Cy Cg 
GEO. 
Cialrr 
ihe Tiss 
Tis Jor 
. Periphery of the genital zone. 
eel Dy sae in cae. Ges pO Ra 
IIEXARHIZITES INSIGNIS (p. 86). 
Natural size, from a photograph. (After Haeckel). 
». Mouth seam. 
. Three-sided pyramidal point at the end of the mouth seam. 
»» Open remainder of the mouth orifice, not quite obliterated (?). 
. End of the side limb of the mouth seam a, b. 
Inner point of the perradial brachial area (point of bifurcation of the 6 arm seams). 
External ends of the 12 branches of the arm seams (corners of the 12-sided mid-field). 
Lateral angles of the 6 three-cornered genital cavities. 
Convex center of the ground line of the 6 three-cornered genital cavities. 
Inner periphery or rounded point of the 6 genital cavities (subgenital lids). 
. Periphery of the smooth zone (ring canal). 
. Peripheral portion of the 6 perradial canals. 
. Peripheral portion of the 6 interradial canals. 
. Marginal depression for the 6 perradial marginal bodies. 
. Marginal depression for the 6 interradial marginal bodies. 
190 
