92 



Nephthya polaris, n. sp. 



Tab. XIII, Fig. 2—45. 



Zoanthodemet indtil 35""" høit. Stammen rund, blød, 

 omtrent 20 røra i Omfang ved Granden, men aftager lidt i 

 Tykkelse op imod Toppen, der er tæt besat med Polyper. 

 Den nederste Trediedel — paa enkelte Exemplarer den 

 nederste Halvdel — blottet for Grene, og her er den mere 

 eller mindre tæt besat med Globigeriner i forskjellig 

 Størrelse, Fig. 2. 3. 4. Paa enkelte Steder staa disse 

 Foraminiferer saa tæt, at det ser ucl, som om Stammen 

 var sandstrøet, Fig. 2; de ligge ligesom indgravede i 

 Sarcosomaet, saa at de efterlade en Grube, naar de fjernes 

 og kunne visselig ikke frivillig komme bort, cia de maa 

 graves ud med fine Naale. Der er en hel Del ganske 

 smaa, der staa som hvide Punkter i Sarcosomaet, men til- 

 lige sees en Mængde alt større og større Individer, der. 

 eftersom de tiltage i Størrelse, voxe sig -dybere incl i Huden, 

 hvor de vistnok forblive som Pseudoparasiter hele Livet 

 igjennem. Det er vel at lægge Mærke til, at disse Fora- 

 miniferer findes paa alle Exemplarer, der dog ere fra 

 tre langt fra hinanden liggende Lokaliteter. Kun paa et 

 Par yderst smaa Exemplarer sees de ikke. Basaldelen er 

 skiveformigt udvidet, temmelig tyk og læderagtig ; paa et 

 Exemplar deler Stammen sig i to strax ovenfor Basaldelen, 

 men hver af Stammerne ere grenløse paa den nederste 

 Trediedel, Fig. 2. Grenene staa rundt Stammen, ere tem- 

 melig tykke ■ og tæt besatte med Polyper, der give dem et 

 kugleformet Udseende, Fig. 5. Baacle Basalen, Stammen 

 og Grenene ere rige paa Kalk. 



Polyperne udspringe direkte fra Grenen og ere tildels 

 stiilecle kredsformigt rundt om samme, — som oftest ere de 

 isolerecle, men af og til sees to og tre Polyper at være 

 sammenvoxede ved Granden, Fig. 6. De ere 4""" lange, 

 traktformige, med en yderst kort Bagkrop, en bred For- 

 krop og med temmelig flad Mundskive, Fig. 6. 7, i hvis 

 Midte sees en lang Mundaabning. Tentaklerne ere 1.5"™ 

 lange med stumpe Ender; Pinnulerne korte, tykke. 



Hele Polypkroppen er rig paa Kalkspikler; især er 

 dette Tilfældet med Eygsiden og de aborale Flader af 

 Tentaklerne, hvor de danne næsten et Kalkpantser, Fig. 7 ; 

 paa Bugsiden ere Spiklerne derimod sparsommere, hvor- 

 for Polyperne gjerne bøie sig imod denne Side, Fig. 6; 

 Pinnulerne ere uden Kalk. 



Stammen og Grenene ere halv gjennemsigtige. Poly- 

 perne ere saa gjennemsigtige, at saavel Svælget, der er 

 uden Spilder, som Meéenterialfilam en terne ere synlige, 



Nephthya polaris, n. sp. 



Pl. XIII, figs.' 2-45. 



The Zoanthodem measures up to 35'"™ in height. 

 The stem is cylindrical, soft, and about 20""" in circum- 

 ference at the base, but diminishes a little in thickness 

 up towards the summit, which is closely beset with polyps. 

 The lowest third part — in a few specimens the lowest 

 half part — is devoid of branches, and it is, here, more 

 or less closely, beset with globigerina of variable size ' 

 (Pl. XIII, figs. 2. 3. 4). In a few places these foraminifera 

 are placed so close, that the stem acquires a granular 

 appearance (Pl. XIII, fig. 2). They appear as if embed- 

 ded in the sarcosoma, so that when they are removed a 

 cavity is left, and they could evidently not voluntarily come 

 away, as they require to be dug out with fine needles. 

 There are a great many very minute ones, which appear 

 as white points in the sarcosoma, but, besides these, a 

 multitude of individuals of progressive size are seen, which, 

 as they progress in size, grow deeper into the integument, 

 and where they most certainly remain as pseudo-parasites 

 all throughout life. It must be carefully borne in mind 

 that these foraminifera are found in all the specimens, 

 which are, however, from three localities at a great distance 

 apart from each other. It is only in a couple of extremely 

 small specimens that they are not observed. The basal 

 part is discoidally dilated, and is pretty thick and coria- 

 ceous. The stem, in one specimen, ramifies into two 

 parts, immediately above the basal part, but each of these 

 stems is branchless jon the lowest third part (Pl. XIII, 

 fig. 2). The branches are placed around the stem and 

 are pretty thick; they are closely beset with polyps, which 

 gives to them a globular appearance (Pl. XIII, fig. 5). 

 Both, the base and the stem with its branches, are rich 

 in calcium. 



The polyps spring direct from the branch and are, 

 partly, situated in rings round it; they are most frequently 

 isolated, but, now and then, two and three polyps are seen, 

 concreted together at the base (Pl. XIII, fig. 6). They mea- 

 sure 4""" in length, and are infundibuliform ; they have an 

 extremely short posterior body, a broad anterior body, 

 and a rather flat oral disk (Pl. XIII. fig. 6. 7) in whose 

 middle an oblong oral aperture is visible. The tentacles 

 measure 1.5""" in length, and have blunt extremities. The 

 pinnules are short. 



The entire polyp-body is rich in calcareous spicules ; 

 this is particularly the case on the dorsal side and the 

 aboral surfaces of the tentacles, where they form, almost, 

 a calcareous shield (Pl. XIII, fig. 7). On the ventral side, 

 on- the other hand, the spicules are more sparing, for 

 which reason the polyps are inclined to curve to that side 

 (Pl. XIII, fig. 6). The pinnules are noncalcareous. 



The stem and the branches are semi-transparent. 

 The polyps are so transparent that, both, the gullet, which 

 is devoid of spicules, and the mesenterial filaments are 



