Plate IV. 



Figs. 1 a and h. Area tennis Tok. 



Fig. 2. Pecten lœtus Gld. 



Fig. 3. Pecten aff. irradians LAi\r. 



Fig. 4. Pecten pulchellimus Tok. 



Figs, i) a. and ù. O.strea, (jigas Thumb. 



Figs, ß a and &. Ostrea clenselameUosa IjKE. 



Figs. 7 a and h. Ostrea irregularis Tok. 



Figs. 8 a and i. Waldheimia grayi Dav. 



Figs. 9 a and />. Wcddhcimia irrec/ularift Tok. 



Fig. 10. Lîngula Juans Swains. 



(All the figures exoeptin^j figs. 4, 9a and 9& are in natural size). 



