Brachiopoda

A diagram of the left half of an Argiope, which has been bisected in the median plane. 1, the ventral valve; 2, the dorsal valve; 3, the pedicle; 4, the mouth; 5, lip which overhangs the mouth and runs all around the lophophore; 6, tentacles; 7, ovary in dorsal valve; 8, liver diverticula; 9, occlusor muscle; 10, internal opening of left nephridium; 11, external opening of the same; 12, ventral adjustor; 13, divaricator muscle; 14, sub-oesophageal nerve ganglion; 15, the heart; 16, dorsal adjustor muscle.

Downloads