34 



Mam. 515, confines the name Delphiims Orca to the ani- 

 mal intended by the ancients, and cliaracteiizes it " Museau 

 coiiforme connne celui de Dauphin vulgaire ; dents larges 

 et crenulecs, sur lenvs bords," being a translation of Arte- 

 di (Gen. Piscium, 76, 3) " D. rostro sursum repando, den- 

 tibiis latis sevratis." 



Professor Eschricht believes the Physeier microps of O. 

 Fdh. to be the Killer, Dan. Trans, xii. 



The Lincolnshire Killer. Orca crassidens. 



Phoca;na crassidens, Owen, Brit. Fossil Mam. 516, f. 

 ■213, 216, 214. 



Intcrniaxillaries rugose in front. Teeth \%, large, coni- 

 cal, rather acute (all but the front lower false), near to the 

 preorbital notch. Lower jaw verj depressed and broad 

 in front at the symphysis. 



luhab. Fens of Lincolnshire, Fossil, Mus. Stamford 

 (now Mus. Col. Surg. ?) 



Skull, length entire .... 23 or 24-0 



„ nose 12'6 



„ teeth line .... .... lO'O 



„ lower jaw .... .... 21*0 



Breadth at notch .... .... 86 



„ at middle of beak .... 80 



„ of intermaxillaries .... 5*6 



In the figure the beak is, \j the length of the base at 

 the notch and exactly the length of the skull. 



The Cape Killer. 

 Tab. 9. 



Orca Capensis. 

 Skull. 



Delphinus globiceps. Cat. I\Ius. Col. Surg. 165, /(. 

 1139. Grant, Proc. Zool. Sac. 1833, 65. 



D. Orca, Owen, Brit. Fossil Mam. 516. 



Skull flattish above, rather concave in the middle before 

 the blowhole. Nose rather convex on the side, rather ta- 

 pering in front. Teeth \\, very large, thick, nearly to the 

 preorbital notch, concave on each side, for the reception 

 of the opposite teeth, of the front upper small, acute, front 

 lower large, worn down, rounded. Intermaxillaries rather 

 dilated, and broader over the front of the nose, contracted 

 behind. 



Inhab. Southern Ocean. Cape of Good Hope, M. Vi- 

 toe (1818), Mus. Col. Surg. n. 1139. Northern Pacific 

 Ocean, Capt. Delvitte, R. N. 



Skull, length entire .... 37'0 .... 36-6 



„ of nose .... 18-0 .... 18-0 



„ of teeth line 14-6 .... 14-6 



„ of lower jaw 29'6 



Breadth at notch .... 126 .... 12-0 



„ at orbit .... 21.0 .... 21-0 



„ at temple above 20'0 

 „ at middle of beak 100 



,, of intermaxillaries 3'9 



„ in front 4'6 



„ in middle 3'3 



The skull in the College of Surgeons appears to be 

 the one which Mr. Owen gives the measurement of as D. 

 orca, in his account of P/ioctcna crassidens. 



SxMALL Killer. Orca intermedia. 



Tab. 8. Skull. 



Delphinus interraedius, Gray, Ann. Phil. 1827, 396, not 

 Harlan. 



Nose of skull half the entire length. Teeth 4-r long) 

 conical. 



Inhab. 



Skull, British Museum. 



This skull, which has all the appearcince of being that 

 of a full grown animal, is just one quarter the length and 

 breadth of the skull of the common Killer. 



Skull, length entire 14"0 inches and lines. 



„ of nose .... 7'0 



„ of teeth line .... 5'6 

 „ of lower jaw 11 '0 

 Breadth at orbits .... 8'3 

 „ at notch .... 46 

 „ at middleof beak '9 



B. Head beaked. Nose of skull longer than the brain- 

 cavity. 



Lagenorhynchus, Gray. 



Head rather convex, gradually sloj)ing into the beak in 

 front. Beak short, tapering in front. Lower jaw rather 

 longest. Body elongate, tapering behind, largest at the 

 pectoral fins. Pectoral fins rather far back, rather elon- 

 gate and slightl}' falcate. Dorsal fin high, falcate, rather 

 behind the middle of the back. The back with a low, 

 rounded, fin-like ridge near the tail. Tail-lobes rather nar- 

 row, elongate. Skull rather depressed, the hinder ends of 

 the maxillary bones expanded, horizontal, and rather 

 thickened on the edge. The nose is short, broad, flat above 

 and rather narrowed in front, and scarcely longer than the 

 length of the brain-cavity. The triangle in front of the 

 blowers is elongate, and reaches beyond the middle of the 

 nose of the skull, and the intermaxillaries arc separated by 

 a deep groove filled with cartilage. 



This genus is easily known from Delphinus by the low- 

 ness of the forehead, the short and depressed form of the 

 beak, the posterior position of the dorsal fin, and the body 

 being attenuated behind. It is at once known by the 

 breadth, and flat, expanded form of the nose of the skull. 



The OS hyoides of L. leucopleurus is large and 

 broad. 



* Beak very short ; nose of skull only as long as head ; 

 teeth nearly to the notch. 



White-sided Bottle-nose. Lagenorhynchus 

 leucopleurus. 



Tab. 6. Foetus, 12. Skull, t. 26,/. 3, tongue. 

 Delphinus leucopleurus, Rasch, Mag. Jul. 1843, 869. 



Above bluish black, beneath white, with a large, ob- 

 lique, gray or white longitudinal streak on hinder part 

 of each side. Teeth f 4' small, acute, curved. 



Skull : brain-cavity large, high at the top behind the 

 blow-hole ; nose nearly as long as the brain-cavity, gradu- 

 ally and regularly tapering on each side ; triangle in front 



