26 



DESCRIPTION OF THE PLATES 



series, upper jaw, of the Capybara (Hy- 

 drochcerus Capibara). Cuvier, Oss. Foss. 

 Fig. 18. Right ramus of the lower jaw, 

 with the incisor and the two molars, 

 magnified, of the Australian Water-rat 

 (Hydromys flaviventer) . F. Cuvier. 



PLATE 106. 



View of a section of the incisor of a Beaver 

 (Castor fiber), under a magnifying power 

 of 250 linear dimensions, reduced to one 

 third the size as so viewed : d d, the 

 dentine forming the convex side of the 

 incisor ; d', the dentine forming the con- 

 cave side ; v v, vascular canals of the 

 central tract of vaso-dentine ; e, inner 

 layer of enamel; e\ outer and denser 

 layer of enamel ; c, thin outer layer of 

 coloured cement. Original. 



PLATE 107. 



The magnified sections of teeth in this, and 

 the two following plates, are figured as 

 seen on a dark ground, by reflected light. 

 Fig. 1. Transverse section of a molar 

 of a Squirrel (Sciurus vulgaris). Fig. 2. 

 Ditto of a Beaver (Castor fiber) : d, den- 

 tine ; e, enamel ; c, cement. Erdl* 



PLATE 108. 



Fig. 1. — Transverse section of the molar of 

 a Rat (Mus decumanus) . Fig. 2. Verti- 

 cal section of the molar of a Flying 

 Squirrel (Pteromys volucella) : d, dentine; 

 e, enamel ; c, cement. Fig. 3. Transverse 

 section of the molar of a Water- Vole 

 (Arvicola amphibia) : d, dentine ; e, ena- 

 mel ; c, cement ; o, osteo-dentine. Erdl. 



PLATE 109. 



Fig. 1. — Transverse section of the molar 

 of a Hare : d, dentine ; e, enamel. Fig. 2. 



* Abhandlungen der K. Bayerischen Akademie : Bd. iii. 

 1841. 



A small portion of the dentine of a 

 Beaver's tooth, magnified more highly to 

 show the secondaiy undulations of the 

 dentinal tubes. Fig. 3. A small portion 

 of the dentine of a Calf's molar more 

 highly magnified, showing the terminal 

 loops and branches of the dentinal tubes. 

 Fig. 4. A small portion of the cement 

 of the same tooth similarly magnified, 

 showing the cemental tubes and cells. 

 Erdl. 



PLATE 110. 



Fig. 1.— Teeth of the Cape-Mole (Chryso- 

 chloris aurea). Fig. 2. Teeth of the 

 Virginian Shrew-Mole (Scalops aquaticus). 

 Fig. 3. Teeth detached, and jaws showing 

 the sockets, of the Common- Mole (Talpa 

 europaa) : i, incisors ; c, canines ; p, 

 premolars ; m, molars. Fig. 4. Teeth 

 detached, and jaws showing the sockets 

 of a Shrew (Sorex tetragonurus. Duver- 

 noy.). Fig'. 5. Teeth detached, and 

 jaws showing the sockets of the Hedge- 

 hog (Erinaceus europceus). Fig. 6. Teeth 

 detached, and jaws showing the sockets 

 of the Tenrec (Centetes ecaudatus). From 

 De Blainville. 



PLATE 111. 



Fig. 1. — Teeth and different views of the 

 incisors of the Solenodon paradoxus. 

 Brandt : a, front view of upper incisors ; 

 a', back view of an upper incisor ; b, 

 front view of lower incisors ; c, inside 

 view of one lower incisor, showing the 

 deep groove. Fig. 2. Base of cranium, 

 magnified, of the common Shrew {Sorex 

 araneus), showing the crowns of i, the 

 single incisor ; p, the premolars ; m, the 

 true molars. Fig. 3. Upper jaw showing 

 the crowns of the teeth of the Tupaia 

 [Glhorcx tana). Fig. 4. Upper jaw 



