before the maxillary notches 21 .00 



Length from tip of beak to anterior margin of superior nares 21 .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 skuir at vertex 10 .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 premaxilhe at middle of beak 4 .GO 



Breadth of the fissure between them .75 



Breadth of condjdes 7,50 



Closest approximation of coud^yles l)eneath the foramen magnum .10 



Height of foramen magnum ( notched above ) 3 .25 



Width of foramen magnum 2.(5 



Teeth in upper jaw, 12 or 13 (lost.) 



Orea 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 Captain 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 ^^ ■'^° 



Tip to posterior edge of last tooth 13 .00 



Length of svmphy sis *" 



or/-. 



Height of ramus at coronoid process ° -'-"^ 



01 fin 

 Width between outsides of articular surfaces -i . - u 



Width behind posterior teeth , 10 .00^ 



Leno-th from tip to anterior notch of dental foramen 17 .00? 



Height of largest teeth above alveoli -^ -'^^ 



Mabine Mammals.— 38. 



