EXPLANATION OF PLATE XXIX. 
MELO INDICUS. 
Fic. 3.—The animal after removal of shell, from the left side. 
The pericardial roof has been removed. 
,, 4-—The same, from the right side. The branchial roof has 
been cut and turned back. 
Ct., Ctenidium; Osph., Osphradium; R. S. T., Right siphonal tentacle; 
L. S. T., Left siphonal tentacle; S., Siphon; Fore-R., Fore-roof ; Pr., Proboscis ; 
t., Cephalic tentacle (on fore-roof); e., Eye; O., Ovarian tubules; R. L., Right 
lobe (or posterior lobe) of renal organ; L. L., Left lobe (or anterior lobe) of renal 
organ; M. Gl., Mucus gland in branchial roof; U., Excretory aperture; A., 
Anus; ¢., Oviduct, in branchial cavity. 
