wtmm 



4,| ^MiHHHH 



M. normani*). Man ser ogsaa tildels, at en kitintube 

 forløber langs en bifurkation paa samme maade, som frem- 

 stillet af Norman (Notes on rare British Polyzoa, Quar- 

 terly Journ. Mic. Sc, vol. 8, n, s>, tab. 5, fig. 6). Mel- 

 lem rodtraadene (tubular fibres, radical åbres) hos M. ter- 

 nata og kitintuberne hos de to andre arter er der neppe 

 nogen anden forskjel end. at de hos den første udspringer 

 under en ret vinkel, mens de hos M'. Jeffrey sii og M. nor- 

 mani udspringer saa spidsvinklet, at de løber efter zoariet, 

 for hvilket tuberne saaledes tjener som et effektivt støtte- 

 apparat. 



Fra M. Jeffrey svi adskilles min art let ved sine store 

 frontavicularier og manglende operculum. 



Det kan have sin interesse at stille sig for øie de 

 naturlige forhold paa de tre steder, hvor arten forekom: 



St. 31, 763 ra'., sandler, t= ~ l.°0 C. 



„ 200, 1134 - , ler , t-= ~ l.°0 - 



„ 323, 408 - , ler , t = l .05 - 



Den er saaledes hentet op fra et dyb af 1154 meter 



med iskoldt vand, og sammen med Kinetoskias aroorescens 



deler den æren af at have levet i en afstand fra sjøens 



overflade som er større end 1000 meter. 



Koloniernes længde 3 — 6.5 cm. 



Zoociemundingens længde 0.3 mm. 



bredde 0.14 „ 



Frontaviculariets længde 0.24 — 0.3 „ 

 Kitin tubernes tykkelse 0-030 — 0.06 „ 



Gen. Scnipocellaria. 



Scrupocellaria reptans, Linn. 



Cellularia reptans, Smitt, (24, III), p. 284, 318, tab. 17, 



fig. 37—41. 

 Scrupocellaria reptans, Hincks, (8)- p. 52, tab. 7, fig. 1—7. 



Findested. Brandøsund. 



Denne art vides ikke med sikkerhed at være obser- 

 veret i den arktiske del af vort land. M. Sårs (22) op- 

 fører vistnok Cellularia reptans som almincleligt forekom- 

 mende i Havøsund og ved Hammerfest, men det foreligger 

 sandsynligvis her en forveksling med Menipea temata. 

 Baade Norman og jeg har tåget arten i Trondhjemsfjorden, 

 men nordenfor er den endnu ikke funden. 



*) J min fortegnelse har jeg tydet disse kitintuber som hydroid- 

 rør (18, TJ, p. 11, tau. 2, fig. f>). Dette er nok ikke rigtigt, 

 Vistnok finder man ofte ogsaa ledsagende hydroider saaledes 

 som angivet paa min ovenciterede figur, men de egentlige 

 kitintuber udspri ger baade hos M. normani og M. jeffreysii 

 fra zoociernes nederste parti, og de maa saaledes knnne opp- 

 fattes som svarende til rodtraadene hos M. temata. 



and M. normani*). A chitinous tube may also sometimes 

 be seen running along a bifurcation in the way described 

 by Norman (Notes on Rare British Polyzoa. Quarterly 

 Journ. Micros. Sci., Vol. 8, n. s. PI. V, fig. 6). There 

 is hardly any difference between the radical fibres in M. ter- 

 nata, and the chitinous tubes in the two other species, 

 except that in the first they spring out at right angles, 

 while in M. jeffreysii and M. normani they spring out at 

 such an acute angle that they follow the zoarium, and thus 

 serve as an effective support. 



My species is easily distinguished from M. jeffreysii 

 by its large anterior avicularia and the absence of an 

 operculum. 



It may be interesting to observe the natural condi- 

 tions in the three places where the species occurred. These 

 were as follows: 



St. 31, depth 763 m., sandy clay, temp. — 1.0° C. 

 „ 200, „ 1134 - , clay , „ —1.0° - 

 „ 323, „ 408 - , clay , „ 1.5° - 



It has thus been brought up from a depth of 1134 

 metres, from ice-cold water; and it shares with Kinetoskias 

 arborescens the honour of having lived at a distance of 

 more than 1000 metres below the surface of the sea. 

 Length of colony from 3—6.5 . cm. 



Length of the aperture 0.3 mm. 



Breadth of the ,. 0.14 - 



Length of anterior avicularium from 0.24 — 0.3 

 Thickness of chitin tubes from 0.036 — 0.06 - 



Gen. Scrupocellaria. 



Scrupocellaria reptans, Linn. 



Cellularia reptans, Smitt (24, III), pp. 284, 318; PL XVII, 



figs. 37—41. 

 Scrupocellaria reptans, Hincks (8), p. 52; PL VII, figs. 1—7. 



Occurrence. Brandøsund. 



This species is not known with certainty to have 

 been observed in the arctic portion of Norway. M. Sars 

 (22), indeed, specifies Cellularia reptans as of common oc- 

 currence in Havøsund and at Hammerfest; but this is 

 probably through confounding it with Menipea temata. 

 Both Norman and I have found the species in the Trond- 

 hjem Fjord, but farther north it has not yet been found. 



Jn my list, I have interpreted these chitinous tubes as hydroid 

 tubes (18, II, p. 11; Pl. IJ, fig. 5). This is not correct. It 

 is true that accompanying hydroids are often found as repre- 

 sented in my above-mentioned figure; but the true chitin tubes, 

 both in M. normani and M. jeffreysii, spring from the lowest 

 portion of the zoæcia, aud might thus be supposed to answer 

 to the root fibres in M. ternata. 



