Plate 19. 



Ppyaiitlia smaragdina, sp. nov. 

 Fig. 1. Eudimeiitary tentacle, connected with otoporpa (per) replacing an otocyst on the 



bell margin ; (en) endodermio core of tentacle, x 300. 

 Fig. 2. Oral view of a segment of the disc of the type specimen showing conformation of 



the gonads, and canal system, x 2. 

 Fig. 3. Otocyst containing five otoliths (ol), and otoporpa (per). X 300. (n) nematocyst. 

 Fig. 4. Optical section of tentacle to show core of chordate endoderni cells (en) ; (ec) 



ectoderm, x 15. 

 Fig. 5. Aboral (outer) view of three marginal lappets of the smaller specimen, showing 



parasitic larvae, in polyp and medusa stages, lying in the gastric cavity and 



in the peripheral canal system of the parent-host, x 6. 

 Fig. 6. Dissection of bell showing endodermic tentacle root (en.r); gonad (go); perona 



(per); (t) tentacle. 

 Fig. 7. Radial section in plane of a gonad in the mature specimen, to show the gelatinous 



genital prominence (g.pr) which supports tlie gonad (go); (c.c) lumen of 



circular canal ; (v) velum. From a dissection, x 8. 

 Fig. 8. Otocyst in optical section; (ol) otolith; (ec) ectoderm; (en) endodermio 



core. X 300. 

 Fig. 9. Radial section of the immature specimen. There is neither genital prominence 



nor gonad; (g) mesogloen : (o.c) circular canal ; (v) velum, x 8. 



