“. Geological News.—SILURIAN AND Devonran.—H. A. 
ë 
t 
1887] a Geology and Paleontology. ; 567 
the other has been obtained. This shows that the teeth de- 
scribed are premolars, and that there are two true molars, which 
resemble those of Polymastodon and Neoplagiaulax. The pre- 
molars are a good deal like those of Plagiaulax, as described to 
me by Professor Osborn, and the question arises whether the 
dentition in question does not belong to Ptilodus. There are 
two reasons for answering this question in the negative. First, 
d 
opposing the peculiar-cutting fourth premolar of the inferior 
series; second, the only tooth which could oppose such an infe- 
rior premolar is the first molar, and this is not worn obliquely, as 
i 
in Plagiaulacide, but transversely, as in Polymastodon. 
the Mesozoic character of the Puerco fauna.—EZ. D. Cope. 
Nich- 
olson describes, in the Annals and Magazine of Natural Hist re 
some new and imperfectly-known Stromatoporide. Four of the 
species of Clathrodictyon occur in the Devonian and one in the 
Silurian of Canada. 
- Bureau has taken casts of some markings upon a mudd 
surface, and found that he had well-characterized Bilobites. Yet 
markings were made by the tail of a shrimp in swimming. 
Mesozoic.—Mr. A. S. Woodward notes the undoubted pres- 
ence of a columella in the skull of Ichthyosaurus, and figures 
the same (P. Z. S., June, 1886). Professor Cope had first given 
a diagrammatic outline of the bone. 
Mr. J. Carter, in a recent communication to the London Geo- 
logical Society, adds fifteen or sixteen species to the fossil Deca- 
poda of Great Britain. These occurred in the Oxford Clay at 
St. Ives. Only one had previously been recorded as British, 
seven were new to science, and nearly all are Macrura. 
TerTIARY.—The fossil Mammalia of Maragha, in Northwest- 
ern Persia, include many species identical with those of Pikermi, 
Greece. The deposit was discovered thirty years ago, and the 
Ae s 
