FROM SOUTH AFRICA AND AUSTRALIA 129 
few-toothed or toothless Dicynodont Reptiles! in the Karoo-beds 
of Africa presents so striking a resemblance with the assemblage of 
Reptiles characteristic of the Fauna of the Trias in this country, that 
one is at first inclined to leap to the conclusion, that the discovery 
of this association settles the question of the age of the African 
formation. When I consider, however, that Labyrinthodont Am- 
phibia range from the Lias down to the Carboniferous formations 
inclusive, and that .J/¢cropholis is not very closely allied to any of 
the more characteristic forms of the Trias, I am inclined to pause 
before drawing any very decided inference from the analogy of the 
Faunas. 
1 Mr. Stow collected in the same locality (at the foot of the Rhenosterberg), together with 
the .W2crophol’s, some Dicynodont remains, to which I hope to return on a future occasion. 
DESCRIPTION OF PLATES XXI. AND XNII. [P.ares 7, 8]. 
PLATE NXI. [PLATE 7]. 
. Skull of wWecrophol’s Siow?2, viewed from above. Magnified 2 diameters. 
. The same, seen from the left side. Magnified 2 diameters. 
. The same, seen from below. Magnified 2 diameters. 
. The posterior end of the right ramus of the mandible, and of the mandibular 
suspensorium of the same. 
5. Transverse section of the mandibular ramus. 
Fig. 6. A portion of the mandible, with teeth 27 sz¢z. 
Fig. 7. The dermal scutes represented in fig. 3, magnified 10 times. 
a 
oo PaO 
winx 
PLATE XXII. [PLATE 8]. 
Fig. 1. Dorsal or superior view of the cranium of Bothréceps Australis. Nat. size. 
Fig. 2. Lateral view of the same, reduced to one-third diam. 
Fig. 3. Transverse section of the snout of Décynodon Murrayt, taken perpendicularly to its. 
axis, just in front of the internal nares | Reduced to one-half diam. 
Figs. 4, 5, 6. Similar sections, taken successively nearer the extremity of the snout. Reduced 
to one-half diam. 
VOL II K 
