68 Scientific Intelligence. 
changed from Sa megalops. Some of the smallest of these speci- 
th 
mens, in carapax is 5°6 o™™ long and 6°1 to 6 
broad, differ fem the adult so much that they might very easily 
be mistaken for a different species e carapax is very slightly 
broader than long and very convex above. The front is broad, 
not narrowed between the bases of the ocular peduncles, and tri- 
angular at the extremity. The margin of the orbit is not trans 
verse but inclines obliquely backward. The ambulatory legs are 
nearly naked, and those of the posterior pair are proportionally 
much smaller than in the adult. 
The adult Ocypoda is ee in its habits, living in deep 
holes phic high water mark on sandy beaches ; — the young 
but they were more Be awaiting the final change to the terres 
trial state. The tufts of pee hairs between the bases of the 
second and third ambulatory legs, and in the adult —— 
ual there had evidently landed and davelepad dasend the sea- 
son. Probably all those living the poor before had perished 
during the winter, and it is possible that this species never sar 
vives long enough to attain its full growth so far north. 
New Haven, June 1, 1873. 
2. Corals and Coral Islands, by J. D. Dana. Reply to the 
criticism of P. Martin Duncan.*—In a criticism of Prof. Dana’s 
work on Corals and Coral Islands, printed in a recent number of 
“ Nature,” i eva vii, p. 119), Mr. ‘Duncan saw fit to mention a 
Conce ming the ves character ae plan of Dana’ i it is 
not my intention to anything, for these = matters 7 
chiefly concern the author and publisher. It is to be pres ; 
that thes know, athe as well as any critic, hes ind of bool de 
“reply” was published in nearly the same form in “Nature,” vol. Vii 
p. ‘os ‘bat the present article was i in type before the publication of the forme 
