34 



JOURNAL OF CONCHOLOGY, VOL. 13, NO. 2, Al'RIL, I91O. 



tions of this nature can only be attempted when every character of the 

 animal is put in the scale ; not a single character should be omitted on 

 the plea of its being unimportant. 



When saying so much in favour of the animal, it must not be under- 

 stood that I underrate the work of the conchologist. The study of 

 the shell has occupied the minds and time of a long list of naturalists, 

 who have made the shells of the mollusca, as it were, time-pieces in 

 geology ; what a blank would that science be without the mollusca. 

 For combined with the biological side, it gives us an insight into the 

 physical conditions existing when strata were laid down, and con- 

 chology and malacology thus work side by side. 



Aa 



Ba 



Fig. I. — Shell lobes. A. — Macrochlamys indica Godwin-Austen. 



Viewed from the right side. 

 K3.. — M. fietrosa Hutton, mantle edge removed, showing shell lobes. 

 B. — Pat-vatella fleiiiingi'Pfr., natural size. 



View of right and left side. 

 Ba.— The right shell-lobe and right dorsal lobe, X 3. 

 A'. — Macrochlamys richilaensis Godwin-Austen. 



Right side, shell removed, X 2. 



