16. There are two other kinds which dwell in shells, which some persons call nautilus[108] (and nauticus), and others call it the egg of the polypus; its shell is like that of the hollow pecten, and not like that which has its shells close together.[109] This animal generally feeds near the land; when it is thrown upon the shore by the waves, after its shell has fallen off, it cannot escape, and dies upon the land. These animals are small in form, like the bolitæna; and there is another,[110] which inhabits a shell like a snail. This animal never leaves its shell, but remains in it, like the snail, and sometimes stretches out its tentacula. Let thus much be said about the malacia. [108] Argonauta argo. (_Owen._) [109] This is probably the meaning of the passage. Two kinds of pectens were distinguished; the one large, hollow, and of a dark colour, the other broad and sweeter, but harsh. [110] Nautilus Pompilius (_Owen._) CHAPTER II. 1. Of the malocostraca, there is one genus, of carabi,[111] and another, very like it, of astaci;[112] these differ from the carabi, which have no claws, and in some other respects. There is a third genus, of carides,[113] and a fourth, of carcini.[114] There are more genera of carides, and of carcini; for among the carides are the cyphæ,[115] the crangon,[116] and a small species, for these never grow large. [111] Palinurus, spiny lobster (Bell's crustacea). [112] Lobster. [113] Prawns. [114] Crabs. [115] Shrimp. [116] Perhaps Prawn. 2. The family of carcini is more various, and not so easily enumerated; the largest genus is that called maia,[117] the next to this the pagurus,[118] and the Heracleot carcini; and, again, those that live in rivers. The other genera are small, and have not received any name. On the Phenician coast there are some that they call horsemen, because they run so fast that it is difficult to catch them, and when opened, they are empty, because they have no pasture. There is another small genus like carcini, but in shape they resemble astaci. [117] Perhaps Maia squinado. [118] Cancer paguras, Great crab. 3. All these creatures, as I observed before, have their hard and shelly coats on the outsides of their bodies in the place of skin, the fleshy part is internal. Their under parts resemble plates, upon which the females deposit their ova; the carabi have five feet on each side, including the claws; the carcini, also, have in all ten feet, including the claws, which are last. Of the carides, the cypha have five on each side; those near the head are sharp, and five others on each side of the stomach have flat extremities; they have no plates upon the under part of their body; those on the upper part are like the carabi.