Plate VI. 



Fig. 81. — Arm-apparatus and body proper of a larva of the 6 p.c. stage, 



dorsal view (from a stained preparation), x 220. 

 Fig. 82. — Body proper of a larva of the 6 p.c. stage, ventral view (from 

 a stained preparation), x 500. 



». obi nervus obliquorum. 



-:;:• oedematic swelling of the visceral layer of the mesoblast. 



»*« body wall. 



Crescent-shaped body (colored yellow) seen over the right obi. 



hit enigmatical element in the cœlomic fluid (see p. 50). 



Fig. 83. — Larva of the 7 p. c. stagf, dorsal view (from life), x 110. 

 Fig. 84. — Larva of the 8 p.c. stage, dorsal view (from life), x 110. 

 Fig. 85. — Larva of the 8 p.c. stage, ventral view (from a stained ] »re- 

 paration). In this figure the posterior dorsal liver is not represented, 

 x 140. 

 Fig. 86. — Larva of the 15 p. c. stage, ventral view (from life). The 

 posterior dorsal liver is left out. x 110. cr n . (by mistake marked 

 cr 11 .) a pair of cirri added ventrally. 

 Fig. S7. — Larva of the 12 p.c. stage, dorsal view (from a stained pre- 

 paration), x 119. 

 Fig. 88. — Larva of the 7 p. c. stage, swimming (free hand drawings from 

 life), a. dorsal view ; b. anterior view. 



Fig. 89. — Larva of Discina, ventral view (from life), x 110. 

 Fig. 90, «.—Tentacle, ventral view, x 310. 



b. — Tip of the longest pair of sehe, x 310. 



