CETACEA. 141 
a. Stuffed. West Coast of Africa. Presented by Messrs. 
rster, Smith, and Co. 
r.? Manatus nasutus, Wyman, Proc. Boston N. H. 8. 1. 198; 
Amer. Journ. Sci. ix. 13. t. 
hab. W. Africa, Vavallo River. Called Ne-hoo-le. Imperfect 
skull, Mus. Boston Nat. Hist. Soc. 
2. HALICORE. 
Cutting teeth ¢; two mner upper and the four lower decidu- 
ous ; the two outer upper conical, elongate, permanent. Canine 
me. Grinders $-3, truncate, with two lateral grooves. Lips 
bristly ; fore-feet fin-shaped, clawless. Caudal fin lunate, sinu- 
fed. Body hairy. Czecum undivided. Pelvis bones distinct. 
‘Dugungus, Tiedemann, Zool. i. 554. 
Idobenus, Rafin. Anal. Nat. 60, 1815. 
gong, Lacep. 
falicore, Illiger, Prod. 140, 1811; Oken, Lehrb. 689, 1818; 
Schinz. 493; Knox, Cat. Prep. Whale, 35, 1838. 
psmarus, pars, Boddaert. 
richecus, pars, Eraleb. 
Cervical vertebre 7, dorsal 19; ribs 19 ; lumbar, sacral and coe- 
pygeal, 30=56; V-shaped bone commencing between the 32nd 
ad 33rd vertebree. Weight of cranium and lower jaw, 7 lbs. 6 02.; 
f bones of trunk, 203 lbs.; of pectoral extremities, 3 Ibs.=30 lbs. 
10 oz., the weight of an entire male adult human skeleton being 
‘only 12lbs. The bones are extremely dense and of stony hard- 
ness; they contain no medullary cavity, but consist of a texture 
mearly as close as ivory and capable of beimg polished.—Knoz, 
Jat. Prep. 35, 1838. : 
_ The tusks and teeth are “composed of two substances, a cor- 
eal and a medullary; the cortical, although holding the situa- 
ion of enamel, is similar to bone, and possesses none of the qua- 
ities 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 
scent state with a horny covermg. The outer surface presents 
umerous rough-looking elevations, many of them darker around 
le circumference than in the centre; these are arranged in rows 
7 or 8 each, running from each side towards the mesial line, 
ut with a slight mclimation from behind forward. The whole 
bstance is composed of bristles about 3 of an inch im length, 
ranged vertically, and agglutinated together by a substance of 
horny nature. Since examining the Dugong, now seven years 
