I33 2 OYSTERS, AND ALL ABOUT THEM. 



Ovary, form assumed by the young, before quitting the, 100; of the 

 anomia, 142; of the nivea, 167. 



Overdredging in Brest, 504, 505, 536, 537; Cancale Bay, 481,482; 

 Mareunes, 481 ; Netherlands, 697 ; Oleron, 482 ; Rochefort, 481 ; 

 Rochelle, 481 ; Spain, 693; St. Brieuc, 481, 503; Toulon, 672; 

 Treguier, 504 ; of the banks of the Sea of Morbihan, 553. 



Oviparous animals, 101. 



Ovoviviparous animals, 101. 



Ovule, 110. 



Ovum (ref.) 109, no, 615 ; formation of, 615 ; of Angulata provided 

 with a micropyle at the end of the pedicule, 625 ; of the measure- 

 ment of, in diameter and volume, 626 ; of the Dackar oyster, 

 diameter measurement of the, 626 ; of the ordinary oyster, diameter 

 measurement of the, 626 ; of the Toulon oyster, diameter measure- 

 ment of the, 626; transformation of the, 625. 



Oxygen, 77, 135 (acid, to generate.) A colourless, inodorous, tasteless 

 gas, constituting one fifth of the atmosphere, and the supporter 

 of life and ordinary combustion. 



Oyster Abroad, 270; Act, 1869 (No. 2) cited 457 ; age of, at which 

 reproduction begins, 118; age of the adult, 109, 156; alternation 

 of the sexes, no, 113; " ambulances," 123; and Mussel Fishery 

 Act, 1866, 391 ; confirmation, 391 ; American, 109, 113 ; antiquity 

 of, as an article of food, 191 ; appearance and habits of, Professor 

 Eyton, 155; aptitude of the captive to produce spat capable of 

 development, 578, 579 ; asserted to have two adductor muscles, 

 156; At Home, 254; at what age a saleable commodity for mar- 

 ket, 118; for fattening, 119; at what age both ripe for sale and 

 reproduction, 119; a river, 67; auricle of the, 74; boats, descrip- 

 tion of a fleet of, 264, 265 ; body of the, 72 ; branchial fringe of, 

 81 ; blending of fresh and salt water, most advantageous for fattening, 

 &c., 602, 603 ; calcareous secretion by, 86 ; can it see, 82 ; capable 

 of reproducing itself on suitable oyster banks, 510; captivity of, 

 does not lessen its generative powers, 564 ; Catcher, The, 234, 238 

 cilia of, explained, 77, 81 ; circumference explained, 91 ; colour of, 

 74; conditions of its existence of an extremely complicated charac- 

 ter, 124 ; Admiralty or Water Courts held for, 56 ; described, 77 ; 

 different names of, 63 ; Dioecious, 103 ; Dredging, description of, 

 265, 266, 267 ; Eater, The first, 308, 309, 310, 343 ; Dr. Gastaldi. 



