207 
in Plate I., Figs, i, 2, 3 are uppermost. It is shown as it would stand at 
the bottom of the bubble, and the inner side of the sectional sphere. The 
inner surface is brilliantly polished. 
PLATE XXXIV. 
Reverse side of buttons shown in Plate. 
Fig. 1.—This represents the underside of a dumb-bell form. There are 
curious creases and wrinkled markings or sculpturings that were caused 
when the viscous material was assuming its present shape—a sort of flow 
structure. 
Fig. 2.—Shows a pitted surface, and it is larger than the obverse sur¬ 
face which was inside the bubble. 
Fig. 3.—This under surface ’or surface outside the original bubble is 
wrinkled, and the margin evidencing its once viscous state, and there is the 
remains of a small bubble on the surface, the outer skin of which has 
been removed. 
Fig. 4.—Represents the outside of the bubble, and the rim to which 
the large bubble was attached is well marked, as also the flaking that has 
taken place around this rim. 
All specimens are shown natural size. 
< 
The originals of these figures are in the X T ational Museum, and were 
kindly lent by the Hon. Director, Professor Baldwin Spencer, C.M.G. 
REPORTS ON FOSSILS. 
By Fredk. Chapman , A.L.S., F.R.M.S ., National Museum. 
From Thomson River, Gippsland : Collected by Mr. W. 
Baragwanath, Jun. (Nos. 100 - 103 ). 
Specimens 100 and 101 are from a spur between Little Boy’s Creek and 
Bell’s Creek, Thomson River. They are the two portions of a divided 
block of brown indurated sandstone, showing respectively the internal mould 
and cast of an Orthoceras. This fossil has nearly parallel sides, high 
chambers, slightly oblique septa, and a somewhat eccentric siphuncle. 
There are four chambers in a length of 14mm., near the middle of the 
shell; their width varies from 5 to 5.5mm. in that length. The chambers 
become proportionately higher in the later growth of the shell. The sur¬ 
face-markings appear to be indicated on fragments lining the mould as fine 
vertical lineations. Our specimen appears to be most nearly allied to 
Orthoceras arkonense , Whiteaves, 1 2 from the Hamilton Group of Canada, 
both specimens being characterized by the distance of the septa, together 
with the slender form of the shell and the eccentric siphuncle. Another 
species which has the same type of shell is O. vagans, Salter 3 , occurring in 
the Upper Ordovician (Bala Beds) of Coniston and N. Wales. From the' 
probable existence of longitudinal striae, our specimen, and indeed, the 
typical O. vagans, may prove to belong to the genus Protobactrites of Hyatt. 
The compressed outline in transverse section, and the straight sides, also 
tend to support this view. 
(U Contrib. Canad. Palaeont., Vol. I., pt. V., No. 7, 1898, p. 406, pi. XLVIII., figs. 13, 14, 14rt. 
(2) Salter, in McCoy, Brit. Pal. Toss. 1852 (Appendix), p. VI. pi. 1 L , figs. 28, 29. 
