I34 2 OYSTERS, AND ALL ABOUT THEM. 



Paris, 271, 691. 



Parkstone Pier, 382. 



Parquers. 512, 592, 613, 632. 



Pasquier, Dr., 316. 



Patagonia, Geology of, 198. 



Patina ostrearum, 283. 



Paul, and de Lamazelle, MM., 554. 



Payrandeau, 173. 



Placental embryo, 196. 



Pearl, Mother of, its colours not dependent upon its chemical constitu- 

 ents, 89 ; can be transferred to balsam of Peru, to gum arable, and 

 to a compound of Mercury and Bismuth, 89 ; or communicated by 

 hammering to a clean surface of lead, 89 ; fineness and number of 

 gi-ooves in shell, 89 ; grooves not obliterated by grinding, and how 

 separated, 89, 90. 



Pecten, ref., 144, 146, 151, 165, 173, 188, 189 ; have over looeyes, 161 ; 

 divided into 28 species, 161 ; ref., (a comb) described, 160, 185, 

 186, 187 ; aculeatus, 183 ; affinity between genus avicula, and, 189; 

 adductor muscle of, 157 ; British species, character of 161 ; 

 Audouinii, not a variety of, compared with the P. lineatus of Da 

 Costa, 1 73 ; the P. submfus of Lurton, not a variety of, 1 73 ; Pecten 

 concentricus, 172 ; their colour supposed to be dependent on the 

 action of solar light, 162 ; difference of opinion on the, 162 ; 

 domesticus, 179 ; fuci, 183 ; Foresti, 185 ; furtimis, 179, 180, 181 ; 

 var. Grcenlandicus, 185 ; Hinnites, proved to be a true species, 164 ; 

 peculiar mode of attachment, 164; var. sub orbicular is, 181 ; 

 habitat, 181 ; Islandicus, abundant in the Arctic Ocean, 168, 169 ; 

 not an inhabitant of our coast, explanation, 169 ; common in fossil 

 state on the Swedish coast, 170; Jacobaeus , 188, 189; common 

 in Mediterranean and Cherbourg ; distinguished from P. malleus, 

 190; laevis, 189; Landsburgi, 183; Maximus, 185, 188, 189, 

 190; described, 185, 186, 187; Habitat, 187 to 190; different 

 names of, in France and England, preferred by some to the 

 oyster, 187 ; a strange idea relative to, entertained by ancient and 

 modern authors, 188 ; distinction between the young of, and those 

 of P. similis, 189 ; length of shell of, 188, 189 ; medicinal purposes 

 as well as for food, 188 ; notions of the fishermen concerning, 188 ; 

 possess no byssus, 189; use by the ancients, 188; where the 



