Nematopyton in the N. Y. Museum.—Prosser. 377 
be identical. ‘This view would seem to gain support from the 
facts recited in your notes, which at any rate show how diffi- 
cult it is to accurately identify fossil plants when they pre- 
sent different conditions of preservation involving an extend- 
ed obliteration of structure. 
The differences exhibited by the various specimens of the 
New York plant examined by me, are such as might well 
occur between the stipe on the one hand and the hapteres on 
the other. Replying to your question ‘Is N. crassum now 
considered a synonym of N. Logani’. I may say that I have 
never formally accepted this view, though such may eventually 
be found to be correct; and in view of all the circumstan- 
ces of the present case, I should be inclined to designate the 
N. Y. specimen as N. crassint according to the first deter- 
mination, reserving its exact identity with N. Logan until 
further evidence is obtained, es I do not believe in changing 
names, or in combining possible species once determined as 
such, unless 1e evidence is very good.’’* 
TOURMALINE CONTACT ZONES NEAR 
ALEXANDRIA BAY,N. Y.+ 
By C. H. SMYTH, Jr., Clinton, N. Y. 
The north-west end of Wellesley island, St. Lawrence river, 
is made up of two formations, the older of sedimentary, the 
younger of igneous, origin. Both formations have been meta- 
morphosed, but not sufficiently to hide the evidences of their 
origin in a large way, altho their precise delimitation has been 
rendered obscure at many points. 
The older formation comprises a yariety of schists and 
banded gneisses, together with one prominent belt of vitreous 
quartzyte. The last appears, often as a bold ridge, on the 
northwest side of the island, beginning south of Westminster 
park and extending brokenly several miles southward, show- 
ing in quantity on Grindstone island. The rock is white, gray 
or pinkish, consisting of quartz with just enough feldspar and 
mica to show a slight foliation. The strike is about north 45 
degrees east and the dip 80 degrees north. 
* Letter of March 12th, 1902. 
+ Based upon Fiecld-work done for the State Geologist of New York. 
