I 88 



TEETH OF AARD VARK 



Thomas 1 there are seven milk teeth on each side of the upper 

 jaw (limited to the maxillae, and thus not incisors). An eighth 

 tooth was discovered on one side of one of the specimens examined 

 hy Thomas. In the lower jaw there are only four milk teeth on 

 each side. It is interesting to note that the histological structure 



Fig. 108. — Section of lower jaw with the teeth of Onjcteropus. x 2. (After Owen.) 



of these milk teeth agrees with that of the permanent teeth. 

 Tliere are two species of this genus found in Africa : the southern, 

 0. rupensis, is more hairy than the northern, 0. aethiojiicus. 

 0. gnticlryi is a Pliocene species from the Island of Samos and 

 from Persia, described by I)r. Forsyth ]\Iajor and Dr. Andrews.- 

 It closely resembles the existing 0. aethiopicus. 



Of the Scaly Anteaters, ( Troup Srii'AiiATA or Manidae, there 

 is really but one genus, though Plbcdagin, FhoUdotus, Snin/sia, 

 and Pangolin ha^'e been used to distinguish various forms. The 

 genus 2L(nis is African and Oriental in range. Dr. Jentink, who 

 has lately revised the species, allows seven. ^ The external form 

 of these animals is fairly well known, the remarkable scales dis- 

 tinguishing the Pangolins from other animals. Between the 

 scales lie hairs, which seem to be absent in the adults of the 

 African species, though present in the young, thus affording a 

 convenient method of distinguishing the Ethiopian from the 

 Oriental forms. The scale.s have been compared to agglutinated 

 hairs. That they are not " merely mimetic of the Lizards' scales " 

 is held by "Webor,"* who compares them directly with those struc- 



^ Proc. Roy. &'oc. xlvii. 1890, p. 246. 



" Pnic. Zool. Soc. 1893, p. 239, and 1896, p. 296. 



'■' " Revision of the Manidae in the Leyden Museum," Notes Leyd. Mus. iv. 1882, 

 p. 193. 



* Weber, Zool. JSrgehiisse einer Reise in Ninlcrl. Ost Indien, 1892. See also 

 Romer, in Jen. Zeilschr. xxxi. 1896, p. 604, and Reh, ibid. xxx. 1895, p. 137. 



