Forbindelse med de fine Saftkanaler, Tab. IL Fig. 1, d, 

 saa at der i selve Grundmassen for den hele Dyrekoloni 

 er et ri o-t Saftomløb. 



Paa den ydre Flade af Bindevævslaget, in den for 

 Ectodermet, er leiret en stor Mængde Spikier, der ligge 

 tæt til kverandre og danne væsentligt tornede Dobbelt- 

 kugler med et noget indknebet Midtparti Tab. I, 

 Fig. 8. 9; de ere 0.160""" lange, Enderne 0.100™'" brede og 

 Midtbeltet 0.032""" bredt. Kun enkeltvis træffes flerdobbelt 

 sammensatte Stjerner, 0.180""" lange, 0.120""" brede fra 

 Straalespids til modsat Straalespids, Fig. 10. Paa den mem- 

 branagtige Udbredning af Basaldelen, hvori findes en stor 

 Mængde saavel Længde- som Tverkanaler, dannende et 

 sammenhængende Net med store Masker, er Bindevævet ud- 

 fyldt af simple, smaa Dobbeltstjerner, 0.048""" lange, 0.040'"™ 

 brede i Enderne, Fig. 11. 12. Spiklerne ligge her hobevis 

 paa hverandre. 



Fra den indre Flade af Stammens brede, hyaline 

 Bindevævslag udløbe Forlængelser, som ere temmelig smale 

 og forbinde sig med hverandre, hvorved Længdekanalerne op- 

 staa og det egentlige Coenenchym dannes. Disse Længde- 

 kanaler ere temmelig vide, især gjælder dette de ydre, der 

 løbe igjennem Stammens hele Længde, og paa hver Kanals 

 Vægge er der 8 Septula, som følge hele Kanalens Længde 

 til dens Bund. Til to af disse Septulers frie Rand er ved 

 et tynclt Bindevæv fæstet de to dorsale Gastralfilamenter. 

 Kanalernes Vægge, der maa betragtes som de indre, frie 

 Flader af det hyaline Bindevæv og dets Forlængelser, ere 

 forsynede med Længde- og Tvermuskler, hvilke gaa over 

 paa Septula saaledes, at Tvermusklerne beklæde den ene 

 Flade og Længdemusklerne den anden af hvert Septulum. 

 Muskellaget har et Epithelovertræk (Entoderm), bestaaende 

 af runde Celler, 0.01 l mm , der ligge i flere Lag paa hver- 

 andre, ere temmelig fylclte med et fintkornet Protoplasma, 

 som stundom skjuler den runde, 0.004""" store Kjerne med 

 sit Kjernelegeme. Paa Længdekanalernes Vægge sees imel- 

 lem Septula større og mindre Aabninger, just paa de Steder, 

 hvor Grenene gaa over i Stammen. Længdekanalernes 

 Antal er kun ringe, — saaledes er der i elet her beskrevne 

 Exemplar, hvis Stamme er 200""" høi og omtrent 80'"™ i 

 Omkreds, høist 20 Kanaler, der alle tåge sin Begyndelse 

 paa Stammens øverste Del, hvor de udgaa fra enkelte Po- 

 lyper og maa betragtes som en Fortsættelse af sammes 

 Mavehulhed. 



Grenene have et lignende Epithelovertræk som Stam- 

 men; men det hyaline Bindevæv er forholdsvis noget bredere. 



tive-tissue cells are, by means of a few of their prolonga- 

 tions placed in direct communication with the minute nutri- 

 tory-ducts, (PL II, fig 1, d), so that, even, in the funda- 

 mental mass itself, which serves for the entire animal-colony, 

 there is a rich circulation of sap. 



On the exterior surface of the connective-tissue layer 

 inside of the ectoderm, there lies entrenched, a great mul- 

 titude of spicules placed closely together, and forming, 

 principally, aculeated double-spheres having a somewhat 

 constricted middle part, (PL I, figs. 8. 9). They measure, 

 0.160'"™ in length; the extremities, 0.100 in breadth; and 

 the mesial belt 0.032™'" in breadth. Only occasionally, are 

 manifold complex stellates met with, measuring 0.180™'" in 

 length, and 0.120™™ broad from the point of one ray to the 

 point of the opposite ray, (PL 1, fig. 10). Upon the mem- 

 branaceous dilation of the basal part, in which there is 

 found a multitude of longitudinal, as well as transversal, 

 ducts forming a continuous reticulation with large meshesj 

 the connective-tissue is quite filled with plain, minute, bistel- 

 lates measuring 0.048""" in length, and 0.040™'" in breadth 

 at the extremities, (PL I, figs. 11. 12). The spicules, in this 

 situation, lie crowded upon each other. 



From the inner surface of the broad hyaline connec- 

 tive-tissue layer of the stem, prolongations proceed; these are 

 rather narrow, and connect with each other, by which lon- 

 gitudinal ducts are produced and the Sarcosoma-proper is 

 formed. These longitudinal ducts are rather wide, and 

 this is specially the case with the exterior ones which 

 permeate through the whole length of the stem; upon the 

 walls of each duct there are 8 septula, which follow the 

 entire length of the duct to its bottom . To the free margin 

 of two of these septula, the two dorsal gastral filaments 

 are attached by a thin connective -tissue The walls of the 

 ducts, which must be considered as the inner free surfaces 

 of the hyaline connective-tissue and its prolongations, are 

 furnished with longitudinal and transversal muscles, which 

 are produced into the septula in such manner, that the 

 transversal muscles clothe the one surface and the longitud- 

 inal muscles the other surface of each septulum. The mus- 

 cular layer has an epithelial covering (Entoderm), consisting 

 of round cells measuring 0.011'"™ in diameter, placed in 

 several layers upon each other, and pretty well filled with 

 a minute granular protoplasm that occasionally conceals the 

 round nucleus, measuring 0.004'"™ in diameter, and its nucleus 

 body. On the walls of the longitudinal ducts, between the 

 septula, larger and smaller apertures are seen, exactly in the 

 situations where the branches are produced into the stem. 

 The number of the longitudinal ducts is only small; 

 there are for instance, in the specimen here described, 

 whose stem measures 200""" in height and about 80™'" in 

 circumference, 20 ducts, at most, which all have their 

 origin in the uppermost part of the stem, where they pro- 

 ceed from a few polyps, and must be considered as being 

 a continuation of the ventral-cavity of these. 



The branches have a similar epithelial covering as 

 the stem, but the hyaline connective-tissue is, relatively, 



