CETACEA. 141 



a. Stuffed. West Coast of Africa. Presented by Messrs. 

 Forster, Smith, and Co. 

 Var. ? Manatus nasutus, Wyman, Proc. Boston N. H. S. ii. 198 ; 



Amer. Journ. Sci. ix. 13. t. 

 Inhab. W. Africa, Vavallo River. Called Ne-hoo-le. Imperfect 



skull, Mus. Boston Nat. Hist. Soc. 



2. HALICORE. 



Cutting teeth f ; two inner upper and the four lower decidu- 

 ous ; the two outer upper conical, elongate, permanent. Canine 

 none. Grinders f -f, truncate, with two lateral grooves. Lips 

 bristly ; fore-feet tin-shaped, clawless. Caudal fin lunate, sinu- 

 ated. " Body hairy. Caecum undivided. Pelvis bones distinct. 



Dugungus, Tiedemann, Zool. i. 554. 



Odobenus, Rafin. Anal Nat. 60, 1815. 



Dugong, Lacep. 



Halicore, Illiger, Prod. 140, 1811; Oken, Lehrb. 689, 1818; 



Schinz.493', Knox, Cat. Prep. Whale, 35, 1838. 

 Rosmarus, pars, Boddaert. 

 Trichecus, pars, Erxleb. 



Cervical vertebrae 7 dorsal 19 ; ribs 19 ; lumbar, sacral and coc- 

 cygeal, 30=56 ; V-shaped bone commencing between the 32nd 

 and 33rd vertebrae. Weight of cranium and lower jaw, 7 Ibs. 6 oz. ; 

 of bones of trunk, 20J Ibs. ; of pectoral extremities, 3 Ibs. =30 Ibs. 

 10 oz., the weight of an entire male adult human skeleton being 

 only 12 Ibs. The bones are extremely dense and of stony hard- 

 ness ; they contain no medullary cavity, but consist of a texture 

 nearly as close as ivory and capable of being polished. Knox, 

 Cat. "Prep. 35, 1838. 



The tusks and teeth are " composed of two substances, a cor- 

 tical and a medullary; the cortical, although holding the situa- 

 tion of enamel, is similar to bone, and possesses none of the qua- 

 lities of that peculiar substance ; the medullary portion is ex- 

 tremely hard, of a dense texture and homogeneous appearance." 

 Knox, Cat. Prep. 36. 



The front portion of the upper and lower jaws is covered in the 

 recent state with a horny covering. The outer surface presents 

 numerous rough-looking elevations, many of them darker around 

 the circumference than in the centre ; these are arranged in rows 

 of 7 or 8 each, running from each side towards the mesial line, 

 but with a slight inclination from behind forward. The whole 

 substance is composed of bristles about | of an inch in length, 

 arranged vertically, and agglutinated together by a substance of 

 a horny nature. Since examining the Dugong, now seven years 



