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Résumé (in English)............................................69
Species examined ......................69
Integument...............................................7°
Nervous system............................................71
The oesophageal ring, The proboscideal nervous system [p. 71]. The ventral nerve-cord. The peripheric
nerves. The parapodial ganglia [p. 72]. — Histology ot the nervous system (The
neurilemma-sheath [p. 73]. The ganglionic cells (two types, one whose prolongation forms, directly, a nervous
tube of a perepheric nerve, another whose prolongation becomes loosened out into the fibrillar
reticulation of the central mass). The fibrillar mass (in the longitudinal commissures, it consists
of longitudinal and transverse nervous tubes and of a fibrillar reticulation extending throughout the
commissures) [p. 74]. Summary of the results of observations upon the histological structure (general
laws relative to the distribution and course of the cell-prolongations and the nervous tubes) [p. 75]).
The development of the nervous system. Abnormities in the structure and
development of the nervous system.
Sensory organs .............................................. 75
The body-cavity and the connective-tissue ............................7^
Muscular system.............................................7^
Segmental glandulous sacks („Suckers")..................................76
Hook-apparatus .................................................77
Alimentary canal...........................................77
Genital organs............................................................78
Complemental males (Dwarf-males) ...................................79
The hermaphroditism of the Myzostomida .......................79
Systematic position ......................................80
Description of the figures.
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