Gyri cerebrales, [119]

Gyropus, [350]

Haase on abdominal appendages, [189], [192]

Haemocoele, [22], [23]

Hagen, on segments, [88];

on wing-rudiments, [395];

on respiration of immature dragon-fly, [423] f.;

on larvae of Ascalaphides, [460];

on amber Psocidae, [397];

on Platephemera, [428];