52 



Tentaklerne i den ydre Række ere bleg rosenrøde, de i den 

 indre ere brune og ved Grunden mørk kastaniebrune, 

 Tali. III, Fig. 5, 6. 



Ved Tversnit viser den inkrusterede Del af Kroppen 

 sig at beståa af 2 Lag; det ydre, der dannes af en tem- 

 melig tyk, seig Slimmembran, hvori er indleiret forskjellige 

 haarde, uorganiske Bestanddele, Tab. XII. Fig. 4 a, og en 

 temmelig skarpt afgrændset, tibros Cuticula, Tal). XII, Fig. 

 4 //. Denne Membran er fast adhæreret til den indenfor 

 liggende, egentlige Cutis, hvorfra den dog er skilt ved en 

 skarp Grændse, dannet af cylinderformede Epithelceller, 

 der udgjør det egentlige Ectoderm, Tab. XII, Fig. 4 c. 

 Slimmembranen er et Produkt af Ectodermet, iniellem hvis 

 Celler der findes en Mængde encellede Slimkjertler. Inden- 

 for Ectodermet er et bredt, fibrillært Bindevævslag, Tab. 

 XII, Fig. 4 d. i hvis Midte sees cirkulære Muskelfibriller, 

 som samle sig i tynde Bundter, Tal). XII. Fig. 4 e. 



Et Tversnit af Kroppens nogne Del viser et lidt for- 

 skjelligt Billede. Ectodermet bestaar lier af meget lange, 

 cilierende Cylin der celler, hvorimellem iagttages. foruden de 

 ovenfor omtalte Slimceller. en stor Mængde Nematocyster. 

 Disse fremtræde i 3 forskjellige Former, nemlig dels som 

 store, næsten cylinderformede Kapsler, hvori en tyk. spiral- 

 vunden Traad, dels som meget smaa, lancetformede Kapsler 

 enten uden noget traadformigt Indhold, eller med en lige, 

 spydformet Traad i Kapselen. Paa Tentaklerne, der og- 

 saa ere rige paa Nematocyster, tindes kun de to første 

 Former; indenfor Ectodermet ligger et Lag af stærke, 

 longitudinelle Muskler. 



Der er b' Par principale, fuldstændige Septa, som 

 staa temmelig langt fra hverandre, ligesom hvert Pars 

 Septa ere vel adskilte, saa at baade de intraseptale og de 

 interseptale Ru ni ere vide. Tab. XII. Fig. 5. Af disse 6 

 Par fuldstændige Septa ere de to Par Retningssepta, Tab. 

 XII, Fig. 5, l, og adskille sig fra de øvrige ved Muskel- 

 anordningen. De transverselle Muskler danne en foldet 

 Membran, hekkede den indre Flade af hvert Septum og 

 vende i det intraseptale Rum mod hverandre, Tab. XII, 

 Fig. 5 a, imedens de longitudinelle Muskler ere stærkt 

 udviklede og danne jo længere de komme henimod Svælg- 

 røret en tyk Busk, Tab. XII. Fig. 5 b, ere frestede til den 

 ydre Flade af hvert Septum og vende altsaa fra de trans- 

 verselle Muskler, ragende som en Fane ind i det intersep- 

 tale Rum. De longitudinelle Muskler danne meget smukke 

 Forgreninger, der bedst sees paa Tversnit, Tab. XII, Fig. 5. 



Richard Hertwig har beskrevet i sin ,.Report on the 

 Aetinaria dredged by „Challenger' J en ny Phellia under 



1. c. pag. 83 



tentacles which they enclose. The tentacles of the outer 

 serii's are pale rose-red. those of the inner series are 

 brown, and at tlieir bases dark chestnut-brown (Pl. III, 

 fig. 5, 6. 



In transversal sections the encrusted portion of the 

 body presents itself in two layers; the outer one, which 

 is formed ut' a rather thick, viscid, mucous membrane in 

 which various hard inorganic substances are embedded 

 (Pl. XII, fig. 4 «i, and a rather sharply defined, tibrous 

 cuticulum (Pl. XII, fig. 4 b). This membrane is firmly 

 adherent to the true cutis which lies inside, trom which 

 it is, however. divided by a clearly defined margin formed 

 of cylindric epithelial cells which compose the real ecto- 

 derm (Pl. XII. fig. 4 <■). The mucous membrane is a 

 prpduct of the ectoderm. between whose cells a multitude 

 of unicellular mucous glands are found. Inside of the 

 ectoderm there is a broad, fibrillar laver of connective- 

 tissue (Pl. XII. Hg. 4 d). in whose middle circular nuiscle- 

 fibrils which collect themselves into tliin fasciculi (Pl. 

 XII. tig. 4 e) are observed. 



A transversal section of the exposed part of the 

 body presents a slightly different pictnre. Here the ecto- 

 derm consists of very long, ciliating cylinder-cells, between 

 which there are observed a multitude of nematocysts, besides 

 the mucous glands mentioned above. These present them- 

 selves in :i different forms viz. partlv as large, almost 

 "cylindrically formed capsules, in which there is a thick 

 spirally coiled filament; partlv as very small lanceolate 

 capsules either withont any tilamentous contents. or 

 with a straight, hastiform filament in the capsule. 

 lpon the tentacles. which are also rich in nematocysts, 

 only the two first-named forms are found. Inside of 

 the ectoderm there lies a layer of powerful longitudinal 



llHlscles. 



There are li pairs of principal. perfect septa, which 

 .u-e placed pretty far apart from each other, while at 

 same time each pair of septa are well separated, so that 

 both the intraseptal and the interseptal spaces are wide 

 (Pl. XII. tig. 5). Of these 6 pairs of perfect septa, 2 

 pairs are directive septa (Pl. XII, fig. 5, l), and distinguish 

 themselves from the others by their muscular arrangement. 

 The transversal muscles form a folded membrane and 

 clothe the inner surface of each septum. and tace towards 

 each other in the intraseptal space (Pl. XII, fig. 5 a), 

 while the longitudinal muscles, which are powerfully devel- 

 oped and which, the closer they approach to the oesophagus, 

 form a thick frutex (Pl. XII, fig. 5 b), are adherent to the 

 outer surface of each septum and, consequently, face from 

 the transversal muscles and reach like a flag into the inter- 

 septal space. The longitudinal muscles form very beautiful 

 ramifications, which are best seen in transversal sections 

 (Pl. XII, fig. 5). 



Richard Hertwig has described, in his Report on the 

 Aetinaria dredged by „Challenger" \ a new Phellia under 



1 1. c. pag. 83. 



