on the tongue, [118];

vibrating tails, [177];

burrowing forms, [188];

a mistake of Schlegel, [209];

fresh-water ss., [222], [224];

sea-ss., [235], [237], [240];

a semi-pelagic s., [243];

the epidermis, [315];

names of head-shields, [316];

illus. ib., [318];