INVERTEBEATE ANIMALS. 19 



the whole class has been removed to the Sub- 

 kingdom Vertebrata. 



Group 53.— Class BRACHIOPODA. (Bpocxioov, the arm ; 

 TTovg, a foot. The Lamp-shells possess a true upper and 

 under valve. Estimated number of species : recent, 

 100 ; British, 5 ; fossil, 1,000, from the Silurian 

 upwards. 



IF Examples of nearly all the recent, and of a few 

 of the fossil genera. Lingula is remarkable 

 for having remained almost entirely unchanged 

 from the age of the earliest fossiliferous rocks. 

 Upper Compartment. 

 Animals of Lingula, and other Brachiopoda, in 

 spirits. 



Group 54.— Order RUDISTES (Lamarck). Estimated 



number of species : recent, none known at present ; 



fossil, 100, from the Chalk and Hippurite Limestone. 



\ Examples of Hippurltes ; Specimens of Radiol- 



ites, Caprinella, Caprina, and Caprotiiia, are 



desiderata. 



Province MOLLUSCA. 



MOLLUSCA PROPER. 



The present series of Mollusca was commenced by a gmall hut very 

 useful collection contributed in 1859 by the late Miss Yates, of 

 Liverpool. Some of the desiderata toere 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 ivas 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 Henky and Arthur Adams ; 

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

 tion recorded in tlte tablets. The excellent " Manualofthc Mollusca," 



