ARENICOLA, 225 
foreign particles; in A. eraubid and A, antillensis the sacs are closed, 
and contain intrinsic otoliths of lime. 
CI 
- 
LV 
Mase Y 
{1 
Fic. 117.—Dissection of lob-worm from dorsal surface. 
m., Opening of retracted buccal cavity; @., gullet; g/’., diverticula 
on first diaphragm ; g?’., oesophageal glands; d@., dorsal blood 
vessels ; ef1., first efferent branchial; g., stomach intestine ; 75., 
sixth nephridium; ¢/13., thirteenth efferent branchial; @/!%., 
thirteenth afferent branchial; @., anus; a@/1., first afferent 
branchial; %., heart of left side. 
15 
