of Holothuria tubulosa, [564];

of Elasipoda, [571];

of Pelagothuriida, [572];

in older fossil Pelmatozoa, [583];

in Thecocystis sacculus, [596]

Magosphaera, [89]

Maidenhair tree, spermatozoa of, [38]

Malacogorgia, [334], [357]

Malarial fever produced by Acystosporidae, [103] f.

Mal de Caderas (= falling sickness of cattle), [119]