Vol. XI, Nos. 5 & 6.) Pearl Fishery in Palk Bay. 163 
[W.S.] 
extend is uncertain, but if we consider the relative sizes of 
stages I, IT, and III, it is probable that 4 or 5 days separate 
the larger sizes of stages I and II, and a similar period those of 
stages II and III. In such case pearl oyster larvae may 
= cestode larvae (Prosthecobothrium trygonis ?) from cysts in the liver 
°F pearl oysters from Palk Bay. Drawn under slight pressure. 80. 
enaaritijera, Shipley and Hornell, was not uncommon, and 
wal) wt Tetrarhynchids were usually present in the intestine 
» tWo or three in each individual; spherical cestode larvae 
