57 



skopet viser sig at være en Æggestok. hvori sees parvis 

 Æg liggende, men ikke meget udviklede, Tab. XII, Fig. 

 11. 12. Svælgroret er meget vidt. strækker sig omtrent 

 halvveis ned i Grastralhulheden og er forsynet med to Svælg- 

 gruber. Parieto-basilarmuskelen er yderst tynd og meget 

 smal. 



Findested. 



Station 295. To meget smaa. yderst stærkt kontra- 

 herede Exemplarer. 

 — 3<)3. To Exemplarer. 

 353. Flere Exemplarer. 



Artskarakter. 



Hele Dyret er udstrakt 30""» høit Fodskiven bred. 

 skiveformigt udvidet med en dels rund. noget tyk, dels 

 atlang, tynd Rand og et Chitinlag paa Underfladen. Kolumnen 

 henved 25""" hoi, 18'"™ bred ved Fodskiven, 10""" bred ved 

 Tentakelranden. Dens nederste tre Fjerdedele samt Fod- 

 skivens ovre Flade stærkt inkrusteret; dens øverste Fjerde- 

 del cylindrisk. nøgen, glat, perlemorglindsende, fint foldet 

 efter Længden med en krenuleret Rand. Mundskiven flad; 

 Munden aflang, foldet, udsendende vifteformigt fine Folder 

 mod Tentaklerne. Disse, siddende i Peripherien i 2 afvex- 

 lende Rækker. 24 i hver, ere omtrent saa lange som Mund- 

 skivens Bredde. Hele den øverste, nøgne Del med Mund- 

 skive og Tentakler retraktile. Farven: Den inkrusterede 

 Del graabrun; den nogne Del bleg rosenrød med stærk 

 Perlemorglands. Mundskiven blegere med lidt mørkere 

 Straaler. Tentaklerne rosenrøde ved Grunden, deres øverste 

 Halvdel mørkere, svae;t brunlig. 



Phellia arctica, n. sp. 



Tab. III, Fig. s : Tab. XII, Fig. 13. 14: Tab. XIII, Fig. 1—4. 



Hele Dyret er i fuld Vigør med udfoldede Tentakler 

 40""» høit, 12—15""" bredt forneden, men smalner lidt af 

 opover mod Tentakelranden, Tab. III, Fig. 8; Tab. XIII, 

 Fig. 1. Fodskiven er lidt bredere end Kroppens Tykkelse; 

 den har en meget tyk, lidt indboiet Rand, og dens Under- 

 flade er lidt konkav og belagt med en ehitinagtig Membran, 

 imedens Overfladen er lidt hvælvet og stærkt inkrusteret. 



Kroppens nederste tre Fjerdedele ere omgivne af en 

 inkrusteret Overhud i Form af en Skede, der foroveu har 



Den norske Nordhavseipedition. D. C. Danielssen: Actinida. 



a septum of the 2nd order, a long bulging ribbon-like body 

 of a blinding-white colour is seen to be attached. that 

 under the microscope shows itself to be an ovary in which 

 ova are seen lying in pairs but not much developed (Pl. 

 XII, fig. 11. 12). The æsophagus is very wide, extends 

 abont half way down the gastric cavity and is furnished 

 with 2 gullet-grooves. The parieto-basilar muscle is ex- 

 tremely thin and very narrow. 



Habitat. 



Station No. 295. Two very small, extremely con- 

 tracted speeimens. 



303. Two speeimens. 

 353. Several speeimens. 



Specific characteristics. 



The entire animal is, when extended, 30""" in height. 

 The pedal disc broad, discoidally expanded, with a partly round. 

 somewhat thick. and partly oblong, thin margin, and it has 

 a chitinous layer on the under-surfaee. The column about 

 25""" in height, 18""" in breadth at the pedal disc. 10""" 

 broad at the tentacular margin. Its lowest three-fourth^ 

 part and the upper-surface of the pedal disc are strongly 

 encrusted. Its uppermost fourth part cylindric, bare, smooth. 

 mother-of-pearl lustrous, finely folded longitudinally, and 

 with a crenulated margin. The oral disc flat; the mouth 

 oblong, folded, sending out fine folds in fiabelliform towards 

 the tentacles. The tentacles, seated in the periphery in 2 

 alternating series, 24 tentacles in each, are about the same 

 in length as the breadth of the oral disc. The entire lipper 

 bare part and the oral disc and tentacles are retractile. 

 Tlæ colour. The encrusted part greyish-brown; the bare 

 part pale rose-red, with strong mother-of-pearl lustre. 

 The oral disc paler with slightly darker ravs. The ten- 

 tacles rose-red at the base, their uppermost half part 

 darker, faint brownish. 



Phellia arctica, n. sp. 



Pl. III. fig. 8; PL XII, figs. 13, 14: Pl. XIII. figs. 1—4. 



When the entire animal is in full vigour, with out- 

 stretched tentacles, it measures 40""" in height, and 12 — 15™"' 

 in breadth at the base, but diminishes in thickness a little 

 up towards the tentacular margin (Pl. III, fig. 8; Pl. XIII. 

 fig. 1 ). The pedal disc is a little broader than the thickness 

 of the body; it has a very thick, slightly involved margin, 

 and its under-surface is slightly eoncave and coated with 

 a chitinous membrane. while the upper-surface. is a little 

 arcuated and strongly encrusted. 



The lowest three-fourths part of the body is sur- 

 rounded by an encrusted outer integument, in the form of 



