356
N. BALAERISHNAN NAIR AND M. SARASWATRY
FIG. 8. Teredo nmegica ( =Nototeredo norvagica). Top, shells showing variation in size
and shape of the different regions ; bottom, pallets, illustrating variation in shape
of the blade and stalk. (After Nair, 1959.)
mantle is often thick particularly in forms like Kuphus. In Neoteredo,
Bactronophorus and Nausitora, all mangrove or brackish water genera,
the mantle is comparatively thicker than in other genera (Turner, 1966 ;
Saraswathy and Nair, 1971). In cross sections of the animal, the mantle
on either side of the median line in Bankia indica and B . gouldi shows
two prominent longitudinal thickenings. In Nausitora hedleyi the
N. BALAERISHNAN NAIR AND M. SARASWATRY
FIG. 8. Teredo nmegica ( =Nototeredo norvagica). Top, shells showing variation in size
and shape of the different regions ; bottom, pallets, illustrating variation in shape
of the blade and stalk. (After Nair, 1959.)
mantle is often thick particularly in forms like Kuphus. In Neoteredo,
Bactronophorus and Nausitora, all mangrove or brackish water genera,
the mantle is comparatively thicker than in other genera (Turner, 1966 ;
Saraswathy and Nair, 1971). In cross sections of the animal, the mantle
on either side of the median line in Bankia indica and B . gouldi shows
two prominent longitudinal thickenings. In Nausitora hedleyi the