59 



Artskar akter. 



Zoaiithodemet indtil 28""" hoit. Stammen rund. furet, 

 omtrent 20'"'" i Omfang ved Grunden, aftager i Tykkelse 

 op imod Toppen, hvor den deler sig i 2 Grene, der igjen 

 danne Smaagrene, som hver bærer Grupper af Polyper. 

 Basaldelen tyk, fast, noget udvidet. Strax ovenfor denne 

 og til Toppen er Stammen rundt om forsynet med korte, 

 tykke Grene, staaende temmelig langt fra hverandre, og 

 hvoraf flere, lige ved Udspringet, dele sig i to, som atter 

 dele sig i mange Smaagrene, der hver bærer 6 — 7 tæt- 

 staaende Polyper; andre Grene, og det de fleste, dele sig 

 et Par Millimeter fra Stammen i mange korte og sammeii- 

 tramgte Smaagrene, som hver bærer et lignende Antal 

 Polyper. Disse ere bægerformede, 3""" lange, med en kort, 

 smal Bagkrop, noget udvidet Forkrop, hvor Spiklerne 

 ordne sig i Længderækker. Tentaklernes aborale Side for- 

 synet med Spikier, der paa den nederste Halvdel ligge 

 paalangs, paa den øverste paatvers. Paa Basaldelen ere 

 sammensatte Stjerner og vingeformigt udvidede, takkede 

 Spindler de almindeligste. Den nederste Del af Stammen 

 fattig paa Spilder ; den øvrige Del af Stammen samt 

 Grenene med deres Forgreninger spikelfri. Polypkroppen 

 rig paa Spilder, der væsentligst fremtræde under Spindel- 

 f ormen. Farven : Stammen og Grenene graagrønne, Polyperne 

 o'vaalige. 



Drifa 1 hyalina, n. g. et sp. 



Tab. VII, Fig. 1—44. 



Zoanthodemet er indtil 80""" høit. Stammen er 

 rund, glat, omtrent 40""" i Omkreds ved Grunden og af- 

 tager kun lidet i Tykkelse op til Toppen, der udvider sig 

 noget og bærer 2 — 3 Grupper Polyper. Paa selve Stammen 

 udspringe dels enkelte, dels Klynger af Polyper ; de enkelte 

 Polyper gaa umiddelbart over i Stammen; men førend hver 

 Klynge gaar over i samme, samle de sig i en yderst kort 

 Stilk. Basaldelen er nøgen, furet paalangs, læderagtig og 

 omtrent 15™'" høi. Stammen er rundtom forsynet med 

 flere Grene, der alle ere meget tykke, — ja et Par af 

 dem have endog næsten samme Tykkelse som Stammen, 

 men Længden er meget forskjellig, især er en, som sidder 

 omtrent midt paa Stammen, meget lang, indtil 40""". Grenene 

 ere lige fra deres Udspring optagne dels af enkelte Polyper, 

 dels af Grupper paa 3—5, men fornemmelig af Smaagrene, 

 der overalt ere saa rigt forsynede med Polyper, at de som 



Specific characteristics. 



The Zoanthodem measures up to 28""" in height. 

 The stem is cylindrical, grooved, and measures about 

 20'""' in circumference at the base, but diminishes in thickness 

 up towards the summit, at which point it ramifies into 2 

 branches which, again, ramify into branchlets, each of 

 them carrying groups of polyps. The basal part is thick, 

 firm, and somewhat dilated. Immediately above the basal 

 part, and up to its summit, the stem is, round about it, 

 furnished with short thick branches placed pretty far apart 

 from each other, and of these several, quite at their root, 

 ramify into two, that again ramify into numerous branch- 

 lets, each of which carries 6 — 7 closely-set polyps; other 

 branches, and these the greater number, ramify, a couple 

 of millimetres beyond their roots, into many short, and 

 crowded, branchlets, each of which carries a similar num- 

 ber of polyps. These are chalice-formed, and measure 3"'"' 

 in length ; they have a short, narrow, posterior body, and a 

 somewhat dilated anterior body, on which the spicules 

 arrange themselves in longitudinal series. The aboral 

 side of the tentacles is furnished with spicules which, upon 

 the lowest half part, are placed longitudinally, and on the 

 uppermost part transversally. In the basal part, complex 

 stellates, and pennate dilated, spicate fusees are the most 

 frequent spicular forms. The lowest part of the stem is 

 poor in spicules. The remainder of the stem and, also, 

 the branches with their ramifications are devoid of spi- 

 cules. The body of the polyp is rich in spicules which 

 appear, principally, in the fusiform. The colour of the 

 stem and the branches is greyish-green ; the polyps greyish. 



1 Drifa = Sneirymphe. Snestorm. 



Drifa 1 hyalina, n. g. et sp. 



PL VII, figs. 1-44. 



The Zoanthodem measures up to 80""" in height. 

 The stem is cylindrical, smooth, and measures about 40""" 

 in circumference at the base; it diminishes only slightly 

 towards the summit, where it becomes somewhat dilated, 

 and carries 2 — 3 groups of polyps. On the stem itself., 

 partly, single, partly, bunches of polyps shoot out; the 

 single polyps become, immediately, produced into the 

 stem, but before] each bunch is produced into the stem it 

 collects together into an extremely short stalk. The basal 

 part is bare, longitudinally grooved, coriaceous, and 

 measures about 15""" in height. The stem is. round 

 about it, furnished with several branches, all of which are 

 very thick, indeed, a couple of them have. even, almost 

 the same thickness as the stem; the length is, however, 

 very variable ; one especially, situated about the middle of 

 the stem, is very long, and measures up to 40""" in length. 



1 Drifa — Snow-nymph, Snowstorm. 



8* 



