88 



Polyperne ere bægerformede, 8 lange. Bagkroppen 



er 2,5""" lang, cylindrisk, smal forneden, men udvider sig 

 noget op imoil Porkroppen og forsynet med 8 temmelig 

 fremspringende Ribber; baade disse og Furerne imellem 

 dem ere rige paa Spikler. Fig. 3. 4. Porkroppen er om- 

 trent lige lang som Bagkroppen og udvider sig trakttormigt 

 mod Skiven, hvor den bliver 3""" bred. Bagkroppens 

 Ribber fortsætte sig paa Porkroppen med samme Spikel- 

 rigdom. imedens Furerne blive mindre dybe op imod Ten- 

 takelranden og ganske spikelfri, hvorved der imellem Ten- 

 taklernes G-runddel dannes triangulære Felter, der ere 

 ganske nøgne og tæt besatte med Nematocyster, Fig. 4. a. 



Mundskiven er noget hvælvet, 3 ' bred, uden Kalk og 



har paa. Midten en aflang Mundaabning med tykke Læber, 

 Fig. 3. Tentaklerne ere temmelig tykke, omtrent 3 1 

 lange og paa hele deres aborale Side forsynede med Spikler. 

 Pinnulerne ere uden saadanne, Fig. 3. 4. 



Af de to indsamlede Exemplarer udgjorde det ene 

 en Koloni af Hunner, det andet af Hanne)-. Paa Hun- 

 exemplaret saaes en Mængde Polyper, hvis Forkrop var 

 stærkt opsvulmet og krummet med Tentaklerne indbøiede 

 mod Munden, saa hele Polypkroppen havde antaget næsten 

 Kugleformen, Fig. 2, a, hvilket havde sin Grund i. at en 

 stor Del af Svælget var opfyldt af Larver i forskjellige 

 Udviklingsstadier. 



Anatomisk-histologisk Undersøgelse. 



Stammen er som sædvanligt omgiven af et Ectoderm, 

 der dannes af flere Lag polyædriske Celler, indenfor hvilket 

 er et temmelig tykt. hyalint Bindevævslag med sine Binde- 

 vævslegemer og Xutritionskanaler, og fra hvis indre Flade 

 udgaa Forlængelser, der danne Kanalsystemet, som har en 

 Epithelbeklædning (Endothel). hestaaende ja f runde Celler 

 med Kjerne og Kjernelegeme. De fine Ernæringskanaler 

 ere ganske f vidte af lidt aflange Endothelceller, hvilket 

 oftere er omtalt. I Ectodermets dybere Cellelag, ligesom 

 i det til dette stodende Bindevæv, er en Mængde Spikler 

 leirede. 



Paa Basaldelen er bladede Klubber og mere eller 

 mindre sammensatte Stjerner almindeligst. Klubberne have 

 et kort Skaft, der er takket, undertiden kløvet i 

 Enden og kunne stundom have et nogent Midtparti: 



de ere fra 0.140—0.168 lange og fra 0.072—0.084""" 



brede foroven, Fig. 5 — 8. De sammensatte Stjerner variere 

 meget i Form og have tildels et nogent Midtparti; 

 de ere fra 0.120—0.164 lange og fra 0.064— 0.080""" 



The polyps are chalice-formed. and measure 8""" in 



length. The posterior body measures 2,5 ' in length; is 



cylindrical, narrow below, but ln-comes somewhat dilated 

 up towards the anterior body, and is furnished with 8 

 rather protuberant ribs. These, as well as the grooves 

 between them, are ricli in spicules (Pl. XII. figs. 3. 4). 

 The anterior body is about the same length as the post- 

 erior body. and. towards the disk, becomes dilated in in- 

 fundibuliform, and is. there, 3'"'" broad. The ribs of the 

 posterior body are continued into the anterior body, and 

 have the same spicular wealth, whilst the grooves become 

 less deep up towards the tentacular margin, and are quite 

 devoid of spicules. owing to which cause there is formed, 

 between the bases of the tentacles, triangular areas, which 

 are quite bare and closely occupied by nematocysts 

 (Pl. XII. fig. 4. a). The oral disk is somewhat arcuate; 

 is 3""" broad, and noncalcareous ; in the middle, it has 

 an oblong oral aperture with thick labiæ (Pl. XII. rig. 3). 

 The tentacles are pretty thick. and about 3""" in length; 

 thev are furnished, on the entire aboral side, with spicules. 

 The pinnules have no spicules (Pl. XII. figs. 3. 4). 



Of the two specimens obtained, the one was composed 

 of a colony of females, the other one of males. In the 

 female specimen, a multitude of polyps was observed, 

 «hose anterior body was strongly swollen out and curved, 

 the tentacles heing curved, inwards, towards the oral aper- 

 ture, so that the entire body had assumed an almost glob- 

 ular form (Pl. XII. fig. 2. a). This was caused by a 

 large part of the ventral cavity heing full of larva." in various 

 stages of development, a subject f shall, subsequently, 

 speak "f. 



Anatomo-histological Examination. 



The stem is. as usual, surrounded by an ectoderm formed 

 of several lavers of polyhedrical cells, inside of whicb there 

 is a pretty thick laver of hyaline connective-tissue with its 

 connective-tissuecorpusclesand nutritory ducts, and from whose 

 inner surface prolongations proceed. which form the ducti- 

 ferous system: this has an epithelial covering lEndothelium) 

 consisisting of globular cells with nucleus and nucleus- 

 body. The minute nutritory ducts are quite filled by 

 slightly oblong endothelial cells, which have, frequently, 

 been previously spoken of. In the deeper cellular lavers 

 of the ectoderm. and, also, in the connective-tissue which 

 abuts upon it. a multitude of spicules is entrenched. 



On the basal part, the most frequent spicules are 

 foliaceous clavates, and more or less complex stellates. 

 The clavates have a short shaft which is spicate, aud 

 occasionallv furcate in the extremity, and sometimes they 

 have a bare mesial part. Thev measure from 0.140 — 

 0.168""" in length. and from 0.072— 0-084'""' in breadth 

 above (Pl. XII. figs. 5—8). The complex stellates vårv- 

 innen in form. and have. partly, a bare mesial part. They 



