16 



Aplidium flavum, n. sp. 



Cornuis lideii, Idlcformig tilspidset nedad med en 

 længde af indtil 2 cm. og en bredde af indtil 1 cm. Kolo- 

 nierne levede paa kalkalger og døde skjæl, med sin nedre 

 del indklemt i sprækker eller trange aabninger, hvorved 

 formen blev meget nregelmæssig. Kalkpartikler og skjæl- 

 tragmenter incrusteredes altid især ved basis. 



Den fælles tunica transparent, farvelos med de gul- 

 Innine individer skinnende igjennem. 



Individernes længde indtil 4""", l)redde omtr. O..^""". 



Ingestionsaabningen med 6 korte tænder. 



Branchialsækken var saa stærkt contraheret at stig- 

 mata og antal rækker ikke lod sig sikkert tælle. Disse lod 

 til at være omtr. 12. 



Ventrikelen med 8 longitudinelle folder. 



Postabdomen udgjør omtr. intlividets halve længde 

 med faa store i en enkelt rad liggende æg. 



Denne art tandt jeg meget alm. i juli maaned ved 

 Gjesvær i en dybde af 20—35 favne. 



AmarOUCium, Milne-Edwanls, 1842. 

 Attiarouciuni proliferum, M.-Edw., 1842 



1842. Aniardiichini ijroltjcnim. M.-Ed\v. (Jbserv. sur les 



Ase. comp. des cotes de la Manche. 



Mem. acad. sei. t. XYIIl. 

 1877. Aniarmiciuiii rofieiivi, Dclla Valle. C'ontril)uz. alla 



storia nat. delle Ase. comp. del 



golfo di Napoli. 

 1890. Anmyoneinm pniliferum (typef.). Lahille. Recherches 



sur les tuniciers des cotes de 



France, p. 222. 



Forekom i koUedanncde, ofte drueklaseformige corrai, 

 hvoraf hver enkelt kolle havde en diameter af 3 — 20""". 

 De fundne cormi repræsenterede typeformen : ..individerne 

 med 10—12 Ijranchialstigmata. den fælles tunica pomei-ants- 

 gul med de gjennemskinnende individei's branchialsække 

 høirode". I juni — ^juli maaned var postabdomen i næsten 

 alle cormi fulde af stoi-e ])runviolette æg. Meget sjelden 

 forekom ved denne tid kno[)per i de tidligere stadier. 



Cormi med afvigende farvetegninger blev undertiden 

 paatrufne: ensfarvet skiddengule; undertiden var individernes 

 øvre af kolonien noget fremstikkende del hvidagtig. 



Denne art fandt jeg almindelig ved Espevær i en 

 dybde af 4 — 8 favne. Kolonierne var hyppigst fæstede til 

 hydroider og laminariestilke. 



Aplidium flavum, n. sp. 



The cormus is small, wedge-shaped. pointed below, 

 with a maximum length of 2 cm. and a breadth of 1 cm. 

 The colonies were living on calcareous algæ and dead shells, 

 with their lower portions squeezed into cracks or narrow 

 openings, whereby the shape had become very irregular. 

 They were always incrusted with calcareous particles and 

 fragments of shell, especially at the base. 



The common tunic is colourless and transparent, with 

 the yellowish Iirown members showing through. 



The maximum length of the memliers is 4'""', breadth 

 about O..')'"™. 



The branchial aperture has <3 short denticles. 



The branchial sac was so greatly contracted that it 

 was impossible to count the stigmata or the number of 

 rows with any certainty. The latter appeared to be about 12. 



The ventricle has 8 longitudinal folds. 



The post-abdomen constitutes aliout half the length 

 of the menil)er, and contains a few large ova in a 

 single row. 



I found this species very common dnring July at 

 Gjesvær, at depths of from 2() to 35 fathoms. 



Araaroucium, Milue-Edwavls, 1842. 

 Amaroucium proliferum, M.-Edw., 1842. 



1842. AniayoHcinm prolife)'iim, M.-Edw. Observ. sur les 



Ase. comp. des cotes de la Manche. 



Mem. acad. sei. t. XVIII. 

 1877. Anmroncimn rosenm. Della Valle. Contribuz. alla 



storia nat. delle Ase comp. del 



golfo di Na])oli. 

 1890. Anxirouriiim lyrolijcnint (type), Lahille. Recherches 



sur les tuniciers des cotes de 



France, p. 222. 

 Oeeurred in elub-shaped often botryoidal cormi. in 

 whicli the diameter of the various lumps measured from 2 

 to 20""". The cormi found were representatives of the 

 type-forni, ..the members liaving from 10 to 12 branchial 

 stigmata, the common tunic heing of an orange yellow 

 colour, with the bright red branchial sacs of the members 

 showing through". In .June and .Tuly the postabdomen 

 in nearly all the cormi, was full of large, brownish purple 

 eggs. Buds in the earlier stages very seldom oeeurred at 

 this time. 



Cormi of different colours were sometimes met with, 

 e. g. a uniform dull yellow; and sometimes the upper part 

 of the members, which projected somewhat from the sur- 

 face of the colony, was whitisli. 



I found this species common at Espevær at depths 

 of from 4 to 8 fathoms. The colonies were most frequently 

 attached to hydroidæ and Laminaria stalks. 



