348 



MANUAL OF THE MOLLUSCA. 



Of the recent marine sliell-fish some are in great measure animal 

 feeders, while the rest live on akse and infusoria. 



Animal feeders. 



Cephalopoda... , 193 



Proboscidean Gasteropoda 4,329 



Dentaliadae , 50 



Opistho-branchiata (part) 508 



Nucleobranchiata 44 



Pteropoda 79 



5,200 



Vegetable feeders. 



Gasteropoda rostrifera 3,127 



Opistho-branchiata (part) 128 



Infusorial feeders. 



Bivalve shellfish 3,226 



Tunicaries 1.50 



6,631 



Pulmonifera 4,960 



Recent. Fossil. 



Fre^h-water shells 1^.504 800 



Marineshells 10^2 13,30o 



Land snails 4,626 491 



Total of SheU-hearing Molhisca 16,132 Total 14,591 



Naked MoUusks 660 — 



Total of Recent Molhisca* 16,792 (British 4,-590) 



* The total number of living Fer^e&raife animals amounts to about 10,000; the 

 number of Plants is estimated at 100,000, and the Insect class is supposed to in- 

 clude not less then 300,000 species. 



