EiTTEB. — Octacuemus. 



PLATE 3. 



Fig 8. Comparison of tliis with Figure 1, Plate 1, will show at a glance what the 

 dissection is. The visceral mass is here somewhat too large for the 

 size of tlic animal as a whole. 



Fig. 9. Tlie anterior portion of tlie piece cut from the dorsal wall of the branchial 

 sac seen from liie inner surface (see Fig. 3, PI. 2). 



