Plate 45. 



Fig. 1. Pegantha triloba, exumbral view of a marginal lappet, showing form and 



extent of otoporpae (otp), and position of otocysts (otc) ; (v) velum ; (per) 



perona. X 8. 

 Pig. 2. Pegantha triloba, dissection of gonad, showing the sexual lobes (go) supported 



by the gelatinous genital prominence (g-pr). X 10. 

 Fig. 3. Cunina peregrina, sp. nov.(?) Stolon, taken from bell of a Ehopalonema velatum. 



X 30. 

 Pig. 4. Young medusa just liberated from above stolon, showing long manubrium (mn), 



rudimentary tentacles (t), and otocysts (otc). X 50. 

 Fig. 5. Oral view of somewhat older medusa, from the same stolon, in which there are 



eight tentacles and well-developed otoporpae; (otc) otocyst; (mn) manubrium. 



X 60. 

 Fig. 6. Side view of same medusa, from a photograph, showing otocysts (otc); manu- 



brium (mn) ; velum (v); tentacles; and outline of gastric cavity. 

 Fig. 7. Two marginal lappets of same specimen, showing otoporpae (otp), and otocysts 



(otc). There is no visible indication of a peripheral canal system (v), velum. 

 Fig. 8. Cunina peregrina, sp. nov., otocyst; (otl) otolith ; (otp) otoporpa. X 250. 

 Fig. 9. Crossota brunnea, oral view of apex of bell, showing the long manubrium (ran), 



gonads (go) hanging from the radial canals (era) into the bell cavity, and the 



muscular condition of the subumbrella. X 5. 

 Fig. 10. Amphogona apsteini, otocyst; (en) endodermic core ; (otl) otolith, x 100. 

 Fig. 11. Rhopalonema velatum ; one octant of bell margin, showing arrangement of mar- 

 ginal organs; (t.ra) radial tentacle ; (otc) otocyst. X about 25. 

 Fig. 12. Colobonema sericeum ; one octant of bell margin, showing the relative sizes of 



radial (t.ra), adradial, and interradial tentacles, muscular condition of the 



subumbrella, and extent of the gonads (go). From a photograph. X 4. 

 Fig. 13. Halitrephes maasi, gen. nov., sp. nov. Portion of the bell margin of type 



specimen, showing relation of radial canals (era), tentacles, and otocysts 



(otcV 



