Fig. 29. A piece of the umbrella corona, with a marginal lobe (I) and the proximate insertion of a 

 tentacle, twice the natural size. The subumbral wall with the coronal muscle has been removed in 

 order to show the condition of the opened pouch. The two parallel lobe canals (bl) of the lobe which 

 are separated by the fixed clasp (kl) are connected below its distal end (kl") by the U-shaped 

 horse shoe canal (bw). The upper (7,7') and the lower (kl") end of the fibrous cartilaginous fused clasp 

 are thickened. lp Delicate margin selvedge of the lobe (patagium). cs" Distal margin of the coronal 

 sinus, mk root muscles of the tentacle (t). du umbral wall of the coronal pouch, be" Septal fissure, 

 between the two root muscles (mk) which represents the communication between the axial velar 

 pouch (be) and the abaxial avelar pouch (be"'). Comp. fig. 22. 



Fig. 30. Perradial longitudinal section through a tentacle (t) and the coronal pouch (be) belonging 

 to it, natural size, mk Root muscle of the tentacle, ex Vent hole of the tentacle, me Coronal 

 muscle. I Marginal lobes, kl Fused lobe, lp Patagium. ec Coronal furrow, cs Coronal sinus, ug 

 Gelatinous substance of the umbrella. 



Fig. 31. Iuterradial longitudinal section through a sense club (or) and the coronal pouch belonging 

 to it (be), natural size, oa Ampulla of the rhopalium (or), bl Lobe pouch, mw Subumbrella. ug 

 Gelatinous substance of the umbrella, ec Coronal furrow of the exumbrella. cs Coronal sinus ; du 

 its umbral endoderm. be Coronal pouch, me Coronal muscle. 



Fig. 32. A sense club (or) with its ampulla (oa) and the two bordering ocular lobes (I), seen from 

 below, twice the natural size. The two lobes are drawn apart and retroverted. lp Patagium of the 

 lobes, kl Fused clasps, me Coronal muscle, ta Adradial tentacles. 



Fig. 33. An interradial cathamma or septal node (hi) seen from the subumbrella, twice the 

 natural size ; having the intergenital muscle (ms) above, the interradial deltoid muscle (md") below. 



Fig. 34. A bit of the exumbral zonal muscle (" M. zonaris," mz) along with the two subradial 

 triangular points (mz") which it sends out in the longitudinal furrow between two pedalia (ud). ec 

 Coronal furrow of the exumbrella (thinnest part of the gelatinous body). Twice the natural size. 

 (Comp. fig. 35.) 



Fig. 35. Radial section through the exumbral coronal furrow (ec) and the exumbral zonal muscle 

 (mz) lying beneath it. ug Gelatinous substance of the umbrella, du Endodermal epithelium of its 

 abaxial side, ge Ectodermal epithelium of its abaxial side. Twice the natural size (comp. fig. 34). 



Fig. 36. Horizontal transverse section through the root muscle of a tentacle, slightly enlarged. 

 ink Muscular folds of the root muscle ; z its supporting plate, it Subumbral funnel cavity of the 

 tentacle, qw Ectodermal epithelium of the funnel cavity, qw Ectodermal epithelium of the 

 subumbrella. be Inner coronal pouch (velar pouch), be"' Outer coronal pouches (avelar pouch). 

 be" Fissure of communication between the two pouches (septal fissure). 



Fig. 37. Transverse section through the interradial deltoid muscle (md") below the cathamma, 

 slightly enlarged, g Supporting plate, d Endoderm of the coronal sinus (eg), q Ectoderm of the 

 subumbrella. 



Fig. 38. A genitalium (sperarium) along with the upper part of another genitabum of the same 

 pair, twice the natural size, mg Musculus intergenitalis. Ten Interradial cathamma (septal nodes). 

 md" Interradial deltoid muscle, mn Musculis congenitalis. gt Sterigma genitalie (framework of the 

 testis). 



Fig. 39. Transverse section through a fold of the spermarium, slightly enlarged, gb The follicles 

 comprising the fold, gt Sterigma (fulcral framework) of the spermarium. zw Supporting plate of the 

 subumbrella. qw Ectoderm of the plate, mn Musculus congen italis. 



Fig. 40. A follicle of the spermarium greatly enlarged, gt Sterigma (endodermal), framework of 

 the spermarium, made of connective tissue, and forming sheaths round the follicles, dg Endodermal 

 germinal epithelium (in the periphery of the follicle), gz Mature spermatozoa in the interior of the 

 follicle. 



