GLOSSAEY 



Abalone. A name applied to the mollusc Haliotis, or, as it is 



called in Jersey, the "Ormer." 

 Adductor muscle. A muscle passing across from one valve of a 



bivalve to the other, for the purpose of closing the shell (see 



Fig. 4). 

 Arthropod. A segmented invertebrate animal ^^dtli a more or 



less hard external case and jointed limbs (for example, the 



Lobster or an Insect), 

 Baroque. Any pearl of irregular form ; the name includes a large 



range of varieties. 

 Baskets. Brass sieves used in Ceylon for sifting apart pearls of 



different sizes. 

 Blister. A structure sometimes incorrectly termed a pearl, but 



which in reality is nothing but an excrescence of nacre 



attached to the shell. A deposit of nacre round an object 



placed between the shell of a mollusc and the mantle. 

 Blue pearls. Dark coloured pearls of opaque slate-blue colour. 

 Bombay pearls. Pearls chiefly from the oriental pearl oyster 



{Margaritifera vulgaris) which are fished in the Persian Gulf 



and Red 8ea and exported through Bombay. 

 Button pearls. Dome-shaped pearls with one surface almost 



plane. 

 Byssus. The threads secreted by glands in the foot of certain 



shellfish, for attachment to hard bodies or to one another. 



