Reports & Proceedings—Zoological Society of London. 333 
vertebrates recorded from the Pleistocene cave and fissure deposits 
of the island. 
2. May 23, 1916.—Dr. Henry Woodward, F.R.S., Vice-President, 
in the Chair. 
The Rev. H. N. Hutchinson, M.A., F.Z.S., exhibited the plaster 
cast of a model, four feet long, which he had constructed of the 
Dinosaur, Diplodocus carnegier. 
Lieut. R. Broom, M.D., C.M.Z.S., R.A.M.C., read a paper on the 
structure of the skull in Chrysochloris. 
Two stages in the development of the skull have been studied. 
The earlier is that of a newly born Chrysochloris hottentota, whose 
skull has been cut into microscopic sections and reconstructed, and 
a somewhat later stage of Chrysochloris asiatica, whose skull has been 
prepared for the study of the membrane-bones. The following are 
the most interesting features discovered :— 
External to the exoccipitals on each side is a large membrane-bone 
which partly covers the petrosal or periotic. This is believed to be 
the homologue of the bone which occurs in Therapsid and most 
primitive reptiles, and usually referred to as the tabular. The 
sections prove that it is no part of the auditory capsule. 
Along the inner side of the prearticular or ‘‘ goniale ’’—the little 
membrane- bone which supports the underside of the upper end of 
Meckel’s cartilage—is a second membrane-bone, which, it is believed, 
has not been previously recognized in the mammal skull. This may 
be the homologue of the reptilian surangular. 
_ Under the back part of the nasal capsule, and situated between the 
_ capsule above and the alisphenoid and pterygoid below, is a large 
membrane-bone of doubtful significance. It is probably the homologue 
of the ‘ postero-lateral vomer’’ of Parker. 
The skull is held to be in some respects highly specialized and in 
. others degenerate, although also retaining a number of very primitive 
characters. 
Dr. C. W. Andrews, F.R.S., F.Z.S., described an incomplete 
sternum of a gigantic carinate bird from the (?) Kocene of Nigeria. 
Comparison with the sterna of several groups of birds leads to the 
conclusion that this specimen, though differing considerably from the 
sternum of any living member of the group, belonged to a very large 
representative of the Tubinares. It has about twice the linear 
dimensions of the sternum of an Albatross, of which the spread of 
Wing (in the flesh) was 10 ft. 8in. It is proposed to refer this 
species to a new genus Gigantornis, the specific name being 
G. eaglesomet after its discoverer. 
Dr. A. Smith Woodward, F.R.S., V.P.Z.8., read a paper on 
_ amammalian mandibular ramus from an Upper Cretaceous formation 
in Alberta, Canada. ‘The specimen represented an opossum-like 
marsupial, and he referred it to a new species of Cimolestes named 
C. cutlert in honour of its discoverer, Mr. William E. Cutler. The 
close dental series behind the canine measured 30 mm. in length, and 
the molars differed from those of the two known species of the genus 
in their relatively less elevated trigonid. The fourth premolar was 
