75 



med spredte Cinclides, hvorigjennem paa et Par af dem 



Acontier træde frem. 



Mundskiven er næsten plan med en aflang, lidt frem- 

 springende Mund, hvis Læber ere tykke og have 5 Folder 

 paa hver Side af de temmelig brede Mundvige (Gonidie- 

 gruber), Tab. XV. Fig. 1. Tentaklerne staa i 3 afvexlende 

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

 skivens Bredde, dug ere de i den inderste Række noget 

 lrengere. Den yderste Række staar paa Kolumnens øverste 

 Rand. 



Farven. Den nøgne Del af Kolumnen er blaaviolet, 

 men dens tentakulære Rand er noget blegere, saa det ser 

 nd. som om den havde en Ring om sig. Mundskiven er 

 ligeledes blaaviolet med lysere Straaler og en lysere Ring 

 om Munden. Tentaklerne ere intens blaaviolette med rød- 

 lige Ender. Skeden har et gronligt Skjær, imedens Længde- 

 folderne spille noget i det Violette. 



Phellia spitsbergensis sad paa Buccinum hydrophannm. 

 og naar den strakte sig noget ud, dannede den en Kegle 

 oller Soile med hvælvet Top. men tråk den sig ganske ind 

 i Skeden, fremkom en Halvkugle med en fin Aabning paa 

 Midten. Tab. IV. Fig. 3; Tab. XV. Fig. 1. 



Et Tversnit af Kroppens skedebeklædte Del viser, at 

 Skeden danner et ydre Lag, bestaaende af en seig Slim- 

 membran, hvori er inkrusteret Sand og Skjælstumper, Tab. 

 XV. Fig. 2 «. og et indre Lag, dannet af en fast, fibrillær 

 Membran (Cuticula), Tab. XV, Fig. 2 b. Denne er fast 

 adhæreret til det indenfor liggende Ectoderm. der bestaar 

 af temmelig korte Cylinderceller. som ere fattige paa Proto- 

 plasmaindhold og uden Cilier, Tab. XV, Fig. 2 c. og imellem 

 hvilke iagttages kolbeformede, encellede Slinikjertler. Inden- 

 for Ectodermet er et bredt, fibrillært Bindevævslag, forsynet 

 med Bindevævslegemer og fine Ernæringskanaler. Tab. XV. 

 Fig. 2 d, og omtrent i Midten af dette Bindevævslag ere 

 eirkulære Muskler indleirede, der danne tynde Bnndter, 

 Tab. XV. Fig. 2 e. Paa den indre Flade af Bindevævet 

 er som sædvanligt Endothelet med sine lange Cilier fæstet, 

 Tab. XV. Fig. 2 /'. Den nøgne Del af Kroppen frem- 

 byder paa Tversnit et noget andet Billede. Ectodermet 

 bestaar her af lange Cylinderceller med store, aflange 

 Kjerner, omgivne af Protoplasma og forsynede med lange 

 Cilier. Imellem Cyliffdercellerne sees i stor Mængde baade 

 encellede Slimkjertler og Nematoeyster. Bindevævslaget 

 indenfor Ectodermet er noget bredere end paa den inkru- 

 sterede Del. ligesom de eirkulære Muskler synes at være 

 stærkere udviklede, end paa denne. 



Der er 12 Par fuldstamdige Septa. Af disse er der 

 li Par. der maa betragtes som de principale, Tab. XV. 

 Fig. 3 «; de ere meget stærkere i Bygning, ere golde, og 

 til dem hore de 2 Par Retningssepta, Tab. XV, Fig. 3 R, 

 der ere stærkt iøinefaldende derved, at deres intraseptale 

 Rum er meget vidt, ligesom de longitudinelle Muskler ere 



is smooth, lustrous, and has likewise fine longitudinal fur- 

 rows. and is also furnished with scattered cinclides through 

 a couple of which acontia protrude. 



The oral disc is almost plane, with an oblong, some- 

 what projecting mouth whose labiæ are thick and have o 

 folds on each side of the rather broad oral angles (gonidial- 

 grooves) (Pl. XV, fig. 1). The tentaeles are placed in 3 

 alternating series. 24 in each. and are about the same 

 length as the oral disc is broad, but they are. however. 

 somewhat longer in the innermost series. The outermost 

 series stands upon the uppermost margin of tho column. 



TJie colour. The bare part of the column is blue-violet. 

 but its tentacular margin is somewhat paler, so that it appears 

 as if it bad an annulus round it. The oral disc is also 

 blue-violet with lighter coloured rays and a lighter coloured 

 annulus round the mouth. The tentacles are intense blue- 

 violet with reddish extremities. Tbe sheath has a greenish 

 tinge, whilst the longitudinal folds shade a little to violet. 



Phellia spitsbergensis was seated on Buccinum hydro- 

 planum. and when it stretched itself somewhat out, it 

 formed a cone or pillar with an arcuate top, but when it 

 quite withdrew itself into the sheath a hemisphere, with a 

 minute aperture in the middle. was produced (Pl. IV, fig. 8; 

 Pl. XV. fig. 1). 



A transversal section of the portion of the body clad 

 with the sheath shows, that the sheath forms an outer 

 laver, consisting of a viscid. mucous membrane in which 

 sand and fragments of shells are encrusted (Pl. XV. fig. 2 a); 

 and an inner laver, formed of a firm fibrillar membrane 

 (cuticumm) (Pl. XV, fig. 2 b). This is firmly adherent to 

 the ectoderm lying inside of it, which consists of 

 rather short cylinder-cells poor in protoplasmic contents 

 and without eiliæ (Pl. XV, fig. 2 c), and between which 

 claviform uni cellular mucous glands are observed. Inside 

 of the ectoderm there is a broad fibrillar layer of con- 

 nective-tissue, furnished with connective-tissue corpuscles 

 and fine nutritory ducts (Pl. XV, fig. 2 d), and at about 

 the middle of this la.yei* of connective-tissue the circular 

 museles are embedded, forming thin fasciculi (Pl. XV, 

 fig.*2 e). On the inner surface of the connective-tissue. 

 the endothelium, with its long eiliæ, is secured as usual 

 (Pl. XV. fig. 2 /). The bare part of the body presents, 

 in transversal sections, a somewhat different picture. The 

 ectoderm, here, consists of long cylinder-cells containing 

 large oblong nuclei surrounded by protoplasm. and fur- 

 nished with long eiliæ. Between the cylinder-cells a great 

 abundance of both unicellular mucous glands and nemato- 

 cysts are observed. The layer ol connective-tissue inside of 

 the ectoderm, is somewhat broader than on the encrusted 

 portion, whilst its circular museles appear also to be more 

 powerfully developed than upon the latter. 



There are 12 pairs of perfect septa. Of these there 

 are 6 pairs which must be considered as the principal septa 

 (Pl. XV. fig. 3 «); they are somewhat stronger in struc- 

 ture, are sterile, and to them belong the 2 pairs of direc- 

 tive septa (Pl. XV. fig. 3 R), which are strongly promi- 

 nent, owing to their intraseptal space being very wide. ' 



10* 



