Resume (in F;nglish^ 69 



Species examined 69 



Integument 7° 



Nervous system /i 



The oesophageal ring. The proboscideal nervous system [p. 71]. The ventral nerve-cord. The peripheric 

 nerves. The parapodial ganglia [p- 72]. — Histology of the nervous system (The neurilemma- 

 sheath |p. 73]. The ganglionic cells (two t}'pes, one whose prolongation forms, directl}-, a nervous 

 tube of a perepheric nerve, another whose prolongation becomes loosened out into the librillar 

 reticulation of the central mass). The fibrillar mass (in the longitudinal commissures, it consists 

 ot 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 devel- 

 opment of the nervous system. 



Sensory organs 75 



The body-cavity and the connective-tissue 76 



Muscular system 7^ 



Segmental glandulous sacks („Suckers") 7*J 



Hook-apparatus 'i'] 



Alimentary canal "]"] 



Genital organs 78 



Complemental males (Dv/art-males) 79 



The hermaphroditism of the Myzostomida 79 



Systematic position 80 



Description of the figures. 



