The meaning of the letters is the same in all the figures. 



aa 

 ah 



am 



bl 



bp 



cc 



d 



e 



f 

 ft 

 ga 



gb 



gk 



gn 



(jo 



gp 

 gy 

 h 



a 



ks 



i 



Oral opening. 



Buccal ribs (perradial). 



Oral margin. 



Lobe pouches (arm pouches). 



Perradial gastral pouches. 



Circular canal. 



Endoderm. 



Exumbrella. 



Gastral filaments. 



Taeniola (interradial gelatinous ridges). 



Oral stomach (oral tube). 



Basal stomach (peduncle canal). 



Palatine nodes (perradial). 



Niches of the basal stomach. 



Gastral openings (perradial). 



Palatine opening (porta palatina). 



Pyloric opening (porta pylorica). 



Umbrella cavity. 



Interradial funnel cavities. 



Cathammal septa (interradial fused 



ridges). 

 Marginal lobes (arms). 



md' Perradial deltoid muscles. 



md" Interradial deltoid muscles. 



ma" Bending muscles of the arms. 



mm' Perradial marginal muscles. 



mm" Interradial marginal muscles. 



nt Urticating knobs of the tentacles (stalked 



sucking cups). 



p Umbrella peduncle. 



pb Adherent caudal disc (base of the 



peduncle). 



q Ectoderm. 



g Genitalia (ovaries). 



sb Sacs of the ovaries. 



sk Follicles of the ovarial sacs. 



so Ova. 



tf Bunches of tentacles. 



ug Gelatinous substance of the umbrella. 



um Umbrella margin. 



vj Subumbrella. 



wr Mesogonia (perradial mesenteric folds), 



s Supporting plate (fulcral lamella). 



Fig. 1. — The entire Medusa, in interradial profile view, the natural size. 



Fig. 2. — Interradial section through the entire Medusa, one and a half times the natural size. 



Fig. 3. — Perradial section through the entire Medusa, one and a half times the natural size. 



Fig. 4. — Subumbral view of the entire Medusa (from below), the natural size. 



Fig. 5. — Horizontal transverse section through the distal part of the body at the height of the line 



CH (fig. 3), natural size- 

 Fig. 6. — Horizontal transverse section through the middle part of the body (through the palatine 



opening), at the height of the line EF (fig. 3), natural size. 



Fig. 7. — Horizontal transverse section through the proximal part of the body (through the gastral 

 openings) at the height of the line CD (fig. 3), natural size. 



Fig. 8. — The adherent caudal disc of the umbrella peduncle seen from above (from the ectodermal 

 surface of adhesion), with four interradial furrows and with irregular swellings, four times the 

 natural size. 



Fig. 9. — The oral opening with the four slightly developed oral lobes from below (seen from the 

 oral surface) four times the natural size. 



Fig. 10. — A saculus of the ovarium, composed of numerous follicles separated by fulcral sheaths, 

 seventy times the natural size. 



Fig. 11. — A folliculus of the ovarium, composed of endodermal germinal epithelium and numerous 

 ova, enclosed in a fulcral sheath, 300 times the natural size. 



Fig. 12. — A pair of arms with their interradial deltoid muscles and the cathammal septal ridges, 

 four times the natural size. 



