44 



Omkring Mumien er en bleg, gulhvid, smal Ring. hvorfra 

 udgaa blege Straaler til den indre Tentakelrække, Tab. III, 



Fig. 4. 



Hele Legemet er udvendigt beklædt med et Ectoderm, 

 bestaaende af lange, oilierende Cylinderceller, hvorimellem 

 tindes en Mængde encellede Slimkjertler og Nematoeyster. 

 Indenfor Ectodermet er et tyndt. fibrillært Bindevævslag, 

 paa hvis indre Flade sees cirkulære Muskler, der danne 

 tine Bundter, indesluttede i særskilte Bindevævsrum. Binde- 

 vævet er forresten rigt paa Bindevævslegemer med (hues 

 Kjærne samt fine Saftkanaler. 



Der er li Par principale. fuldstændige Septa, hvoraf 

 2 Par ere Retningssepta, der følge Gonidiegrubernes Ret- 

 ning og ere forsynede med saavel transverselle som lon- 

 gitudinelle Muskler; di' første beklæde som en Lamel de 

 indre Fladei*. det vil sige dem. der vende mod hinanden, 

 de sidste derimod de ydre Flader, hvor de ligeledes ud- 

 brede sig membranagtigt. Paa, de øvrige 4 Septapar ere 

 Muskellagene placerede omvendt, saaledes nemlig, at de 

 longitudinelle Muskler beklæde de indre Flader, som vende 

 mod de intraseptale Rum, og de transverselle de ydre. 

 Ihvorvel disse Muskellag ere temmelig tydelige, indtage de 

 dog ikke nogen Tykkelse. Disse 6 Par Septa ere golde, 

 de staa langt fra, hverandre, baade hvert Par indbyrdes 

 og det ene Par i Forhold til det andet. Derfor ere ogsaa 

 saavel de intraseptale som interseptale Kum (Kamre) 

 meget vide. især gjælder dette de sidste. 



I ethvert af de interseptale Kamre er der 3 Par 

 ufuldstændige Septa, hvoraf det midterste Par er det længste, 

 men selv dette rager kun lidt over en Trediedel ind i 

 Hovedkamnieret. imedens de to andre ere eiidnu kortere. 

 Hovedkamrene, det vil sige de 6 interseptale Ruin. som 

 fremkomme ved de ti Par principale Septa, ere derfor 

 ualmindelig rummelige, ja rummeligere end jeg hidtil har 

 observeret hos nogen anden Actinie. Det midterste Septa- 

 par har sine longitudinelle Muskler paa den indre Flade; 

 de vende altsaa mod hverandre, imedens de transverselle 

 Muskler ligge paa de ydre Flader; dette Septapar af 2<*en 

 Orden er ligeledes goldt, men bærer Meseiiterialfilamenter 

 og Acontier. De øvrige 2 kortere Par synes at have 

 Muskellaget modsat, idet de longitudinelle Muskelfibre be- 

 klæde den ydre og de transverselle den indre Flade. saa- 

 ledes som Tilfældet er med de to Retningssepta. Disse 

 2 korte Septapar bære Generationsorganerne, hvori sees 

 Æg i forskjellige Utviklingsstadier. Imellem hvert 2 af 

 samtlige Septapar iagttages 2 yderst rudimentære Septa, 

 der vise sig som smale, listeformige Fremspring, som 

 strække sig fra Fod- til Mundskiven og ere beklædte med 

 Længdemuskler paa den ene og Tvermuskler paa den 

 anden Side. De 6 Par principale, fuldstændige Septa 

 have, hvor de inserere sig paa Fodskiven, en meget stor, 



are paler, and in the outermost series pale whitish-red. 

 Round the mouth there is a pale, yellow-white, liarrow 

 annulus, from which pale ravs issue to the inner tentacular 



series (Pl. III, fig. 4). 



The entire body is. exteriorly, clad with an ectoderm 

 consisting of long, ciliating cylinder-cells, between which a 

 multitude of unicellular nmcous glands and nematocysts 

 are observed. Inside of the ectoderm there is a tliin. 

 fibriUar laver of connective-tissue on whose inner-surface 

 circular muscles are seen, which form fine fasciculi enclosed 

 in separate connective-tissue spaces. The connective-tissue 

 is, otherwise, rich in connective-tissue corpuscles with their 

 nuclei, and also fine nutritory ducts. 



There are (i pairs of principal, perfect septa, of which 

 2 pairs are directive septa that follow the direction of 

 the gonidial grooves and are furnished with both trans- 

 versal and longitudinal muscles. The first-named clothe, 

 as a lamella, the inner surfaces, that is to say. those that 

 face towards each other; the lasfc-named, on the contrary, 

 clothe the outer surfaces, where thev likewise distribute 

 themselves membranaceously. On the other 4 pairs oi 

 septa, the musculous lavers are placed in reverse manner, 

 the longitudinal muscles clothing the inner surfaces, which 

 face towards the intraseptal spaces, while the trans 

 versal muscles clothe the outer surfaces. Adthough these 

 muscular layers are rather distinct, still they do not occupy 

 much of the thickness. These 6 pairs of septa are sterile; 

 thev are placed far apart from each other. both each pair 

 as between themselves, as well as the one pair in relation 

 to the other. The intraseptal as well as the interseptal 

 spaces (chambers) are, therefore, verv wide, and that is 

 espeeiallv the case with the last-named. 



In each of the interseptal chambers there are .'! pairs 

 of imperfect septa. of which the intermediate pair is the 

 longest, 1 uit even that pair onlv extends a little more than 

 a third part into the principal chamber, while the two 

 others are even shorter. The principal chambers, that is 

 to say^the 6 interseptal spaces produced by the li prin- 

 cipa.1 septa, are, therefore. unusually roomy, indeed more 

 so than I have hitherto ever observed in anv other 

 actinia. The intermediate pair of septa has its longitud- 

 inal muscles on the inner surface; they face therefore 

 towards each other, while the transversal muscles are 

 seated on the outer surfaces. This pair of septa of the 

 2nd order are likewise sterile, but carry mesenterial fila- 

 ments and acontia. The remaining 2 shorter pairs of septa 

 appear to have the muscular laver reversed, as the longi- 

 tudinal muscles clothe the outer and the transversal 

 muscles the inner surface, in same manner as with the 2 

 directive septa. These 2 short pairs of septa carry repro- 

 ductive organs in which ova are observed in various 

 stages of development. Between each 2 pairs of all the 

 septa 2 extremely rudimentary septa are observed. which 

 present themselves as narrow, fillet-formed prorainences, 

 that extend themselves from the pedal to the oral disc, 

 and are clad with longitudinal muscles on the one and 



