GENUS PSEUDORCA. 143 



Glohiocephalus sibo, wbicli appears in the same work (1. c), is a name 

 iittacbed by Gray to au uurecognizable cetacean, stated by Scblegel in 

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

 the blacklish. It should be expuuged. 



10. PSEUDORCA Reinhardt. 



Fseudorca, Reinhardt, K. Dansk. Videns. Selsk. Forhandl., 1862, p. 151. 

 This genus is sufficiently well distinguished from Orca, its nearest 

 ally, by its small dorsal tin, 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). 



Phoccvna a-assidens, Owen, British Fossil Mammals and Birds, 1846, p. 516. 



Orca crassidens, Gray, Zool. Erebus & Terror, 1846, p. 33; Catalogue of Cetacca, 



1st ed., 1850, p. 94. 

 Fseudorca crassidens, Reinhardt, K. Dansk. Videns. Selsk. Forhaudl., 18G2, p. 151. 

 Orca meridionalis, Flower, Proc. Zool. Soc. London, 1864, p. 4'20. 

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

 Glohiocephalus Graiji, Biirmeister, Aualos Museo Pub. Buenos Aires, i, 1864-'69, 



p. 367, Pi. 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 Reinhardt'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 ideutical with that described by 

 Reinhardt. The former writer has had greater opportunities than my- 

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

 limited studies lead me to concur in 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. 2981, 2985, 2986, 

 2987 (respectively, 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 foss;e. The maxillary and malar bones 

 at the notch are especially thickened. The triangular prenareal region 

 is concave in No. 2987, the youngest specimen, but is flatter in differ- 

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

 posterior margin of the ten)poral 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 fossic is absolutely greater in 

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



* Flower, Cat. Osteol. Specimena in R. Coll. Surg. Loudon, Part II, Mammalia, 1884, 

 p. 573. 



