Oll tlie conncitivo tissues nml lioily cnvities of the Njemertenn.H. 45 



Fig. 28. Linens cesser. A prp-genital cell of the body cavity, 

 with spirem arrangement of the chromatin, and absence of the nuclear 

 membrane. Dkl. haematoxylin, cochineal. (Homogen, immers., oc. 4.) 



Fig. 29. Linens gesser. Intracapsular connective tissue cell, with 

 nuclei of other cells, from the ventral lobe of the brain, between the 

 outer and inner neurilemma. Del. haematoxylin, eosin. (Homogen, 

 immers., oc. 4.) 



Fig. 30. Lineus gesser. Cross section through the region of the 

 body cavity, in the anterior portion of the oesophageal region. The 

 body cavity ÇB.C) is here situated between the dorsal side of the 

 oesophagus (Oes), and the circular musculature (CM) of the proboscis 

 sheath. Hermann's fluid; Ehrlich's haematoxylin, eosin. (Obj. C, 

 oc. 2.) 



Fig. 31. Tetrastemma vermiculum. Half of a cross section 

 through the proboscis sheath (P.S) and surrounding parts, near the 

 posterior end of the body. The body cavity is filled with the more or 

 less dense intercellular substance {I.S) of the connective tissue; and 

 in this posterior region, the parenchym cells (Par) completely sur- 

 round the proboscis sheath. Ehrlich-Biondi stain. (Homogen, im- 

 mers., oc. 2.) 



Plate 4. 



Fig. 32. AmpJiiporus glutinosus. Cross section through the pos- 

 terior portion of the proboscis sheath, which as well as the dorsal 

 blood vessel (D.V), is situated in the fluid (Fl) of the body cavity. 

 Ehrlich-Biondi stain. (Homogen, immers., oc. 2.) 



Fig. 33. Ämphiporus glut. Half of a cross section through the 

 posterior region of the body. A thick membrane of the connective 

 tissue {Mem) surrounds the intestine (INI^, and encloses the gonads 

 (Gon), lateral nerve chord (N.C) and lateral blood vessel (L.V). The 

 body cavity (B.C) lies without this membrane. Del. haematoxylin, 

 eosin. (Obj. A, oc. 4.) 



Fig. 34. Tetrastemma catenulatum. Cells of the interstitial con- 

 nective tissue of the body epithelium, showing different modes of 

 distribution of the pigment. Del. haematoxylin, eosin. (Homogen, im- 

 mers., oc. 4, tube extended.) 



Fig. 35. Ampliiporus glutinosus. Intracapsular connective tissue 

 cells of the dorsal brain lobe, between the outer and inner neurilemma. 

 Del. haematoxylin, eosin. (Homogen, immers., oc. 4, tube extended.) 



Fig. 36. Ämphiporus glut. Part of cross section through the 

 connective tissue basal (supporting) membrane of the body epithelium. 

 The granular masses, referred to by the letter c. represent cell re- 

 mains. Del. haematoxylin, eosin. (Homogen, immers., oc. 4, tube ex- 

 tended.) 



Fig. 37. Ämphiporus glut. Mesenchym cells in the fluid {Fl) of 

 the body cavity. Del. haematoxj-lin, eosin. (Homogen, immers., oc. 4, 

 tube extended.) 



