120 



til at udtale mig, saa har man to Par Retningssepta og, 

 til hver Side af disse, 8 Septapar, ethvert dannet af 1 Macro- 

 og 1 Microseptum, hvilket jo er det almindelige for Zoan- 

 thiderne. Samtlige Macrosepta bære Mesenterialfilam enter 

 og Generationsorganer, der som oftest indtage en saadan 

 Bredde, at de ganske skjule Microsepta, Tab. XXII. Fig. 4. 



Paa et Tversnit af Kroppen viser Huden sig at 

 beståa af et ydre Epithel (Ectoderm), som er dannet af 

 temmelig hoie Cylinderceller med sin Kjerne og Kjerne- 

 legeme. men uden Cilier, Tab. XXI, Fig. 16 a, 18 a, 

 imellem hvilke Nematocyster ere indleirede. Indenfor 

 Ectodermet er et megel bredt Bindevævslag, der danner 

 et fuldkomment Net med sture Masker, som ere fyldte 

 med Sandkorn, Tab. XXI Fig. 18 b. Størstedelen af 

 Bindevævet er mkrusteret ; kun nærmest Ectodermet og 

 Endothelet er et Belte, som er kompakt, uden Masker, 

 Tab. XXI. Fig. 18 b. Saavel i Bindevævsbjelkerne, der 

 danne Nettet, Tab. XXI, Fig. 18 c, som i de omtalte 

 Belter, sees Bmdevævslegemer, dels stjerneformede, dels 

 spindelformede med Kjerne og Kjernelegeme ; men foruden 

 dem sees større og mindre, fordetmeste arlange Kanaler, 

 der ere mere eller mindre fyldte med Epithelceller. og sum 

 sandsynligvis ere Ernæringskanaler, Tal). XXI, Fig. 16 b. 

 De synes at svare til de af Dr. Erdmann omtalte 

 „Zellinseln. Zellhøfen", og som tindes hyppigt hos Zoan- 

 thiderne. 



Mesodermet (Bindevævet) i den ydre Hud er saaledes 

 for en stor Del udfyldt af Kanaler, hvori som tidligere 

 omtalt er indleiret større og mindre, uregelmæssige Sand- 

 korn, Tab. XXI, Fig. 18 /. der ligge saa tret sammen, 

 at de saagodtsom danne et Pantser. I Bindevævsbeltet, 

 nærmest Endothelet, sees cirkulære Muskelfibre, iler ikke 

 synes at være meget udviklede, Tab. XXI. Fig. 18 g. 

 Dr. Erdmann angiver for sin navnløse Slægt, at Ring- 

 musklerne ere mesodermale; hos Mardæll udgjør Største- 

 parten af Mesodermet et retikulært Kanalsystem, saa det 

 er rimeligt, at Ringmuskelen hos den maa være endodermal, 

 med andre Ord, der er ikke Plads for den andetsteds end 

 i det indre Bindevævsbelte. nærmest Endothelet. Paa den 

 indre Væg af Bindevævet ligger et Muskellag, der dannes 

 af Tver- og Længdemuskler, Tab. XXI, Fig. 18 h. som 

 beklædes af et Endothel. bestaaende af meget hoie, cilier- 

 ende Cylinderceller. der tungeformigt rage ind i Gastro- 

 vascularhulheden. Tal). XXI. Fig. 1G r. 18 i. 



Fra Bindevævets indre Væg udsendes listeformede 

 Bindevævsprolongationer, som danne de for aævnte Septa. 

 Macrosepta, hestaar saaledes af et Midtparti, der er Binde- 

 vævsmembranen (Støttemembranen, Stiitzlamelle), som er 

 temmelig smal. men bliver noget bredere henimod Inser- 

 tionen paa Svælgrøret, Tab. XXT. Fig. 16 </. 18 /,-. Paa 

 denne Membran er placeret baade Tver- og Længdemuskler. 

 Imedens Tvermusklerne ere lidet udviklede, ere Længde- 



in regard to which I will subsequently speak — we have. 

 then, two pairs of directive septa. and on each side of 

 them 8 pairs of septa, each pair formed of 1 macro and 

 1 micro septum. which, indeed, is the common case in Zoan- 

 thidæ. All the macrosepta carry mesenterial filaments and 

 reproductive organs which. most frequently, occupy such a 

 breadtb, that theyfquite conceal the microsepta (Pl. XXII. 

 fig. 4). 



In a section of the body the integument shows itself 

 to consist of an outer epithelium (ectoderm), which is 

 formed of rather high cylinder-cells with a nucleus and 

 nucleus-corpuscle, but without ciliæ (Pl. XXI, fig. 16 <i. 

 is ( ( . between which nematocysts are entrenched. On the 

 inside ot the ectoderm there is a laver of very broad 

 connective-tissue , which forms a complete reticulation, 

 with large meshes that are filled with grains of sand (Pl. 

 XXI, fig. 18 b). The greater part of the connective-tissue 

 is encrusted, only next to the ectoderm and the endo- 

 thelium is there a belt which is compact and without meshes 

 (Pl. XXI. fig. IS b). Both in the connective-tissue ribs 

 tbat form the reticulation (Pl. XXI. fig. 18 c) as well as 

 in the belts referred to. connective-tissue corpuscles are 

 seen. partly stelliform, partly fusiform, with nucleus and 

 nucleus corpuscle ; lint besides them. larger aud smaller, 

 principally oblong, ducts are observed, filled more or less 

 with epithelial cells, and which probably are nutritory 

 ducts (Pl. XXI. fig. 16 b). They appear to correspond 

 to the „Zellinseln, Zellhøfen" spoken of by Dr. Erdmann. 

 and which are freijuently found in the Zoanthids. 



The mesoderm (the connective-tissue) in the outer 

 integument is. tims. in a great measure filled with ducts, 

 in which. as previously stated, larger and smaller irregular 

 grains of sand are entrenched (Pl. XXI. fig. 18 /), lying 

 so closely to each other that they almost form a plating. 

 In the connective-tissue belt. next the endothelium, cir- 

 cular muscle fibres are observed, which do oot appear to 

 be much developed (Pl. XXI. fig. is g). Dr. Erdmann 

 states in regard to his nameless genus, that the annular 

 museles are mesodermal; in Mardæll the greater part of 

 the mesoderm consists of a reticular ductiferous system, 

 so that it is probable the annular muscle in it must 

 be endodermal; in other words. there is no room for it 

 elsewhere than in the inner connective-tissue belt next 

 the endothelium. Upon the inner wall of the connective- 

 tissue there lies a muscular laver, formed of transversal 

 and longitudinal museles iPl. XXI. rig. IS J n that are 

 clothed with an endothelium consisting of very high eiliating 

 cylinder-cells. which extend in linguiform into the gastro- 

 vascular cavity (Pl. XXI. fig. Hi r. is /,. 



From the inner wall of the connective-tissue fillet- 

 fornied [connective-tissue prolongations are projected. forming 

 the previously mentioned septa. The macrosepta consist, 

 thus, of a medial portion, which is the connective-tissue 

 membrane (the supporting membrane, stiitzlamelle), and is 

 rather narrow, but becomes somewhat broader towards the 

 insertion on the gullet-tube (Pl. XXI, fig. 16 d. 18 k). 

 Upon this membrane there are placed both transversal 



