23. What kinds of fishes have no males _ib._ 24. Fishes which have a stone in the head; those which keep themselves concealed during winter; and those which are not taken in winter, except upon stated days 392 25. Fishes which conceal themselves during the summer; those which are influenced by the stars 396 26. The mullet 397 27. The acipenser 398 28. The lupus, the asellus 399 29. The scarus, the mustela 400 30. The various kinds of mullets, and the sargus that attends them 401 31. Enormous prices of some fish 403 32. That the same kinds are not everywhere equally esteemed 404 33. Gills and scales 405 34. Fishes which have a voice.—Fishes without gills 406 35. Fishes which come on land; the proper time for catching fish _ib._ 36. Classification of fishes, according to the shape of the body 407 37. The fins of fish, and their mode of swimming 408 38. Eels 409 39. The murena _ib._ 40. Various kinds of flat fish 411 41. The echeneis, and its uses in enchantments 412 42. Fishes which change their colour 414 43. Fishes which fly above the water—the sea-swallow—the fish that shines in the night—the horned fish—the sea-dragon 415 44. Fishes which have no blood.—Fishes known as soft fish 416 45. The sæpia, the loligo, the scallop 417 46. The polypus _ib._ 47. The nautilus, or sailing polypus 419 48. The various kinds of polypi; their shrewdness _ib._ 49. The sailing nauplius 422 50. Sea-animals which are enclosed with a crust; the cray-fish 423 51. The various kinds of crabs; the pinnotheres, the sea urchin, cockles, and scallops 424 52. Various kinds of shell-fish 428 53. What numerous appliances of luxury are found in the sea 429 54. Pearls; how they are produced, and where 430 55. How pearls are found 433 56. The various kinds of pearls 434