TRANSACTIONS OF SECTION C. 1033 
3. Some Results of the Crystallographic Study of Danburite. 
By Max Scuuster. 
In studying the characters of the faces and the structure of the Danburite 
crystals found in Switzerland, the author had met with vicinal faces of a peculiar 
kind, for which he proposed the term ‘transitional faces’ (‘Tschermak Min. 
Mittheil.’ vi. 1884, p. 511). Attention was called to the fact that these faces are 
easily affected by those causes which produce an unequal development of faces 
otherwise symmetrically disposed, and an illustration was given of the way in which 
their indices are numerically related to those of the principal faces of the crystal. 
4, American Evidences of Eocene Mammals of the ‘ Plastic Clay’ Period. 
By Sir Ricuarp Owen, K.C.B., F.R.S., F.GS. 
In the year 1843 a fragment of a lower jaw with one entire molar of a mammal 
was dredged up off the Essex coast. A canine tooth of the same was found in a 
well- sinking near Camberwell, in piercing the ‘plastic clay.’ The author had 
described the above as belonging to an animal of the Lophiodont family, and pro- 
posed for it the generic name Coryphodon. Shortly afterwards De Blainville had 
noticed certain fossils as ‘probably Coryphodont,’ but had referred them to 
Lophiodon anthracotherium. Ten years later Professor Hebert had recognised two 
species of Coryphodon in the plastic clay of France. Explorations “by Leidy, 
Marsh, and Hayden, in the Mauvaises Terres of Nebraska had led to the discovery of 
a large hoofed mammal allied to Coryphodon, to which the name T%tanotherium had. 
been given; and Professor Cope has now recognised, from Eyanstown, Wyoming, 
seven species of Coryphodon. From these materials, which have been rendered 
accessible to Huropean paleontologists by the superb volume of reports recently 
issued by the United States Government, the author is enabled to give a general 
description of this family of hoofed mammals of large size, which flourished in 
early eocene times. To the details of this the major part of the paper is 
devoted. 
5. Discovery of Anurous Amphibia in the Jurassic Deposits of America. 
By Professor O. C. Manrsu. 
6. Third Report on the Fossil Phyllopoda of the Paleozoic Rocks. 
See Reports, p. 326. 
7. On the Distribution of Fossil Fishes in the Estuarine Beds of the 
Carboniferous Formation. By Dr. Traquatr. 
8. Some Results of a detailed Survey of the Old Coast-lines near Trondhjem, 
Norway. By Hucu Mutter, L.G.8 
During a short visit to Norway in October 1884, it appeared to the author 
that the best way to help to a solution the vexed questions connected with the 
coast-terracing of Norway was to execute a careful survey of a few square miles of 
some suitable coast region upon a sufficiently large scale. The neighbourhood of 
Trondhjem is remarkably well suited to this purpose. The map “employ ed was 
partly a municipal chart on the scale of 7,555, and partly an enlargement of the 
Ordnance Map. The limit of all the terraces and marine deposits is the famous 
“strand line’ west of the town, a double range of old-coast cliff cut in the rock of 
the mountain side. Its upper line is 580 feet above the sea,‘ and answers 
1 R. Chambers’s measurement of the lower line in 1849 was 522 feet by level and 
staff. To this is added Professor Mohn’s estimate (58 feet) of the interval between 
the two. The latter proves to be excessive. 
