NARCOMEDUS^E — CUNINA. 



477 



My studies at Naples lead me to believe that Cunina intrea Gegenbaur is only the young 

 of C. proboscidea. It is distinguished only by its smaller size, narrower stomach-pouches, and 

 flatter, less conical stomach, but all of these change in larger medusae so as to approach the 

 conditions typical of C. proboscidea. 



T7 

 3 n. 3i6. ' 3H. 



Figs. 311 and 312 — Cunina globosa, after Eschscholtz. 



Figs. %W and 314.— Cunina campanulata, after Eschscholtz. 



Fig. ■Cit.-Cunina lativtnirh, after Gegenbaur, in Zeit. fur wissen Zool., Bd. S. 



Fig. lil.-Cunina proboscidea. After Metschnikoff, in Arbeit. Zool. Inst. Wien. 



Metschnikoff, 1886, and Woltereck, 1905, find that amoeboid, "neutral" germ-cells 

 wander out from both the male and female gonads of Cumna proboscidea These amoeboid 

 cells then beain to divide in the entodermal pouches and gelat.nous substance of the sub- 

 umbrella After this process of division these cells fuse with one another, so that one ot the 



3'7- 



Fig. 317 



A. Radial section through a tentacle and its peroniun 



Lobianco. 



Cunina proboscidea. Drawn by the author, from sections of a medusa collected at Naples by Dr. 



B. Radial section through a sense-club and its otoporpa. I 



figures ectodermal nuclei are shown as black dots while entodermal are circles. Cav, indicates the outer extremity 

 of the perradial stomach-pouch, em, the solid cord of entoderm at the bell-margin in the place of the nng-canal 

 which is here absent, m,, entoderm. «, exumbrella. gon, gonad, oc, sensory-club, otp, otoporpa. p, peron.um. su. 

 subumbrella. (, tentacle, o, velum. 

 Fig. v%.-Cunina "vilrea," after Gegenbaur, in Zeit. fur wissen. Zool., Bd. 8 = C. proboscdeaf 



