Forbindelse med de fine Saftkanalér, Tab. II, Fig. 1. d, 

 saa at der i selve Grundmassen for den hele Dyrekoloni 

 er et rigt Saftoinløb. 



Paa den ydre Flade at' Bindevævslaget, indenfor 

 Ectodermet, er leiret en stur Mængde Spikler, der ligge 

 tast til hverandre og danne væsentligt tornede Dobbelt- 

 kugler merl 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 rindes en stor 

 Mængde saavel Længde- som Tverkanaler, dannende et 

 sammenhængende Net med store Masker, er Bindevævet ud- 

 lyldt ai' simple, smaa Dobbeltstjerner, 0.048""" lange, I .040""" 

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

 paa hverandre. 



Fra den indre Flade ai Stammens brede, hyaline 

 Bindevævslag udløbe Furlængelser, sum ere temmelig smale 

 og forbinde sig med hverandre, hvorved Længdekanalerne op- 

 staa og det egentlige Coenencbym 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 tyndt 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 

 ai runde Celler. 0.011""*, der .ligge i flere Lag paa hver- 

 andre, ere temmelig fyldte med et fintkornet Protoplasma, 

 sum 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 det her beskrevne 

 Exemplar, hvis Stamme er 200""" hoi og omtrent 80""" i 

 < Imkreds, 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 

 Mavelmlhed. 



Grenene have et lignende Epithelovertræk som Stam- 

 men; men det hyaline Bindevæv er forholdsvis noget bredere. 



tive-tissue cells are, by means cf a lew of tbeir prolonga- 

 tions placed in direct communieation vyith the minute nutri- 

 tory-ducts, (Pl. 11, fig 1, </|. so that, even, in the funda- 

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

 there is a rieh circulation ot sap. 



On the exterior surface of the connective-tissue layer 

 inside of tin.' ectoderm, there lies entrenched, a great mul- 

 titude of spicules placed closely together, and forming, 

 principally, aculeated double-spheres having a somewbat 

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

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

 the mesial helt 0.032""" in breadth. Only occasionally, are 

 manifold eomplex stellatcs met with, measuring 0.1 St)""» in 

 length, and 0.120""" broad from the point of one rav to the 

 p.iint of the opposite ray, (Pl. 1. fig. 10). Upon the mem- 

 branaeeous dilation of the basal part, in which there is 

 found a multitude of longitudinal, as well as transversal, 

 duets forming a continuous retieulation with large meshesi 

 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, fiss. 11. 12). The spicules. in this 

 situatiiiii. lie erowded upon each other. 



From the inner surface of the broad hyaline connec- 

 tive-tissue laver of the stem, prolongations proceed ; tbeseare 



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

 gitudinal duets are produced and the Sarcosoma-proper is 

 formed. These longitudinal duets 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 

 rn' two of these septula, the two dorsal gastral filaments 

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

 duets. which must be considered as the inner free surfaces 

 of the hvaline 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 lavers 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. Un the walls of the longitudinal duets, 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 duets is only small; 

 there are for instance, in the specimen here described, 

 whese stem measures 2<>0" im in height and about 80»"" in 

 circumference, 20 duets. 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 ot these. 



The branches have a similar epithelial covering as 

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



