skull, [231];

pectoral fin, [244];

gills, [285], [286];

lung, [291], [299], [300];

vascular system, [323], [324], [329], [338];

grunting sounds, [363];

brain, [377];

abdominal pores, [401];

Müllerian ducts in the male, [407];

distribution and habits, [508], [512];