ANNIVERSARY ADDRESS OF THE PRESIDENT. 47 
genera, amongst which Teleosaurus and Steneosaurus are types, it 
may be found convenient to remove Steneosawrus Manseli into a 
' separate genus:or subgenus; but at present I would venture to 
deprecate any disturbance of the original name. 
Ascending from these lower Wertouenta to Mammalia, Sir R. Owen, 
in a paper “On the Skull and Dentition of a Triassic Mammal, 
Tritylodon longevus, O., from South Africa,’ brought under our 
notice on 21st November a skull which, if the age of its gisement 
be established, is one of the earliest evidences yet obtained of 
Mammalian life. The resemblance of the crowns of the molar 
teeth to those of Microlestes and Stereognathus suggests an affinity 
with these. A doubt expressed in the debate respecting the Mam- 
malian nature of the skull has since been: dispelled by the removal 
of a portion of the outer alveolar wall, which has discovered the 
molar teeth to possess double roots. 
The only other mammalian paper received was one by Prof. Boyd 
Dawkins,“ On the Alleged Existence of Ovibos moschatus in the Forest- 
bed, and its Range in Space and Time.” ‘The subject of this very 
interesting communication was the upper part of the skull of an 
adult female, fortunately in such excellent preservation as to place its 
identification beyond doubt, ‘The author referred to the discoveries 
of remains of this animal in Britain, some of which were in post- 
glacial beds, and others in beds regarded by him as preglacial, In 
this latter category he was disposed to place the present fossil. In 
the debate doubts were expressed respecting the completeness of the 
evidence of the locality whence the skull was procured, and conse- 
quently of its geological age. 
The time and scope permissible to an address will not allow me, 
even if I possessed the requisite knowledge for the task (and this I 
may not claim), to allude to, much less to offer you a review of, the 
progress of the several departments of geology in other countries 
during the past year; but I would not bring my task to a close. 
without referring to some extremely valuable additions which have 
been made to our knowledge of skeletal structure in the Dinosauria, 
a subclass of Reptilia in which I have long been deeply interested. 
The ‘‘ Notes” on the anatomy of Jguanodon, based on the large. 
number of remains preserved in the Musée d’Histoire Naturelle at 
Brussels, begun by M. Dollo last year, have been continued by him ; 
and thanks to the labours of this discriminating and zealous paleon- 
tologist, we have now a knowledge of the skeleton of this Dinosaur 
so full that there remain only a few and not very important details 
to render it complete. M. Dollo’s “ Note on the pelvis and skull” is 
very important. I may be pardoned for remarking that to myself it 
was a matter of great satisfaction to find confirmed by him the ider- 
tification of the skull which, in 1871, I had the honour of bringing 
under your notice *. Perhaps the most interesting feature in the skull 
is the mandibular element, aptly designated by M. Dollo “ Os présym- 
physien ” (fig. 1 ps), the true skeletal place of which the complete- 
ness of the Bernissart fossils has enabled him to demonstrate by the. 
* Quart. Journ. Geol. Soe. vol. xxvii. p. 199, pl. xi. (Hulke). 
