34 



er afrundet, jævn og kan trækkes over Mundskiven, som 

 den da skjuler. 



Mundskiven er rund. lidt hvælvet og forsynet med 

 tine Folder, der straale ud fra Munden mod Peripherien. 

 Munden er aflang med foldede Læber og to Gronidiegruber, 

 Tab. X, Fig. 10. Tentaklerue ere retraktile, sidde i 3 

 Rækker, ere temmelig korte, men tykke og forsynede med 

 en tin Aabning i Spidsen. Den første — inderste — Række 

 har 18, som ere de tykkeste og længste; den anden — mel- 

 lemste — Række, der alternerer med den forste. har ligeledes 

 18, som ere lidt tyndere og kortere, end de i inderste; 

 men den tredie — ■ yderste — Række har 18 — 20, der 

 staa lige ved Kroppens overste Rand, Tab. IV. Fig. 12; 

 Tab. X, Fig. 10. Som nysnævnt ere Tentaklerne vel 

 retraktile, men Retraktionen sker ualmindeligt langsomt; som 

 oftest boies de kun ind mod Mundaabningen, idet Krops- 

 randen trækker sig over Mundskiven og skjuler saavel 

 denne som Tentaklerne. Tab. X, Fig. 0» u. 



Farven. Kroppen er bleg rosenrød, men stæfkt 

 iriserende; dens overste Rand er noget mørkere rod. 

 Mundskiven ei' ligeledes rosenrød, spillende lidt i det 

 Gule. Omkring Munden er en høirød Ring, hvorfra ud- 

 straale høirøde Striber til Tentaklerne. Disse ere bøirøde, 

 Tab. IV, Fig. 12. 



Hele Legemet er udvendigt bekkedt med et Ectoderm, 

 der bestaar at' lange, eilierende Cylinderceller med Kjerne 

 og Protoplasmaindhold, Tab. X, Fig. 12 r. Imellem Cylin- 

 dercellerne tindes en Mængde spredte, encellede Slimkjert- 

 ler. der ere rigest paa Mundskiven. samt Nematocyster. 

 Disse ere i storst Mængde paa Tentaklerne. Indenfor 

 Ectodermet er et meget bredt, tibrillært Bindevæv, forsynet 

 med Bindevævslegemer med og uden Udløbere, samt tiur 

 Ernæringskanaler. Tab. X. Fig. 12 a. Omtrent i Midten 

 af dette Bindevæv sees cirkulære Muskelfibre, der danne 

 Bundter og ligge ligesom i 3 Belter med Bindevæv imel- 

 lem; Forbindelsen imellem disse 3 Helter synes at være 

 yderst sparsom; men fra det inderste Belte udgaa enkelte 

 Fibre henimod Bindevævets indre Flade, der dækkes at' 

 Endothelet. Tab. X. Fig. 12 </. Paa et andet Præparat 

 ere disse 3 Belter smeltede [sammen |til et, Tab. X, Fig. 

 li' b. De radiære Muskler ere især udviklede paa Mund- 

 skiven, hvor de sees i tætte Bundter. temmelig nær Ecto- 

 dermet. Paa Tentaklerne ere de longitudinelle Muskler fuld- 

 stændie ectodermale. 



Der er 8 Par fuldstændige Septa, hvoraf de 6 Par 

 ere principale og golde med 2 Par Retningssepta, Tab. X. 

 Fig. 11. R, R. og to Pai- secundære, bærende Acontier. 

 Der er kun liden Forskjel paa disse Septa. som samtlige 

 bære Mesenterialfilamenter ; men imedens de antagelig 

 principale Septa synes at have en stærkere Muskulatur 

 og ere forresten nøgne, Tab. X. Fig. 11. 1. iagttages paa 

 de to Par sekundære Septa. Tab. X. Fig. 11. 2. mindre 



mother-of-pearl lust mus external surface, and its upper- 

 most margin is rounded, even, and capable of being drawn 

 over the oral disc. whieh is then concealed by it. 



The oral disc is round, a little arcuate, and furnished 

 with tine folds which radiate from the mouth towards the 

 periphery. The mouth is oblong with folded labiæ and 

 2 gonidial grooves (Pl. X. rig. 10). The tentacles are 

 retractile, placed in 3 series, are rather short. but thick. 

 and are furnished with a minute orifice at the point. The 

 innerniost (hrst) series contains 18 tentacles, these are 

 the thickest and longest ones: the intermediate (second) 

 series has also 18 tentacles which alternate with those of 

 the first series, and are a little thinner aud shorter than 

 those of the first serie-; but the outermost (third) series 

 contains 18 — 20 tentacles, placed exactly at the uppermost 

 margin of the body (Pl. IV. fig. 12. Pl. X. fig. 10). As 

 just stated, the tentacles are indeed retractile. but their 

 retraction proceeds extremely slowly; must frequently they 

 only involve towards the oral aperture, as the margin ut' 

 the body draws itself over the oral disc and eoneeals 

 both it and the tentacles (Pl. X. tig. 1<) a). 



The colour. The body is pale rose-red but strongly 

 irridescent; its uppermost margin is somewhat darker red. 

 The oral disc is likewise ruse-red. shading a little to yellow. 

 Round tlie mouth there is a bright red annulus from which 

 bright red stripes radiate to the tentacles. The latter are 

 bright ivd. (Pl. IV. rig. 12). 



The entire body is covered, exteriorly, with an ecto- 

 derm. consisting ut' long, ciliating cylinder-cells with nucleus 

 and protoplasmic contents (Pl. X, fig. 12 c). Between the 

 cylinder-cells, a multitude of scattered, unicellular mucous 

 glands me fiound, which are most abundant on the oral disc, 

 also nematocysts. These are found in greatest abundance 

 nu the tentacles. Inside of the ectoderm there is a very 

 broad, fibrillar, connéctive tissue furnished with connective- 

 tissue corpuscles with and without prolongations. also minute 

 nutritory ducts (Pl. X. fig. 12 a). At about the middle 

 of this connéctive tissue. circular muscle-fibres are seen, 

 forming fasciculi, and Iving .-is it' in 3 belts, with connective- 

 tissue between them; any connection between those 3 helts 

 appears tu be extremely slight. but from the innermost 

 belt a few fibres issue towards the inner surface of 

 the connective-tissue which is covered by the eiidotheliuni 

 (Pl. X. fig. 12 d). In another prepared specimen those 3 

 belts appear merged into one (Pl. X. fig. 12 6). The radi- 

 ary muscles on the oral disc are especially well developed, 

 and are seen lying in compact fasciculi rather close to 

 the ectoderm. On the tentacles, the longitudinal muscles 

 are perfectly ectodermal. 



There are 8 pairs of perfect septa. of which (i pairs 

 are principal ones and sterile, and 2 pairs are directive 

 septa (Pl. X. tlg. 11 R. R.); there are also two pairs of 

 secondary septa, carrying acontia. There is not much dif- 

 ference between those septa. as :ill of them carry mesen- 

 terial filamenfs; but whilst the presumably principal 

 septa appear to have a more powerful musculosity, and 

 are. besides, bare (Pl. X. rig. 11. 1). there are seen on 



