Association of American G'eologists and Naturalists. 335 
Resolved, That Dr. J. D. Whelpley, Prof. H. D. Rogers and 
B. Silliman, Jr., be a committee to report on the intrusive trap of 
New Jersey and Connecticut. 
Mr. Dana exhibited a few drawings by himself, illustrating 
the metamorphosis of the Anatifa. The young of the common 
barnacle was first noticed and figured by Thomson, who remark- 
ed its close resemblance to the species of the Cypris family among 
Crustacea. ‘These drawings show the same with regard to the 
Anatifa, and prove also that the pedicle in the Anatifa corres- 
ponds with the anterior legs, (properly a pair of antenne, ) of the 
young Cypris-shaped animal. In the young state it swims free 
in the ocean and has a pair of compound eyes. .The eyes disap- 
pear when changing to the adult form; in this state the Ana- 
tifa is a fixed animal, like the barnacle, and has no further use 
for eyes. One of the drawings represents the young free ani- 
mal; a second, the same attached by its anterior legs, which ter- 
minate in a disk to the sea-weed, and a third, the full developed 
Anatifa, with the valves of the shell of the young, (the exuvie, ) 
loosely adhering to the foot of the pedicle. 
The propriety of uniting these animals with the order Crusta- 
cea, has been often suggested. 'The structure of the mouth and 
legs, and the fact that they change their skin from time to time, 
like the species of this order, would alone seem sufficient to au- 
thorize this union; but now after the discovery by Thomson 
and others respecting the young, there is no reason for farther 
hesitation. 
Dr. L. C. Beck read a paper on the occurrence of bituminous 
or organic matter in several of the New York limestones and 
sandstones. gee 
In this paper the author stated that in almost all the New York water 
limestones which he had analyzed, the residuum left, after the action 
of dilute muriatic acid, when subjeeted to heat, gave out a bituminous 
or peaty odor. In some cases the proportion of this matter could be 
determined by first carefully drying the whole insoluble residuum, as- 
certaining its weight, and then subjecting it to a red heat and noting 
the loss. In other instances, however, while the bituminous odor was 
sufficiently evident, the loss of weight was scarcely appreciable. The 
same fact was observed in the limestone from Rochester, and generally 
in those limestones termed fetid. ‘The sandstones at Laona and else- 
where in Chatauque County are often so highly impregnated with this 
or a like substanee that specimens, even though kept for some time, 
