GENUS PSEUDORCA. 143 



GlobiocepJialiis sibo, wliicli appears iu the same work (I. c), is a name 

 attacUed by Gray to au uiirecoft'uizable cetaceau, stated by Sclilegel in 

 the Fauna Japonioa to be considered by Japanese writers a variety of 

 the blackfish. It shoukl be expunged. 



16. PSEUDORCA Reinhardt. 



Pseiidorca, Reiuhardt, K. Dansk. Videns. Selsk. Forhaudl., 1862, p. 151. 

 This genus is sufficient!}' well distinguished from Orca, its nearest 

 ally, by its small dorsal flu, pointed pectorals, short alveoli, closely ap- 

 proximated pterygoids and other characters, pointed out by Reinhardt~ 

 and Professor Flower, to merit a separate generic appellation. 



PSEUDORCA CRASSIDENS (Owen). 



Phocana crassidens, Owen, British Fossil Mammals and Birds, 184G, p. 516. 



Ovca crassidens, Gray, Zool. Erebus & Terror, 1846, p. 33; Catalogue of Celacoa, 



1st ed., 1850, p. 94. 

 Pseudorca crassidens, Reiuhardt, K. Dansk. Videns. Selsk. Forhaudl., 1862, p. 151. 

 Orca meridionalis, Flower, Proc. Zool. Soc. Loudon, 1864, p. 420. 

 Orca destriicter, Cope, Proc. Acad. Nat. Sci. Philadelphia, 1866, p. 293. 

 Glohiocephalus Graiji, Buruieister, Anales Museo Pub. Bueuos Aires, i, 1864-'69, 



p. 367, PL XXI. 



According to Professor Flower, the subfossil specimen which formed 

 the type of this species, from the Lincolnshire fens, is lost.* We have, 

 therefore, only Sir Richard Owen's description and figures to guide us 

 in identifying other specimens with the type. Au examination of these 

 leaves little room for doubt that Reinliardt's specimens were specifically 

 identical with Sir Richard Owen's type. Professor Flower has also re- 

 cently stated his opinion that the form previously' described by him un- 

 der the name of Orca meridionalis is identical with that described by 

 Reiuhardt. The former writer has had greater o[)[)ortunities than my- 

 self for the comparison of specimens of this species, but my own more 

 limited studies lead me to concur iu his opinion regarding the specific 

 identity of all the specimens of the genus thus far acquired. 



Of four skulls in the Royal College of Surgeons, Nos. 2084, 2985, 2986, 

 2987 (respecti^-ely, 58.04"", 59.4' ", 58.4-", 51.05""), No. 2985, which is 

 the largest, is much the heaviest, having a rounded broad, snout and 

 strong ridges about the temporal fossre. The maxillary and malar boues 

 at the uotch are especially thickened. The triangular prenareal region 

 is concave in No. 2987, the youugesb specimen, but is flatter in difter- 

 eut degrees in the other skulls. The strength of the ridge forming the 

 posterior margin of the temporal fossa increases greatly from its condi- 

 tion in No. 2987, the youngest specimen, to No. 2985, the oldest, so that 

 the distance between the margins of the fossre is absolutely greater in 

 the smaller skull. Tlie pterygoids in these skulls are slightly separated 



* Flower, Cat. Osteol. Specimens iu R. Coll. Surg. Loudou, Part II, Mammalia, 1884, 

 p. 573. 



