MAMMALIA. 525 



Pht/se(er viacrocephalus. — The Great-Headed Cachalot. 

 — Plate XXV. fig. 3.— Described, vol. III. p. 479. 



Sub-Genus 2. — Physeter. — Lacepede. — Spiracle orifice situ- 

 ate d at the end, or near the end, of the upper part of the muzzle ; 

 having a dorsal fin. 



Physeter microps. — The Small-Eyed Cachalot. — Lower 

 jaw with 21 arched, slightly turned back teeth, on each side ; 

 dorsal fin large, straight and pointed ; pectoral fins broad ; eyes 

 small ; sixty to eighty feet long. Inhabits the Northern Seas. 



Genus 7. — Bal^na. — Linnteus. 



Generic Character, — Without teeth ; upper jaw keel-shaped, 

 provided on each side with transverse horny laminae or whale- 

 bone, slender, serrated, and attenuated at the edges ; orifices of 

 the spiracles separated, placed near the centre of the upper por- 

 tion of the head; some species with a dorsal fin ; and nodosities 

 on the backs of others. 



Sub- Genus I. — Bal^na. — No dorsal fin. 



Balana mysticeius. — The Common Whale. — Plate 

 XXV. fig. 6.— Described, vol. III. p. 461. 



Sub-Genus 2 Balenoptera. — With dorsal fin. 



Balcena boops. — The Jubarta. — Nape of neck elevated and 

 round ; with longitudinal folds under the throat and belly ; semi- 

 spherical tuberosities before the spiracles ; dorsal fin curved 

 backwards. Fifty-four feet long. Inhabits the Greenland 

 Seas. 



fv. St K 



