PLATE XVIII. 



Figs. 1-7. Dicymba diphyopsis (p. 210). 



Fig. 1. The entire corm, drawn from life, with expanded trunk, and twelve fully developed ordinate 

 cormidia. p, Pneuuiatophore ; n, nectophores ; w, subumbrella ; v, velum ; a, axial trunk. 



Fig. 2. A single cormidium. s, Siphon j sh, its four hepatic ridges ; sr, proboscis ; sb, basigaster ; /, tentacle ; 

 y, cyston ; q, palpons ; r, palpacles ; b, bracts ; h, androphores ; /, gynophores ; a, trunk of the corm. 



Fig. 3. A female gonodendron. 



Fig. 4. A single female gonophore. fu, Umbrella ; o, ovarium with a single egg, surrounded by a network 

 of spadicine canals (cy) ; utj, ocelli of the margin ; cr, radial canals. 



Fig. 5. A male gonodendron. 



Fig. 6. A single male gonophore. hu, Umbrella ; km, spermarium ; cr, radial canals. 



Fig. 7. Transverse section through the trunk. at, Axial canal of the trunk ; d, entoderm ; m, longi- 

 tudinal muscles ; e, exoderm ; i, bud in the ventral median line ; ad, nerve in the dorsal median 

 line. 



Figs. 8-17. Agahna eschsckoltzii, n. sp. (p. 226). 



Fig. y. The entire corm, drawn from Hfe. The nectosome is composed of an apical pneumatophore (p) and 

 four pairs of nectophores (?i). The subspherical siphosome is densely covered with bracts (b) ; from 

 its axial cavity issue below a number of siphons (s) and tentacles, palpons (q) and palpacles (r). 



Fig. 9. A single nectophore, from the dorsal side, w, Subumbrella ; uy, ocelli. 



Fig. 10. A trilobate bract, from the dorsal side, be, Bracteal canal. 



Fig. 11. A quiucpaelobate bract, from the dorsal side. 



Fig. 12. A trilobate bract, in profile. 



Fig. 13. A quinquelobate bract, in profile. 



Fig. 14. A single tentilkun. fp, Pedicle; th, involucre; th; cnidoband ; fa, terminal ampulla; tc, paired 

 lateral horns. 



Fig. 15. A female gonodendron. fu, Umbrella of the gynophores; o, egg; a, trunk. 



Fig. 16. A single gynophore. fu, Umbrella ; cr, its four radial canals ; cc, circular canal ; cy, spadicine canals of 

 the manubrium (around the egg) ; o, ovule. 



Fig. 17. A male gonodendron. a, Trunk; hu, umbrella of the androphores; hm, spermarium. 



