28 INVERTEBEATE ANIMALS. 



Section PODOPHTHALMA. ttovs, foot; 6<pQuXix,os, eye. 

 Eyes on foot-stalks. 



Group 80.— Family HALIOTID^ aXjoj, marine, ovg, ear. 

 Estimated number of species : recent, 74 ; British, 1 ; 

 fossil, 4. Miocene. 



Upper Compartment. 

 IT Series of polished HaUotis, including the prin- 

 cipal kinds used in the manufacture of papier- 

 mache articles, card cases, &c. 



Family TROCHID^. 



Group 81.— Sub-Family ASTRALIIN^ and allies. aa-Tpov, 

 a star. Estimated number of species : recent, 200 ; 

 British, 3 ; fossil, 5. Miocene. 



^ Examples of Stomatella, Gena, Stella, Rotella, 

 Guilfordia, Broderipia, Trochiscus, Camitia, 

 Microtis, Scissurella, dc, constituting an 

 assemblage of very beautiful generic forms. 



Group 82.— Sub-Family TROCHINZE. trochus, a hoop. 

 Estimated number of species: recent, 556; British, 16; 

 fossil, 300. Silurian, &c. 



The shells of the Trocliince are found on the 

 coasts of all seas, and exhibit a remarkable 

 variety of form and sculpture. 



Group 83.— Sub-Family TURBININ^ and alHes. turho, 

 a top. Estimated number of species : recent, 110 ; 

 British, 1 ; fossil, 420 (?). Silurian, &c. 



H Specimens of Turho and Phasianella, showing the 

 solid stony operculum characteristic of the group. 



