115 
Geological Society. 
the Crags, and four of them new to science. A remarkable low- 
crowned, but broad, lower carnassial tooth from the Norwich Crag of 
Bramerton is referred to the genus Lutra , and named specifically 
L. Reevei. All the other specimens noticed below are from the 
nodule-bed at the base of the Suffolk Bed Crag, and the first 
four of them are in the possession of Mr. E. C. Moor, of Great 
Bealings. A right ramus of a lutrine lower jaw, differing from 
the common Otter in having the hinder fangs of the premolars 
much larger than the front ones, and agreeing in this particular 
with the Lutra dubia of DeBlainville, is referred to the latter 
species. A humerus of a Seat, most nearly resembling that of 
Phoca vitulina , but of smaller size and more slender proportions, is 
called Phoca Moori . Another Seal’s humerus, having a peculiarly 
triangular shaft, is thought to belong to the Phocanella minor of 
Van Beneden. A maxilla with three teeth, evidently belonging to 
the genus Trogontherium , but of smaller size than the Trogontherium 
Cuvieri , is believed to represent another species, and is named 
T. minor . The ziphioid rostrum in the Ipswich Museum, which 
received from the Bev. H. Canham the MS. name of Mesoplodon 
Floweri , is for the first time described ; and another rostrum in the 
.Museum of Practical Geology, characterized by being very short 
and with a deep boat-like anterior extremity, is named Mesoplodon 
scaphoides. The peculiar species Ailurus anglicus , hitherto known 
only by a piece of a lower jaw with a carnassial tooth, is now 
further illustrated by a fine upper molar recently presented to the 
Museum of Practical Geology. 
2. “ On Burrows and Tracks of Invertebrate Animals in Palaeozoic 
Bocks, and other Markings.” By Sir J. William Dawson, LL.D., 
E.B.S., E.G.S. 
This paper, which is illustrated by photographs and drawings, 
indicates some new facts in connexion with the markings pro- 
duced by the burrows and tracks of animals and by other causes. 
Rusichnites and Cruziana are regarded, like Glimactichnites and 
Protichnites , as representing probable burrows of Crustaceans and 
Chsetopod worms. Scolithus canadensis is shown to he a cylindrical 
burrow, with accumulations of earthy castings at its mouth. The 
relation of these burrows to the forms known as Scotolithus , Astcro- 
jphycus , Monocrater ion, and Astropolithon is pointed out. 
Under the new generic name of Sahellarites the Author describes 
certain tubes, composed of shelly and other fragments cemented by 
organic matter, found in the Trenton Black-river Limestone. They 
resemble the burrows or tubes formerly described by the Author 
from the Hastings and Quebec Groups, and appear to be the tubes 
of worms allied to the recent Sabellarice ; but they are liable to be 
mistaken for Algse of the genera Palceophycus and Buthotrephis. 
Some large cylindrical bodies from the Potsdam Sandstone are 
described as having been supposed to be trunks of trees ; but the 
Author regards them as probably concretions formed around slender 
