

THE TEETH OF SNAILS. 



277 



All our species are vegetable feeders and are 

 common on rocks, between tide marks, on the 

 Bombay beaches. 



Some of the Ehiji>ido(/loi;sa possess jaws. 



(<j) Docoglossa (Jo/co9=beam). 



Example : Melcioniscns aster, Reeve, familv 

 PateUida' (the "limpets"). The radute of the 

 limpets are of great lengih, that of Melcioniscns, 

 when stretched out straight, is mnch longer than 

 the body of the animal. A few rows are shown 

 in fig. 14. The formula may perhaps be written 

 as3. 1.(1.0. 1.) 1. 3. where the outer figures 

 denote some obscure plates not shown in the 

 drawing and the inner figures denote a pair of 



identical centrals. 



I^g. 14. 



4. Order Amphineura. 



Example: Chiton lurmanus, Carpenter (fig. 15). llie Chitonidct 

 are creatures, with the habits of limpets, protected by a compound 

 shell of eight overlapping plates connected by a leatiiery margin. 

 When det-ached from the rock they have the power of foiling them.- 

 selves up like a woodlouse. The ittdula is very large and massi'v'^ 

 compared with the size of the animal and is very complicated in 

 structure compared with the t\*pes we have already examined. 

 Formula for this species may be written 4. 4. 1.4. 4. 



Fig. 15. 



The drawing does not show the first lateral on each side which is 

 rather like the central ; owing to the manner in which the laterals 

 overlap it is very difficult to distinguish them under the microscope 

 and depict them in a drawing. 



C. Cephalopoda. 



The members of this class, Oetojms, Nautilus, d'c, are distinguish- 

 ed by the possession of powerful jaws as well as a small radula. 

 There are no examples in the Society's collection. 



