Fig. 13. — Horizontal transverse section through the umbrella peduncle above the adherent caudal 

 disk (at the height of the line AB, fig. 3), twenty times the natural size, gb Basal stomach (central 

 peduncle canal), gn Peripheric niches of the basal stomach, ug Gelatinous wall of the umbrella 

 peduncle, vf Elastic fibres in the gelatinous wall, q Ectodermal epithelium of the exumbrella. d 

 Endodermal epithelium of the basal stomach, ft The four interradial tamiola (or gelatinous longi- 

 tudinal ridges of basal stomach), z Gelatinous plate of the tseniola. m Longitudinal muscles of the 

 peduncle, ed The four interradial longitudinal furrows of the peduncle (on the exumbral side of 

 the Ueniola). 



Fig. 14. — Horizontal transverse section through a tseniolum (or a longitudinal muscular gelatinous 

 ridge of the umbrella peduncle), eighty times the natural size (comp. fig. 13). d Endoderm of the 

 basal stomach, ft Gelatinous substance of the taeniolum. m Longitudinal muscular fibres, distributed 

 in dendritically branched folds of the gelatinous plate, q Ectoderm cells (epithelial muscular cells ?) 

 in the centre of the tseniolum. 



Fig. 15. — Adradial longitudinal section through one of the eight bunches of tentacles, ten times 

 the natural size, bl Lobe pouch (or " brachial cavity"), d Endoderm. z Thickened gelatinous plate. 

 m Longitudinal muscle (limb of a deltoid muscle), q Ectoderm. The single tentacles (which all 

 have a sucking-cup at the end) are only free in the distal half, but are all connected with each other 

 by a gelatinous mass in the proximal half. 



Fig. 16. — Longitudinal section through a sucking-cup (at the distal end of a tentacle), fifty times 

 the natural size, gx Dimple-like depression in the middle of the sucking-cup, with low epithelium 

 without nematocysts. q High cylindrical epithelium of the sucking-cup, with adhesive glands and 

 nematocysts (»). g Gelatinous supporting plate, d Endoderm of the central tentacle canal (ct). y 

 Peculiar conical axial cones in the caecal distal end of each tentacle canal, which dye deep red by 

 carmine, 



Fig. 17. — Horizontal transverse section through an ovary (in the subumbral wall of a perradial 

 gastral pouch), slightly enlarged, qw Ectodermal epithelium of the subumbrella. zw Gelatinous 

 supporting plate of the subumbrella. sk The separate lobes or sacculi of the ovary, moderately 

 enlarged (comp. fig. 11). sb The small follicles composing the sacs, sc Genital sinus, (si) Oviduct. 

 sa Opening of the oviduct into the radial pouch, dw Endoderm. 



Fig. 18. — Longitudinal section through a folliculus of the ovary, moderately enlarged (comp. fig. 10). 

 The arrows show the openings of the ovarial follicles (sb) by which the latter open into the " genital 

 sinus," sc (or cavity of the sacculus). The sinus opens by the oviduct (si) into the perradial gastral 

 pouches. Letters as in fig. 17. 



Fig. 19. — Longitudinal section through a follicle of the ovary, greatly enlarged (comp. fig. 11). 

 (//'■ Endodermal epithelium of the perradial gastral pouch, so Ova. sc" Follicle cavity, from which the 

 mature ova reach the genital sinus (or cavity of the sacculus) by the oviductulus, si" (comp. fig. 18). 



Fig. 20. — Eadial transverse section through the circular marginal muscle, showing the dendritic 

 supporting folds of the fulcrum, slightly enlarged, qw Ectodermal epithelium of the subumbrella. 

 m Muscular plate, zw Supporting plate of the subumbrella, d Endodermal epithelium of the gastral 

 punches. 



Fig. 21. — An umbrella funnel with the adjacent gastral openings (go) slightly enlarged, seen from 

 the inside, gd Palatine groove (oral end of the gastral opening), gk Ovarial sacculi. /Gastral 

 filaments bordering the margins of the gastral openings), ft Tseniola. 



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