Plate 17. 



Fig. 1. Aegina alternans, sp. nov., type ; showing the undivided gastric pockets 



interradial in position, and equal in number to the tentacles. X 1.5. 

 Fig. 2. Ounoctantha octonaria. Marginal lappet of half-grown individual showing tht 



well-developed median and rudimentary lateral otocysts (oc), and otoporpae (op) 



X60. 

 Fig. 3. Cunina globosa ; tip of tentacle densely packed with nematocysts (n). 

 Fig. 4. Ounoctantha octonaria ; rudimentary lateral otocyst, in which no otoliths are yel 



formed ; (en) enclodermic core. X 250. 

 Fig. 5. Ounoctantha octonaria ; fully formed median otocyst, containing one large otolith 



(ol) ; (op) otoporpa ; (n) nematocyst. X 250. 

 Fig. 6. Ounoctantha tenella, sp. nov. Margin of one lappet, with three otocysts (oc), 



all well-developed ; (en) endodermic core of tentacle ; (en.r) endodermic root 



of tentacle ; (u.p) nematocyst pad at base of tentacle ; (op) otoporpa. X 30. 

 Fig. 7. Cunoctautha tenella. Otocyst. x 250. 

 Fig. 8. Cunina globosa; otocyst (oc), and otoporpa (op). The shape of the latter is 



characteristic ; (n) nematocyst. x 250. 



