114 



Udsprmg nærmere Stammens Sideparti, saa at en Del af 

 denne synes at være nøgen i en lang Strækninsr, Fig, 2. 



Polyperne ere langstrakt-cylindriske, retraktile, 8— 10 mm 

 lange. Forkroppen omtrent 3 mm lang, har 8 stærke Længde- 

 ribber, dannede af Kafkspikler og imellem disse Ribber sees 

 ligesaa mange, noget nedsænkede Felter, i hvis nedre Del 

 Spiklerne ligge temmelig tætte, imedens de ere noget mere 

 spredte i den øvre, lidt bredere Del; men Spiklerne i 

 disse Felter ligge ikke tættere, end at Mavehulheden meget 

 godt kan sees, hvilket ikke er Tilfældet med Ribberne. 

 Fig. 4. Bagkroppen er noget hengere end Fortroppen, 

 og her ligge Spiklerne paatvers og danne ligesom Guir- 

 lander omkring den, Fig. 4." Tentaklerne ere 3- -4"™ lange; 

 hele deres aborale Side er bepantsret med Kalkspikler, 

 Fortsættelse fra Kroppens Ribber, Fig. 4. Pinnulerne ere 

 korte, tykke og ligeledes forsynede med Spilder, Fig. 4. 



Polypcellen er oval; naar Polypen er stærkt indtruk- 

 ken, næsten rund; den bar 8 Ribber, der giver den et i 

 Randen tandet Udseende, naar Polypen er halvt indtrukken, 

 Fig. 4, a, men danner en ottestraalet Stjerne, naar den er 

 fuldt indesluttet i Cellen, Fig. 3. Hvor den ene Polyp- 

 celle støder til den anden, er der en saa intim Sammen- 

 voxning af Cellernes Vægge, at der imellem dem er spar- 

 somt Coenenchym, og da Polyperne staa i Regelen i Grup- 

 per, er der i det Hele tåget paa de Steder, de indtage, 

 yderst lidet Coenenchym, der dog. hvor det lindes, er for- 

 synet med Spikier, Fig. 5. 



Anatomisk-histologiske Undersøgelser. 



Stammen og Grenene ere udvendigt beklædte med et 

 Epitbel, der dannes af flere Lag polyædriske Celler, som 

 have en næsten central Kjerne, et rundt Kjernelegeme og 

 et fintkomet, temmelig tyndt Protoplasmaindhold. I det 

 yderste Lag ere Cellerne næsten klare, meget fattige paa 

 Protoplasma, men ere dunklere og rigere paa dette i det 

 indre Lag, hvor der iagttages hist og her imellem Epithel- 

 cellerne aflange, kolbeformige, encellede Slimkjertler med en 

 temmelig lang Udløber, lig dem, som oftere have været 

 omtalte. Indenfor dette Ectoderm er et Lag af hyalint 

 Bindevæv, hvori findes Ernæringska naler samt Bindevævs- 

 legemer med en eller flere Udløbere, — og fra hvis indre 

 Væg udgaa de sædvanlige Forlængelser, der danne Skille- 

 væggene for de store Kanaler. I Ectodermet ligesom i 

 det ydre Bindevævslag ere Spiklerne leirede saaledes, at 

 den største Mængde findes i cle indre Cellelag af Epithelet, 

 — hvor de ere tilstede i Eindevævet, er der altid en 

 Sænkning af Ectodermets Celler, saa at disse omgive dem. 



much thicker than the root, and are pretty closely beset with 

 polyps (figs. 2. 3). There are only a few branches — 

 3—4 in all — and these have their root nearer to the 

 lateral part of the stem, so that a part of the stem appears 

 as if bare for a considerable extent (fig. 2). 



The polyps are elongato-cylindrical, retractile, and 

 measure 8— 10 mm in length The anterior body measures 

 about 3""" in length, and has 8 strong longitudinal ribs 

 formed of calcareous spicules, and between these ribs a 

 similar number of somewhat depressed areas are seen, in 

 whose lower part spicules lie pretty compactly, whilst they 

 are somewhat more scattered in the upper, somewhat 

 broader, part; but the spicules in these areas do not lie 

 closer, than that the gastral cavity can very well be ob- 

 served, which is not the case with the ribs (fig. 4). The 

 posterior body is somewhat longer than the anterior body, 

 and the spicules, here, lie transversally and, as it were, 

 form garlands about it (fig. 4). The tentacles measure 

 3 — 4«™ j n lengtla. and their entire aboral side is ensheathed 

 with calcareous spicules, which are a continuation of the 

 ribs of the body (fig. 4). The pinnules are short, thick, 

 and likewise furnished with spicules (fig. 4). 



The polyp-cell is oval, but when the polyp is strongly 

 retracted it is almost round ; it has 8 ribs, which impart to 

 it a dentated appearance in the margin when the polyp 

 is semi-retracted (fig. 4, a), but when the latter is quite 

 enclosed in the cell (fig. 3) it forms an eight-rayed star. 

 Where the one polyp-cell joins to the other, there is such 

 an intimate concreting of the walls of the cells that, there 

 is only a thin sarcosoma- visible between them, and as the 

 polyps are placed in groups, as a rule, there is, upon the 

 whole, at the places where they occur, extremely little sarco- 

 soma, which however is furnished with spicules at the 

 places where it is found (fig. 5). 



Anatomo-histological Examination. 



The stem and the branches are exteriorly clad with 

 an epithelium, formed of several layers of polyhedrical 

 cells, which contain an almost central nucleus, a round 

 nucleolus, and a minutely granular, pretty thin, protoplas- 

 mic substance. In the outermost layer, the cells are almost 

 pellucid, and very poor in protoplasm,» but they are less 

 pellucid and richer in protoplasm in the inner layer, where, 

 also, there are, here and there, observed between the 

 epithelial cells, oblong, claviform, unicellular mucous glands 

 with a pretty long prolongation, resembling those that have, • 

 already, frequently been referred to. Inside of this ecto- 

 derm, there is a layer of hyaline connective-tissue in which 

 nutritory ducts are found, also connective-tissue corpuscles 

 having one or more prolongations, and from whose inner 

 Avail issue, the usual prolongations which form the divi- 

 sional walls of the large ducts. In .the ectoderm, as well 

 as in the outer connective-tissue layer, the spicules are 

 embedded in such manner, that the greatest number are 



