PLATE VUL 



C. sibogae. 



Figs. 80—89. — Male. 



Figs. 90 — 93. — Neuter. 



Fig. 94. — Common stalk-base. 



Figs. 80 — 89. — Frontal sections of the male shewn in PI. VII, fig. 75. For explanation, see text, p. 86. 



Fig. 80. — ■ Through dorsal lobe of proboscis (/.). The arms [L.a., R.a.) are somewhat macerated. 



Fig. 81. — Through region of pericardium (7 sections later). 



Fig. 82. — The next section. 



Fig. 83. — The next section but one. 



Fig. 84. — Through the mouth (3 sections later). 



Fig. 85. — Two sections later. 



Fig. 86. — Three sections later. 



Fig. 87. — Three sections later. 



Fig. 88. — Two sections later. 



Fig. 89. — Forty four sections later. 



Figs. 90, 91. — Frontal sections of a neuter. 



Fig. 90. — Through the entire length of the right gill-slit [g.s.]: — //., pleurochordal tissue of groeve 

 continuous with the left gill-slit and the left pleurochord. 



Fig. 91. — Five sections nearer the stalk, cutting both pleurochords (//.). 



Fig. 92. — Obliquely frontal section of another neuter, cutting the posterior end of the ventral side of 

 the collar. The arms of this specimen are shewn in PI. IX, fig. 97. 



F^S- 93- — Obliquely frontal section of the anterior end of a neuter. The left arms have been breken 

 efif, a torn place in the section marked L.a. indicating part of their base. The section shews the 

 streng muscles [ms) of the metasome inserted into septum "/j, from which starts ene of the 

 origins ef the large eral muscle (or.m.). The wall of the gill-slit {g.s.) is composed of pleurochordal 

 tissue. The ventral epithelium of the collar-canal {c. c.) is strengly ciliated. The preblematical tissue 

 (,r.) ef the collar-canal has a distinct row of nuclei en its coelomic border, while a band of muscle 

 passes from it across the collar-cavity te the basement-membrane of the epidermis. 



Fig. 94. • — Common-base ef stalks, in vertical section. 



[Fig. 5)^ tuds drazun ivith Zeiss DD Obj.; So — g^ ivitli C Obj. None of the drawings have been reduced\. 



