Mr. T, Altht-y vn AiithruLMSiiurus Russelli. 1()7 



KXI'LANATION UF TIIK I'l-ATlvS. 

 I'LATE Vlll. 



Fig. 1. Upper surface i)f cranium of Anthracosaurtu Russelli, one third the 

 natural size; P.max, prnninnxilln; M.ff, niuous-proove ; Aji.o 

 anterior na.sil orilire ; \, lui.-ul bone ; Max, maxilla ; L, 

 lacrvnuU bone ; Ju, ju;rnl ; Qnju, quadnite-jufral ; Qu, (juadrate ; 

 6'.^ suprattuiitoral ; O. l', orbital vac-uitics ; /■'/•, front al.s ; Pr.fr, 

 prefrontal; lt.fr, poslfrontal ; It.O, postorbitnl; /', p.-irietal.-i, 

 with parietal f^jrainen ; .S'y, squamous; <S'. O!-'. siipraoccipital, so 

 called; J\, epiotic : 7'./', temporal fos5a ; -S'.O, supraoccipital ; 

 E.S, excx-iijiital; Mmid, anterior end of left mandible overlying 

 part of skull ; P.B. palate-bone, pusterior end of right side dis 

 placed. 



Fig. 2. Upper, and fig. 3 under surface of a dermal scute : a, anterior 

 end. 



Pl.\te IX. 



Under surface of same cranium, one third the natural size. P.max, pne- 

 maxilla ; V, vomer; N.C, nasal channel; Max, maxilla; Pal, 

 palatc-bone ; P. 7", palate-tusk ; P./.y;. palate-teeth, small prs- 

 terior serie* ; O. I , orbital vacuities ; IHer, pterviroid bone ; 

 B.sph, ba.-^isphenoid ; Pr.sph, prespheuoid ; Pr.fr, prefrontal; 

 L, lacrymal; Ju, jugal ; Qu.Ju, quadrate-jugal ; Ji.oc, ba.si- 

 occipital ; Qu, quadrate ; Marul, right ramus of mandible over- 

 lying part of right side of skull. 



Platk X. 



Fiy. 1. Inner surface of right mandible of same, one third the natural 

 size. Ar, articular piece ; D, dentary ; S, splenial ; An, angular ; 

 Sym, symphy.*is. 



Fig. 2. Outer surface of left mandible, one third the natural size. Ar, 

 articular piece : I), dentary ; An, angular ; Mg, mucus-groove. 



Fig. 3. Dorsal rib, two thirds the natural size. 



Fig. 4. Dorsal vertebra, natural size, entire. 



Plate XI. Sections of teeth of Anthracosauras. 



Fig. 1. Transverse section of maxillar\- tooth near to apex and above pulp- 

 cavity, magnified 12 diam. F, enamel ; I), dentine. 



Fig. 2. Transverse sertion just below top of pulp-cavity. E, thin enamel ; 

 /)./, light dentine ; J).d, dark dentine ; P, pulp-cavitv ; short 

 infolding? of peripheral bands (PI) into apices of fusiform light 

 dentine are seen, also rudimentary radiations of pulp-cavitv. 



Fig. 3. Transverse section a little below tig. 2 and above the radiations of 

 the pulp-cavity, the rudiments of which are indicated as in 

 fig. 2. D.l, light dentine ; D.d, dark dentine ; P, pulp-cavity, 

 the infolded peripheral bands (J'l) extend inwards two thirds "of 

 the distance towards the pulp-caviiy. 



Fig. 4. Transverse section a little below the level of the alveolar border. 

 I).l, light dentine ; I).d, dark dentine ; P, pulp-cavity ; PI, 

 periphtr.il band infolded ; 7', irregular radiations of pulp-cavitv. 



Fig. fi. Portion of fig. 4. mr.pnified 4^ diameters; ilf, toothlets; D.l, light 

 dentine ; /).r/. dark d'-ntine ; PI, peripheral band infolded and 

 sinuous ; Pf'P, pulp-cavitv. 



12* 



