56 On the Economical Uses of some species of Testacea. 
mals, and birds, and plants from every part of the world—from the 
most contrary climates, and yet all thriving. ‘The quail and the 
turkey from this country, the guinea-fow] from the burning plains of 
Africa, the peacock from Asia, and still more lately the kangaroo 
and emeu from New South Wales ;* and what is to prevent shells 
living and breeding in an element by far less subject to change in 
temperature than the air. The Ostree and Pectines in particular 
might, we feel sure, be successfully transplanted, if proper care were 
~ taken. 
To guess at the causes why this has not been done, were futile ; 
but we may suggest, that it is perhaps owing to the very general 
ignorance on the subject, the employment of fishermen being in- 
ferior and ill paid, and the variations of the ocean throwing difficul- 
ties in the way greater than in the introduction of animals and birds 
on land. The descriptions of the shells have not been arranged 
systematically : but they stand according to their general interest, or 
their artificial connection one with another. It has also been thought 
best to omit all scientific descriptions, as most of the species are well 
known, and are to be met with in all books on Concholo 
The Linnean nomenclature has, with a few exceptions, been fol- 
lowed. 
I. Myrinvus marcaritirervs, (Linn.)— The Pearl Oyster. 
Of all the Testacea, this species is the most valuable, the best 
known, and enters the most largely into the arts. It not only pro- 
* The following are the foreign animals domesticated in England. The origi- 
nal habitats (with the exception of the two last) are given on the authority of 
Jenyns, in his Manual of British vertebrate-animals. From Europe, . Cervus 
ama, Perdiz rubra, Cygnus Olor, Ef a errs, Esox Tau cius{?) From 
Aribas:3 Mintete Sind: Felis mitinicatia, Guninides Mele agris, Anas Mes ypticus, 
Cygnus Guincensts. From North America, Meleagris Gallapavo, Perdix Vir- 
giniana, Cygnus Canadensis.. From South America, Cavia Cobaya. From 
India, Pavo cristatus, Gallus domesticus, G. lanatus, gc. From China, Phasia- 
nus torquatus, Cyprinus auratus. From Australia, Halmaturus siganteus, (iil.) 
Rhea Nove-Hollandie. 
“tIn Sficiods Sa guzine of Natural History, Vol. 1X. pp..572—574, mention is 
made of two shells which have naturalized themselves in Great Britain. The 
one isthe Mytilus polymorphus, (Pallas,) supposed to have been introduced into 
the Thames on timber, and now spread through England and Scotland. The 
