IO ZOANTHARIA 



c. The large nematocysts of the filaments and of the capitular region have the same 

 structure, narrow and long (4 times longer than broad), unlike those in the other parts 



of the body wall lindahli. 



cc. The large nematocysts of the filaments are of moderate length (length being at most as 

 3-5 times breadth). The capsules of the capitular region, if any, resemble those in the 



other parts of the body wall crdmanni. 



bb. Polyps and colonies attached. The ccenenchyme more or less developed. 



d. The large nematocysts of the filaments are narrow and long (the length being more 

 than 4 times the breadth). The capsules of the capitular region of the same kind, 



but unlike those in the other parts of the body wall danielsseni. 



dd. The large capsules of the filaments are of moderate length (the proportion between 

 length and breadth being at most as 3-5 to 1). The capsules of the capitular region, 

 if any, resemble those in the other parts of the body wall. 

 e. The sphincter comparatively feeble, number of mesenteries about 32. The large 



nematocysts of the filament 22 — 31 // long, 12 // broad roscus. 



ee. Sphincter strong 



f. The large nematocysts of the filaments 34—41 n long and 10 — 12 // broad. 

 Cell-islets and lacunae often found at the base of the insertion of the mesen- 

 teries, number of mesenteries 38 — 42 bcerenislandicus. 



ff. The large nematocysts of the filaments 26 — 36// long and 10 — 12/,! broad. Cells 

 numerous, cell-islets more scarce in the mesoglcea of the body wall, but not present 

 near the base of the mesenteries; number of mesenteries 36 — 52 .... glacialis. 

 fff. The large nematocysts of the filaments 26 — 29// long and 10// broad. Numerous 

 oval or round and separate, large cell-islets, further, large lacunae containing 

 cells in the mesoglcea of the body-wall; number of mesenteries about 36. . korcni. 



Species Epizoanthus incrustatus Diib. & Koren. 



PI. 2, fig. 26. 

 Mammillifera incrustata n. sp. Diiben &. Koren 1847. Forhandl. Skand. naturf. Mode p. 268. Isis 1848 



p. 536. Sars 1851. Nyt Mag. Naturv. 6(2), p. 142, Danielsseu 1859. Nyt 

 Mag. Naturv. n, p. 45. 

 Zoanthus incrustatus Diib. & Koren, Sars i860. Forhandl. Vidensk. Christiania, p. 141. Forh. Skand. 



Naturf. Kobenhavn 8, p. 691. 

 Polythoa arenacea d. Ch. p.p. Andres 1883 Le Attinie, p. 522. 



Epizoanthus incrustatus (Diib. & Koren) Had don & Shackle ton, Se. Trans. R. Dublin Soc. 1891, 



p. 636, PI. 58, figs. 1 — 22, PI. 59, fig. 2, PI. 60, fig. 1 (contains a complete syno- 

 nymy and list of literature of this species up to 1891). 

 Epizoanthus americanus n. sp. Verrill. 1867. Mem. Boston. Soc. Nat. Hist. 1, p. 34, 45. 

 Palythoa incrustata Roule 1900. C. R. Acad. Sc. Paris. 131 1900 p. 279. 

 Sidisia incrustata Dub. & Koren Arndt Jahr. Schl. Gesells. vat. Cultur 1912, p. 123. 



