N.B. — The solid gelatinous mass of the umbrella is coloured blue, the subumbral wall of the 

 umbrella cavity, and the funnel cavities running out from it, violet, and the whole hollow space of 

 the gastrovascular system, yellow. 



The letters have the same meaning in all the figures. 



ac Oral columns (interradial). 



ad Wings of the oral columns (adradial). 



ae Buccal clefts (perradial). 



af Oral filaments (adradial). 



bb Buccal pouches (perradial). 



be Coronal pouches. 



bd Wing pouches (adradial). 



bl Lobe pouches. 



bp Gastral pouches (perradial). 



cb Peduncle canal of the umbrella cone. 



cs Coronal sinus (sinus coronaris). 



ct Tentacle canal. 



d Endoderm. 



ec Coronal furrow of the ex umbrella. 



/ Gastral filaments. 



fb Filaments of the basal stomach. 



fg Filaments of the central stomach. 



go, Buccal stomach. * 



gb Basal stomach. 



gc Central stomach. 



gk Palatine nodes (perradial). 



gn Niches of the basal stomach (perradial). 



go Gastral openings (perradial). 



gp Palatine opening (porta palatina). 



gs Palatine grooves (perradial). 



gy Pyloric opening (porta pylorica). 



gz Obebsc plates of the central stomach. 



h Umbrella cavity. 



i Subumbral funnel cavities. 



ib Basal funnels. 



ii Central funnel. 



Jel Fused clasps of the lobes (peronia). 



kn Catbammal nodes (interradial). 



Ip Selvedge of the marginal lobes (patagium). 



mc Coronal muscle (museums coronaris). 



md Deltoid muscles. 



n Urticating organs. 



or Sense clubs (interradial). 



q Ectoderm. 



sm Testes (four pairs). 



ta Adradial tentacles. 



tp Perradial tentacles. 



ua Adradial tentacles pedalia. 



ug Gelatinous substance of the umbrella. 



ui Interradial pedalia of the sense clubs. 



up Perradial tentacle pedalia, 



w Subumbrella. 



g Supporting plates (fultura). 



Figs. 12-21. — Longitudinal sections and transverse sections three-fourths the natural size 

 (only fig. 21 is ten times the natural size). 



Fig. 12. — Perradial longitudinal section through the entire animal (meridian section of the first 

 order). 



Fig. 13. — Interradial longitudinal section through the entire animal (meridian section of the 

 second order). 



Fig. 14 {AB). — Horizontal transverse section through the basal stomach (at the height of the line 

 AB, figs. 12, 13). 



Fig. 15 {CD). — Horizontal transverse section through the pyloric opening (at the height of the 

 line CD, figs. 12, 13). 



Fig. 16 {EF). — Horizontal transverse section through the central stomach (at the height of the 

 line EF, figs. 12, 13). (Half). 



Fig. 17 (GB). — Horizontal transverse section through the central stomach at the height of the 

 line [GH, figs. 12, 13). (Half). 



Fig. 18 {JK). — Horizontal transverse section through the palatine opening (at the height of 

 the line {JK, figs. 12, 13). 



Fig. 19 {LM). — Horizontal transverse section through the pedal zone of the umbrella, along 

 with the coronal muscle and buccal stomach (at the height of the line LM, figs. 12, 13). 



Fig. 20 {NO). — Part of a horizontal transverse section of the lobe corona (at the height of line 

 NO, figs. 12, 13). 



Fig. 21. — Transverse section through a tentacle, ten times the natural size. 



