MANATUS. 157 



the posterior was seen on the inner surface of the man- 

 dible immediately above the dental foramen. Locality 

 of origin not known, but probably from West Africa. 



3. Tympano-periotic bones, right, of Manatee, No. 2 in 

 Catalogue. The tjnnpanic is an imperfect ring, 

 similar in form and connection to that of the Dugong, 

 and with its broad end directed downwards, forwards, 

 and inwards. The long diameter is 2 inches. The 

 periotic is 2j'jj inches in its longest diameter, and 

 gives rise to an ovoid prominence which fits into 

 the concave surface of the squamous temporal. A 

 columnar stapes projects from the periotic into the 

 tympanic cavity. The bones are represented in the 

 subjoining figure, as seen on the outer surface. 



4. Fcetus of M. senegalensis. Length 2 feet 10 inches from 

 muzzle to end of tail; breadth of tail 7i inches; 

 length of pectoral limb 6^^% inches. Silky hairs 

 scattered over body, tail, and flippers. Muzzle de- 

 lined above and at the sides by a crescentic fissure ; 

 \ inch below it are the two nostrils. Lip consists 

 of a mid and two lateral portions. Tip of tongue 

 mox»able, with a distinct fmenum. Crowns of several 

 molars have cut the gums. Lower lip thick, flexible 

 and truncated. Nails on dorsum of four fingers, but 

 not on pollex. Described by Turner in Journ. Anat. 

 (tnd PJiys., vol. xxviii., 1894. See Plate XVIL, muzzle 

 and pectoral limbs. 



