[2571] Ἱπποὶ. The more common reading is ἱππεῖς, “horsemen.” Cuvier thinks, that in all probability, these are a kind of crab with very long legs, vulgarly known as the sea-spider; the Macropodia and the Leptopodia of Linnæus.
[2572] 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.
[2573] Both in the crab and the cray-fish, Aristotle says.
[2574] Ælian, Hist. Anim. B. vii. c. 24, calls this kind of crab δρομίας, the “runner,” from the great distance it is known to travel. He says, that they meet together, coming in one by one, at a certain bay in the Thracian Bosporus, where those who have arrived wait for the others; and that on finding that the waves of the Euxine are sufficiently violent to sweep them away, they unite in a dense body, and then waiting till the waters have retired, make a passage across the straits.
[2575] Cuvier remarks, that Hardouin is correct in considering this the same as the crab known in France as Bernard the Hermit (our hermit-crab), the Cancer Bernardus of Linnæus, a species of the genus now known as the Pagur. This animal hides its tail and lower extremities in the empty shells of whelks, or other univalves. Cuvier suggests that our author committed a slip of the pen, in using the word oyster here for shell-fish. This is the καρκίνιον, probably, of Aristotle, Hist. Anim. B. v. c. 15, and De Part. Anim. B. iv. c. 8; and it is most probable that, as Cuvier states, the real πιννοτήρης of Aristotle, Hist. Anim. B. iv. c. 4, and B. v. c. 14, was another of the crustacea, of which Pliny speaks under the same name in c. 66. This last is a small crab, that lives in the shells of bivalves, such as mussels, &c., but not when empty. See the Notes to c. [66].
[2576] This circumstance is more fully treated of in B. xxxii. c. 19.
[2577] Our author speaks rather more guardedly here than usual; and Hardouin seems almost inclined to believe the story. Ovid also alludes to this story in the Met. B. xv. l. 370, et seq. “If you take off the bending claws from the crab of the sea-shore, and bury the rest in the earth, a scorpion will come forth from the part so buried, and will threaten with its crooked tail.”
[2578] Of animals covered with a thin crust.
[2579] The sea-urchin, the herisson de mer of the French, and the Echinus of Linnæus.
[2580] Cuvier remarks, that it does not use the spines or prickles for this purpose, but that it moves by means of tentacules, which it projects from between its prickles.