66 



radiært 8 Striber henimod Tentakelranden og vise Inser- 

 tionerne paa Mundskiven for de 8 Septa, Fig. 32. 



Hele Zoanthodemet er ligesom overstrøet med Nenia- 

 tocyster, der dog ere i storst Mængde tilstede paa Poly- 

 perne. De kunne sees med Loupen, ere pæreformige, 

 brune, 0.007°™ lange, 0.003""" brede; de fleste ere for- 

 synede med en overordentlig lang Spiraltraad, Fig. 33, a. 34, 

 medens andre, der ere sjeldnere, ikke have nogen saadan 

 Spiraltraad, men ende i en lang, stiv. yderst fin Spids. 



Den anatomisk-histologiske Bygning er ikke væsentlig 

 forskjellig fra den, jeg har beskrevet hos Drifa hyalina, 

 kun er der i det ydre Epithellag (Ectodermet) paa hele 

 Zoanthodemet en Mængde brune Pigmentceller, der giver 

 dette sin Farve, og som ikke tindes hos Drifa hyalina. 



Kjonsprodukterne udvikle sig som sædvanligt paa 

 Septula i den bagerste Del af Mavehulheden ; men da de 

 i Smaagrenenes Peripheri siddende Polyper forhenge sin 

 Mavehulhéd ned i dem, saa sees Smaagrenene ofte ganske 

 opfyldte med Æg (Exemplaret. som jeg havde til Under- 

 søgelse, var nemlig en Hun). Lignende iagttages ogsaa for 

 Hovedgrenenes Vedkommende, hvor Polypernes Mavehulhéd 

 forhenger sig ned i Grenen. 



Basaldelen er overmaade rig paa Spikler, der ligge 

 tildels pakkede paa hverandre og forekomme under følgende 

 Former: bladede Klubber med kort. tilspidset Skaft; de 

 ere meget almindelige, 0.180""" lange, O.OSO""" brede foroven, 

 Fig. 35; bladet og vortet Klubbe. 0.160'"" lang, 0.1 nu 

 bred med et kort. bredt Skaft, Fig. 36; Firling i Form 

 af en Blomsterkvast, bærende Korstegn paa Midten, 0.200""" 

 lang, 0.12(1""" bred, Fig. 37; takkede og vortede Dobbelt- 

 stjerner, fra 0.100—0.140""" lange og fra 0.030- -0.060 

 luede, Fig. 38. 39, og endelig enkle, stilkede Stjerner, 



0.060""" lange. Stjernen 0.040 bred, Stilken kort og 



næsten glat, Fig. 40. 41. 42. 



Paa Stammens nedre og midterste Del og paa 

 Hovedgrenene ligge Spiklerne flere Steder samlede i smaa 

 Klumper, ellers nærme de sig meget til hverandre uden 

 at være sammenpakkede, som Tilfældet er paa Basaldelen. 

 De optræde her hyppigst som bladede og vortede Klubber, 

 0.140""" lange, 0.118'""' brede med et yderst kort. smalt 

 Skaft, lig dem paa Basaldelen, Fig. 35; imellem dem sees 



tacles measure about 3""" in length, and have short thick 

 pinnules devoid of spicules. The oral disk is a little 

 arcuate, and in its middle the oblong oral aperture appears, 

 from whose labiæ 8 stripes spring, radially, towards the 

 tentacular margin, and show the insertions of the 8 septa 

 upon the oral disk (fig. 32). 



The entire Zoanthodem is, as it were, overstrewed 

 with nematocysts which, however, are present in greatest 

 abundance on the polyps. They rna v be observed with the 

 assistance of a polyoptrum, and are piriform. brown in 

 colour, and measure 0.007""" in length, and 0.003""" in 

 breadth; most of them are furnished with an extremely 

 long spiral filament (fig. 33, a. 34); whilst others, which 

 are more rare. have no such spiral filament, hut terminate 

 in a long. stiff, extremely fine point. 



The anatomo-histological structure is not, essentially, 

 different from that which I have described as pertaining 

 to Drifa hyalina; only, there is in the exterior epithelial 

 laver i the ectoderm) of the entire Zoanthodem, a multitude 

 of, brown pigment-cells, which impart to it its colour. and 

 these are not found in Drifa hyalina. 



The sexual products develope themselves on the 

 septula as usuaJ, in the posterior part of the ventral 

 cavity. hut as the polyps situated in the periphery of the 

 branchlets prolong their ventral cavity down into them. the 

 branchlets are. frequently, seen quite filled with ova. (The 

 specimen which I had, for observation, was a female). The 

 same. is observed in respect, also, of the main branches, 

 where, the ventral cavity of the polyps prolongs itself Ylown 

 |nto the branch. 



The basal part is superabundantly rich in spicules, 

 which are placed, partly, packed upon each other, a ml 

 appeai' in the following forms: foliaceous clavates with 

 short acuminate shaft ; these are very frequent, and mea- 

 sure 0.180"™ in length and 0.080""" in breadth above, 

 (fig. 35); foliaceous and warted clavates, measuring 0.160 

 in length, and 0.100""" in breadth, with a short broad 

 shaft (fig. 36): quadruplet in form.of a flower-tuft, carrying 

 a crucial sign in the middle. and measuring 0.200""" in 

 jength and 0.120""" in breadth (fig. 37); spicate and warted 

 bistellates, measuring from 0.100 — 0.14O""" in length, and 



from 0.030—0.060 in breadth (figs. 38.39); and, finally, 



single pedunculated stellates, measuring 0.060""" in length; 

 the star measuring 0.040""" across. The stalk short and 

 almost smooth (figs. 40. 41. 42). 



On the lower and mesial parts of the stem, and 

 also, on the main branches. the spicules are placed, in 

 some places, collected in small clumps, or they approach 

 much to each other, without, however, becoming packed 

 together such as is the case on the basal part. They 

 appear, here, most frequently, as foliaceous and warted 

 clavates. measuring 0.140""" in length. and 0.118""" in 



mindre Rum paa Bagsiden, der er ganske blottet for Spikler. Det 

 er sandsyuligvis denne Eiendommelighed der gjor. at næsten alle 

 Polyper, især elter Doden, ere noget krumbøiede paa Bagsiden. 



or smaller spaee on the ventral side, that is perfectly devoid of 

 spicules. It is. presumably, that peculiarity which causes almost 

 all of the polyps, especially after death. to become somewhat curved 

 on the ventral side. 



