INVERTEBEATE ANIMALS. 19 



Province MOLLUSC A. 



MOLLUSCA PROPER. 



The series of Mollusca was commenced by a small hut very useful 

 collection, presented in 1859 hy the late Miss Yates, of Liverpool. 

 Some of the desiderata were supplied at the same time by H. H. H. ; 

 others from time to time have been acquired by purchase, especially 

 at the sale of the Dennison Collection, in 1863. A very fine 

 collection of choice Shells was in 1868 presented to the Museum, by 

 Samuel Smith, Esq., Banker, of Liverpool. 



The Recent Species have been named and arranged in accordance with 

 "The Genera of Recent Mollusca,'' by Henkt and Aethue Adams: 

 from the same prolific soiirce has been derived much of the informa- 

 tion recorded in the tablets. The excellent "Manual of the Mollusca,'' 

 by the late S. P. Woodwaed, and the "Manuel de Conchyliologie," 

 by M. Chenu, have been followed in arranging the fossil illustra- 

 tions. Of the 1390 Generic and Sub-Generic forms recognised in 

 the " Genera of Recent Mollusca," the collection at present contains 

 illustrations of about 1121. The "History of British Mollusca and 

 their Shells," by Edward Foebes and S. Hanley, has been used in 

 naming and arranging the British representatives in the 78 groups 

 assigned to the Mollusca Proper. 



Class LAMELLIBRANCHIATA. lamina, a 

 plate ; ^pocyx^a, the gills of fish. = CONCHIFERA 

 (Lamarck). Bivalve Mollusca, 

 Section ASIPHONIDA. «, without; <ni;>xv, a tube. 



The absence of a respiratory siphon indicates, generally, that the 

 species do not live immersed in sand or mud. 



Group 55.— Family OSTR^ID^ and allies. Oyster. 

 Estimated number of species : recent, 182 ; British, 5 ; 

 fossil, 200. Carboniferous, &c. 



IT Examples of Ostrea, Anomia, Plicatula, Spon- 

 dylus, Placunanoviia. 



Upper Compartment. 

 Placenta orbicularis, used for windows in some 

 parts of China ; Group of Pedum in coral of 

 the genus Porites. 



