Note 2572 — BOOK IX. THE NATURAL HISTORY OF FISHES.

Hardouin remarks, that Aristotle says this only of the carabi, or cray-fish, and not of the crabs in general; and that, on the contrary, in B. v. c. 7, he says, that in the crab the male does not differ in conformation from the female, except in the opercule. There seems, in reality, to be no foundation for the statement here made by Pliny.