Diam. 



PLATE IV. 



Rhodalia miranda, n. sp. (p. 302). 



Fig. 1 5. Sagittal section through the complete corm, in the vertical median plane, p, Pneumato- 

 phore ; pa, its wide cavity filled with air ; I, aurophore ; Im, its pistil ; lo, its external 

 opening (aurostignia); i, ventral series of buds ; n, young ventral nectophore ; np, peduncle 

 of a dorsal nectophore ; a, cartilaginous bulb of the trunk ; ac, reticulum of the trunk- 

 vessels ; aa, large flat hypocystic cavity of the trunk, beyond the pneumatophore ; 

 ah, cormidia ; g, gonodendron ; r, gonopalpon ; s, siphon, . . . . x 2 



Fig. 16. Apical view of the corm (from above), after removal of the nectophores and the greatest part 

 of the pneumatophore ; the horizontal section lying somewhat above the bottom of the 

 float (pa). The corona of white rays, which surrounds it, represents the transverse sections 

 of the pedicles of the nectophores (np 1 ), and this is surrounded by the peripheral corona 

 of cormidia (</). The auroduct (or the central canal of the aurophore, la) opens inside 

 by the auropyle (li), outside by the aurostigma. pi, Foveola ; I, aurophore (in the 

 median line of the dorsal side) ; Ir, radial chambers of the aurophore ; l, series of buds (in 

 the median line of the ventral side); ie, dorsal canal of the trunk (for the buds); np, 

 peduncle of the nectophore ; g, corona of the gonophores. A single nectophore (n) 

 remains, v, Velum ; w, ostium of the suburnbrella. 



Fig. 17. Series of buds on the ventral side of a young corm (blastocrene of the siphosome), immediately 

 beyond the pneumatophore. n, Young nectophore ; nc, its ring-canal ; v, velum ; to, sub- 

 umbrella ; ah, cormidia, or groups of buds, developed in a spiral ; each group being 

 composed of a siphon (s) and a gonodendron (g), . . . . . . x 5 



Fig. 18. A young gonodendron, with two branches, one of which bears a long cylindrical palpon (a). 



ga, Gonostyle ; gc, its canal; </, gonophores, . . . . . x 10 



Fig. 19. A single siphon, sp, Pedicle ; ml, longitudinal muscles of the stomach ; sh, remnants of 



the hepatic stripes ; sr, proboscis ; so, mouth, . . . . . . x 1 



Fig. 20. A detached siphon, connected with its tentacle, xp, Pedicle of the siphon ; sh, hepatic ridges; 



sr, proboscis ; /, tentacle ; ts, tentilla (compare pp. 290 to 292), . . . . x 5 



Fig. 21. Transverse section of a tentacle, c, Central canal ; d, entoderm ; me, ring-muscles ; z, ful- ' 



crum ; ml, longitudinal muscles; e, exoderm (compare p. 292), . . . . x 100 



Fig. 22. A portion of a tentacle with the insertions of the tentilla (fo). tr, "Rings of the tentacle, . x 20 



Fig. 23. A single tentilluni. tb, Basal pedicle : ik, cnidoband ; tk v large lateral cnidocysts ; tk n , small 



median cnidocysts ; tl, elastic ligament (angle-band); If, terminal filament, . . x 200 



