PLATE VII. 



Stephalia corona, n. sp. (p. 297). 



Diaru. 



Fig. 39. Lateral view of a young corm (in profile, from the right side), p, Pneumatophore ; /, auro- 

 phore ; lo, auropyle ; n, corona of neetophores ; uo, ostium of the nectosac ; cc, ring-canal ; 

 s, siphons ; t, tentacles ; below, central siphon (basal opening of the trunk), . x 10 



Fig. 40. Sagittal section through the same corm ; signification of the characters the same as in fig. 39. 

 Beyond the pneumatophore (pi) is visible the hypocystic cavity (ah), and on its dorsal side 

 the aurophore (I). From the centre of the hypocystic cavity arises the central axial canal 

 (ca) ; it passes through the vertical axis of the cartilaginous trunk (a), gives off numerous 

 anastomosing branches (ac), and opens through the mouth of the central siphon (op), 

 i, Ventral series of buds. Each siphon (s) bears a simple tentacle (t) on the dorsal 

 side of its base, but no gonodendron, . . . . . . . x 1 



Fig. 41. The distal end of another corm. ao, The prostoma, or the basal mouth-opening of the 



primary siphon (afterwards the axial canal, ca, of the trunk, ap), . . x 20 



Fig. 42. A single siphon of Ehodalia miranda, with a tentacle, sp, Pedicle ; sb, basigaster ; sg, stomach ; 

 sh, hepatic ridges ; sr, proboscis ; so, mouth ; tr, rings of the tentacle ; tg, its suspensorium ; 

 tt, insertions of the tentilla (ts); these are lost in the distal part (at the right hand), . x 10 



Fig. 43. Two large ensiform cnidocysts, from the lateral series of the tentillum ; a, closed ; B, opened, 



with protruded cnido-filament, . . . . . . . . x 400 



Fig. 44. Bud of a nectophore, in longitudinal section, np, Peduncle ; w, suburnbrellar cavity ; v, 



incipient velum ; c, gastral cavity ; d, entoderm ; e, exoderm ; z, fulcrum, . . x 100 



Fig. 45. Bud of a nectophore, in transverse section. Characters the same as in fig. 44. The four 



radial canals (nr) are visible, between the cathamma (d), . . . x 100 



Fig. 46. A mature androphore of Rhodalia miranda. lis, Spermarium ; hx, spadix ; hr, radial canals 



of the umbrella (w) ; uo, ostium of the umbrella, . . . . x 50 



Fig. 47. Muscle-epithelium of the outside of the pneumatophore. e, Exoderm-cells, . . . x 300 



Fig. 48. Lateral view of a corm of Stephalia corona (from the right side), p, Pneumatophore ; 

 I, aurophore ; w, neetophores ; np, their pedicles ; v, velum ; s, siphons ; so, their mouth- 

 openings ; g, gonophore-buds ; ap, protosiphon, . . . . . . x 5 



Fig. 49. A single cormidium of another specimen, ah, Common pedicle of the cormidium ; s, siphon ; 



so, its mouth ; ga, gonostyle ; /, gynophores ; o, eggs ; h, androphore, . . x 50 



Fig. 50. A young larva (Auronula). pa, Cavity of the pneumatophore ; /, aurophore ; hn, its pistil ; 

 lo, aurostigma ; ap, primary siphon ; sc, its cavity ; ao, its mouth ; e, exoderm ; d, 

 entoderm, . . . . . . . . . x 10 



