** 



begyndte atter Befæstningsarbeidet paa den tidligere om- 

 talte Maade. 



Paa den øverste, nøgne Del (Capitulum) iagttages hos 

 flere Exemplarer en snyltende Brvozoa, der sandsynligvis 

 er ny. og som senere vil blive beskrevet af Professor G. 

 Ossian Sårs. der har Nordhavsexpeditioiiens Bryozoer til 

 Bearbeidelse. Hele den nøgne, eylindriske Del var paa 

 enkelte Exemplarer tæt besat med Snylteren. Tab. XI, Fig. 

 1 il. der maatte finde sig i at drages ind i Scapus, saa 

 ofte Capitulum tråk sig sammen; og da Andvakia kunde 

 holde sig sammentrukken i flere Dage under sit Fangen- 

 skab, var Bryozoen i den Tid fuldstændig arresteret. 



Farven. Den inkrnsterede Del er brunsort med 

 isprængte dels hvide, dels grønne og rødlige Punkter. Den 

 øverste, nøgne, eylindriske Del er svag laxerod. stundom 

 ganske hvid med et fint Rosenskjær. Mundskiven sinnober- 

 rød med fine, mørkere Linier. Tentaklerne samme Farve 

 som Mundskiven. men lidt mørkere ved Roden og lysere i 

 Spidsen. Tåges Krusten bort. er den underliggende Hud 

 hvid, og da sees med Lethed Insertionerne af Septa, hvilket 

 især er fremtrædende i Physa, naar denne er udspændt, 

 Tab. XI, Fig. 1 c, 2 c. 



Hudens Bygning afriger ikke særdeles meget fra 

 Actiniernes i Almindelighed, især gjælder dette' Slægten 

 Phellia. Et Tversnit af den inkrusterede Del (Scapus) 

 viser, at udenpaa det egentlige Ectoderm er der et Lag 

 meget seigt Slim. hvori de mineralske Bestanddele ere tæt 

 indleirede, Tab. XI. Fig. 5, ti a. Dette Krustelag er flere 

 Millimeter bredt og temmelig fast adhæreret til Epithelet, 

 saa at det vanskeligt lader sig fjerne uden ved Skrabning. 

 men Dyret kan delvis skille sig ved det, dog reprodu- 

 ceres det snart. Epithelet er paa enkelte Steder ligespm 

 forkrøblet; men i det Hele tåget bestaar det af lange 

 Cylinderceller med en forholdsvis liden. aflang Kjerne og 

 et temmelig fattigt Protoplasmaindhold, Tab. XI. Fig. 5 b, 

 (i b. Imellem Epithelcellerne iagttages en Mængde encel- 

 lede, flaskeformede Slimkjertler, der udmunde paa Qver- 

 fladen, og sum afgive den seige Slim. hvori de fremmede 

 Legemer ere inkrusterede. Mange af disse Slimkjertler 

 ere fuldproppede af en mørkladen, finkornet Masse, der 

 ganske skjuler Kjernen: andre have et meget tyndere Ind- 

 hold, ere klarere, saa at Kjernen tydelig kan sees. og atter 

 andre ere ganske tomme og ligne Vaeuoler. Paa den 

 øverste, nøgne Del (Capitulum) ere Epithelcellerne længere, 

 forsynede med lange Cilier, og her iagttages foruden Slim- 

 kjertlerne tillige talrige Nematocyster. 



Indenfor Ectodennet er overalt et bredt, fibrillært 

 Bindevævslag, Tab. XI. Fig. ."> c, 6 c, som henimod dets 

 indre Flade er forsynet med stærke, cirkulære Muskelfibre. 

 Tab. XI. Fig. f)-/, r,,/, der beklædes tildels af Endothelet. 



the complete animal now lav. and attempted, by contrac- 

 tions and vermicular movements of the whole body. to 

 change situation, which was also snccessful. Now began 

 again the work of securing itself. in the same manner 

 as previously mentioned. 



Upon the uppermost bare part (capitulum) there was 

 observed. in several specimens. a parasitic Brvozoa. which 

 probably is new. and will subsequently be described by 

 Professor G. Ossian Sårs, who has the Brvozoa of the 

 North-Atlantie Expedition under investigation. The entire, 

 bare, cylindrical part was. in some specimens. closely eov- 

 ered with the parasite (Pl. XI. fig. 1 d), which were obliged 

 to submit to being drawn into the scapus every time the 

 capitulum contracted itself. and as the Andvakia in its 

 confinement may remain contracted for several days, the 

 Brvozoa were during that time completely shut in. 



Tlie Colour. The encrusted portion is brown-black 

 with partly white, partly green and reddish dots. The up- 

 permost, bare, cybndrical portion is fainj salmon-red colour, 

 occasionally quite white with a fine rose tinge. The oral 

 disc is cinnabar-red with fine darker coloured lines. The 

 tentacles have the same colour as the oral disc. but are 

 a little darker at the root and ligther coloured at the 

 point. Wben the crust is removed the integument under- 

 neatli is white, and the insertions of the septa are easily 

 observed, and are especially prominent in the physa when 

 it is expanded (Pl. XI. fig. 1 r. 2 c). 



The structure of the integument does not differ very 

 mucli trom that of the Actinaria in general, and especially 

 from that of the Phellia genus. A transversal section of 

 the encrusted portion (scapus) shows, that outside tin- real 

 ectoderm there is a laver of very viscid mucous. in which 

 the mineral substances are closely embedded (Pl. XI. fig. .">. 

 (i a). This crust-layer is several millimetres broad, and 

 rather firmly adhereht to the epithelium. so that it is with 

 difficulty reitnoveable except by scraping it off; the animal 

 can. however, to some extent east it. but it is soon repro- 

 duced. Tin' epithelium appears in some places as if it 

 were deformed, but, tåken generally, it consists of long 

 cylinder-cells with a relatively small, oblong nucleus, and 

 a rather poor protoplasmic contents (Pl. XI. figs. 5 b. 6 b). 

 Between the epithelial cells a multitude of unicellular, 

 bottle-shaped mucous glands are observed, which open on 

 to the outer surface and supply the viscid mucous in which 

 the foreign bodies are encrusted. Many of these mucous 

 glands are quite stuffed with a darkly coloured. tine gran- 

 ular mass that quite conceals the nucleus; others, again. 

 have a much thinner contents. are more pellucid, so that 

 the nucleus can be distinctly seen. and. again, others are 

 quite empty and resemble vacuoli. Upon the uppermosl 

 bare jtart (capitulum) the epithelial cells are longer and 

 are furnished with long eiliæ, and here numerous nemato- 

 cysts. besides the mucous glands, are also observed. 



Inside of the ectoderm. there is. every where, a broad . 

 fibrillar laver of connective-tissue (Pl. XI. figs. 5 c, ii c) 

 which, towards its inner surface. is furnished with strong 

 circular muscle-fibres (Pl. XI. fig. 5 </. ti ih. clothed, to 



