Plate 11. 



Atorella vanhoffeni, sp. nov. 



Fig. 1. Side view of the type specimen, 5 mm. in diameter. The coronal furrow is 

 deeply marked. The color of the gonads is taken from a sketch from life made 

 on board the "Albatross." 



Fig. 2. Aboral view of the same specimen, to show the radial arrangement of the four 

 gonads and phacellae, and the six tentacles. 



Fig. 3. Aboral view of exumbrella surface and base of tentacle, showing triangular 

 endodermal root of the latter (en.r) ; the exumbral nematocyst warts (n) ; and 

 the outlines of the subumbral plates (deeply shaded). X 50. 



Fig. I. Side view of one phacella. x 70. 



Fig. 5. Longitudinal section of the distal portion of a tentacle, showing the terminal 

 nematocyst swelling (n). (en) endodermic core ; (ec) ectoderm, x 125. 



Fig. (i. Rhopalium by transmitted light, x 100. 



Fig. 7. Rhopalium by reflected light ; (oc) otocyst ; (s) covering scale ; (b) bulbus. X 70. 



Fig. 8. Radial section through margin in plane of a rhopalium ; (oc) otocyst ; (s) cover- 

 ing scale ; (en) endoderm ; (ec) thickened ectoderm ; (g) mesogloea. x 200. 



