162 General Netes. [ February, | 
a surplus for export. Prof. Frazer shows that the metal is found 
chiefly as Millerite, encrusting massés of hornblende, which lie in 
the Eozoic gneiss. 
A number of excellent engravings illustrate Prof. Frazer's re- 
port. Of the accompanying sections that exposed on the east 
bank of the Susquehanna river is the most extensive and instruc- 
tive. As published, it represents an extensive anticlinal near the 
mouth of Tocquan creek, which is an important key to the rela- 
tions of the rocks to the north and south of it. We would have 
been glad to have seen on this chart several other explanations of 
rock structure which appeared on the section as originally pre- 
pared by Prof. Frazer, but which were unfortunately omitted in 
publication. Many of the observed dips have also been erased, 
and figures soiabag into the air substituted by the direction of 
the survey. 1e merits of this change are not obvious, since it 
renders incomprehensible what was previously clear to the eye. 
ALLEGED CHANGES IN THE RELATIVE ELEVATION OF LAND AND 
Sra.—The view that the north-eastern coast of North America is 
slowly rising, and Professor Shaler’s estimate of the rate as being 
probably over a foot a century, and perhaps as much as three feet, 
has been negatived by Mr. Henry Mitchell, according to the Amer- 
ican Fournal of Science and Arts, who states in the Coast Survey 
Report for 1877, that the rocks upon our coast, long notorious as 
dangerous to navigation, have not risen since they were first dis- 
covered; while the salt marshes are still as in the time of the 
early explorers at ordinary high-water level, He claims that no 
tilt in either direction has taken place in the Gulf of Maine. But 
east of long. 64° 13’, ‘and Latest in Newfoundland, great 
changes present themselves in the comparison of charts, the 
depths appearing to be at some ante less and at other points 
greater now than formerly.” 
CATALOGUE OF VERTEBRATA OF THE PERMIAN FORMATION OF THE 
UNITED STATES 
PISCES. 
CROSSOPTERYGIA. 
EcTOSTEORHACHIS es. tie: ei No. 32, 1880, p. 19. 
1. £. nitidus Cope; Tex 
DIPNOI. 
siege Agass. 
C. fossatus Cope; Proc. = Phil. Soc. 1877, Ps 54. Eastern Illinois. 
: c gurleianus Cope; 1. + Pp. 55. Eastern Illinoi 
4. C. periprion Cope ; Proe. ‘Amer. Phil. Soc. 1878, p 527. Texas. 
: rrectus Cope ; 
6. C. dialophus Cope; 1. c. p. 528. Tex 
usillus Cope; Proc. ‘Amer. Phil. Soc. 1877, p. 191. Eastern Illinois. 
Prvoxsb0s prune: Proceed. Amer. Philos. Soc, 1877, p. 192. 
8. ii Cope; Proc. Acad. Philada. 1876, p. 410. Eastern Ili nois. 
9- P. Lane by Cane: Proc. Amer. Phil, Soc, 1877, p. 54. Eastern Illinois. 
