Fig. 8. — The entire Medusa, natural size, opened by a perradial longitudinal section and spread 

 flat out. The oesophagus or buccal stomach (ga) is removed in the left third of the figure, is 

 opened and flattened in the middle third, and retroverted upwards in the right third. A perradial 

 buccal pouch of the oesophagus (from inside lb), and also an interradial buccal column {ac) with its 

 adradial wings (ad) and oral filaments («/) are visible below in the middle. The buccal glands (ag) 

 shine through on the subumbral surface of the retroverted buccal stomach. The middle of the figures 

 gives a complete view of the three sections of the stomach. The central stomach (gc) is separated by 

 the pyloric opening (pylorus gy) from the basal stomach, by the palatine opening (palatum gp) from 

 the buccal stomach. The upper third of the principal intestine, the basal stomach (gb) forces itself 

 through the narrow apical canal (cb) as far as the point of the umbrella cone, and is divided by 

 four interradial conical funnel cavities (ib) into four peripheric niches (gn). The entire length of the 

 margins of the niches are bordered by four pairs of diverging phacelli (or rows of filaments, fb). The 

 central stomach (gc) communicates witli the surrounding upper half of the large coronal sinus (cs') by 

 four fissure-shaped perradial gastral openings (go). The eight phacelli (fg) edge the entire length of 

 the margins of the gastral ostia up to the palatine groove (gd). The delicate quadrangular obelisk 

 plates ((/z) lie between the phacelli. The entire extent of the subumbrella (w) is visible in the left 

 third of the figure, but only its distal halves in the right third. The eight testes (gin), which be in the 

 subumbral wall of the coronal sinus (cs) form four pairs, separated by the four perradial gastral 

 openings in their upper half (go), by the four palatine nodes (gk) in their middle, and by the four 

 perradial deltoid muscles (md') in their lower half. The two testes of each pair, on the other hand, 

 are only separated by the four narrow interradial intergenital nmscles (ms) in their upper half, by the 

 four septal nodes (kn) in their middle, and by the four interradial deltoid muscles (md") in their lower 

 half. — The broad subumbral coronal muscle (mc) is divided by sixteen subradial fused clasps (kl) 

 into sixteen coronal plates. Its upper proximal margin (toCj) forms at the same time the lower 

 boundary of the large coronal sinus. Its lower (distal) margin (wie 4 ) forms sixteen subradial 

 scallops, which are inserted at the fused clasps. The concave incisions between them form small 

 funnel cavities, from which the tentacles spring out. Of the twelve tentacles, four are perradial (tp) 

 eight adradial (to) ; the four sense clubs lie interradially. The sixteen subradial marginal lobes lie 

 between them. 



Figs. 9-11. — Three different views of the oesophagus or buccal stomach (proboscis), natural 

 size. Fig. 9. Interradial view from outside. Fig. 10. Perradial view from inside. Fig. 11. 

 Perradial longitudinal section, from inside. The letters have the same meaning throughout, of Oral 

 filaments, am Oral margin, ac Interradial oral pillars ; ad their adradial wings, bb Buccal pouches. 

 ag Glands of the buccal pouches (in several longitudinal rows), ae Perradial buccal fissures, io 

 Subumbral oral funnels (ectodermal interradial niches at the base of the cesophagus). gk Perradial 

 palatine nodes, between the funnels, gd Palatine grooves on their axial surface, t Lowest gastral 

 filament, go Gastral openings, md" Interradial deltoid muscle, gm Spermaria. 



