122 
MOLLUSCA. 
Daidema, Rans. 
Where the tubular portion is almost spherical, and which has but 
two small valves almost hidden in the membrane which closes the 
operculum. The opercular valves would not effectually closes the 
orifice without the membrane which unites them. 
They also live on the Balasnae, and Otiones are frequently observed 
attached to their surface *. 
Lepas diadema, Chemn., VIII, xci.x, 843, 844. 
