92 



Nephthya polaris, n. sp. 



Tab. XIII. Fig. 2—45. 



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

 omtrent 20""" 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 au. den mere 

 eller mindre tæt besat med Globigeriner i forskjellig 

 Størrelse, Fig. 2. 3. 4. Paa enkelte Steder sta a disse 

 Foraminiferer saa tæt. at det ser ad, 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, da de maa 

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

 smaa, der staa sum hvide Punkter i Sarcosomaet. men 1 11- 

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

 ettersom de tiltage i Størrelse, voxe sig dybere ind i Huden, 

 hvor de vistnok forblive som Pseudoparasiter hele Livet 

 igjennem. Det er vel at hegge Mærke til. at disse Fora- 

 miniferer tindes paa alle Exemplarer. der dog ere fra 

 tre langt fra hinanden liggende Lokaliteter. Kun paa e1 

 Par yderst smaa Exemplarer sees de ikke. Basaldelen er 

 skiveformigt udvidet, temmelig tyk og Iæderagtig; paa et 

 Exemplar deler Stammen sig i to strås 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 1'dseende. Fig. 5. Baa.de Basalen, Stammen 

 og Grenene ere rige paa Kalk. 



Polyperne udspringe direkte fra Grenen og ere tildels 

 stillede kredsformigt rundt om samme. — som oftest ere de 

 isolerede, 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 nad 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 Rygsiden og de aborale Flader af 



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

 paa Bugsiden ere Spiklerne derimod sparsommere, hvor- 

 for Polyperne gjerne hoie 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 Spikler, som Mesenterialfilamenterne ere synlige, 



Nephthya polaris, n. sp. 



Pl. XIII, figs. 2-4.-.. 



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

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

 ference at the base, but diminisb.es 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. bere, more 

 or less closely. beset with globigerina of variable size 

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

 are plaeed so close. that the stem acquires a granular 

 appearance (Pl. XIII. fig. 2). They appear as it' embed- 

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

 cavity is lett. and they eould evidently not voluntarily come 

 away. as they require tu be dug out with rine 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 the\ progress in size, grow deeper into the integument, 

 and \\ heiv they must certainly remain as pseudo-parasites 

 all throughout lite. It must he carefully borne in mind 

 that these foraminifera are found in all the specimens, 

 which are. however, trom three localities at a. great distance 

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

 small specimens that the] 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, immediatelj above the basal part, but each ut' these 

 steins is branchless |on the lowest third part (Pl. XIII. 

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

 are pretty thick: they are closelj beset with polyps. which 

 gives tu thein a globular appearance (Pl. XIII. fig. .">). 

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

 in calcium. 



The polyps spring direct trom the branch and are, 

 partly. situated in rings round it: they are must frequently 

 isulated. but. QOw and then. two and three polyps are séen, 

 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 Hat 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 blimt 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 tunn. almost, 

 a calcareous shield (Pl. XIII. rig. 7 1. 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 



