ZOSLOGY. 4 . QA1 
Pachyglossa, and associated with certain extinct forms into the order 
Rhynchocephalia. This is in consequence with the full statement of 
its structural characters by Giinther, and I accept the new order 
proposed for it by this author, with some change of diagnosis. 
Third, the Zonuridw are regarded as distinct from the Lacertide 
on account of their papillose tongue. 
4, In the Ophidia, the Typhlopide and Stenostomide are united 
into one order, the Scolecophidia, as already done by, Duméril and 
Bibron. I separated them in the system proposed in connection 
with that of the Lacertilia in 1864, on account of the supposed ab- 
sence of the prefrontal bone in Typhlops while it is present in 
Stenostoma. I find, however, that the large bone I supposed to 
‘be maxillary in Typhlops, is really the prefrontal, and that ,the 
maxillary is concealed on the inferior face of the skull, being rep- 
resented by a narrow strip alongside of the vomer. 
9. On thé Rhynchocephalia and supposed Lacertilia of the 
Trias and Permian. 
The existence of Lacertiliain the Trias has been asserted by Pro- 
fessor Huxley, as indicated by the genera Hyperodapedon, Teler- 
peton, Rhynchosaurus, and Saurosternum.* For us the evidence 
furnished by these and other genera is conclusive only as to the 
presence of the Rhynchocephalia in beds of that age, while the 
existence of the Lacertilia remains undecided. The other genera 
-are from Germany ; viz., Proterosaurus, Sphenosaurus, and Phane- 
rosaurus, of Meyer. Of these the first two are believed by Huxley 
to be Lacertilia.f 
The characters of the Rhynchocephalia have been in part, 
pointed out in the preceding pages. Other features, especially of 
the soft parts, can be learned by reference to Giinther’s Monograph 
of Sphenodon, already quoted. 
Of the above genera, Hyperodapedon has the remarkable pala- 
tal structure characteristic of Sphenodon, and entirely unknown 
among the Lacertilia, and I have little doubt that the genus be- 
longs to the same order; viz., the Rhynchocephalia. In all of the 
remaining genera, the vertebre are flat or sub-biconcave as in 
Rhynchocephalia, and not procelian asin Lacertilia. In defence 
_of the position of Telerpeton as a Lacertilian, Professor Huxley 
cites the biconcave vertebrae of the Gecconide. These are, how- 
ever, fish-like, and ‘enclose within the adjacent conic cavities of 
_ * Jour. Geol. Soc., Lond., 1869, p. 49. ¢ Ibid., p. 87. 
A. A.A.S. VOL, XIX. 31 
