134 



Epizoanthus roseus. n. sp. 



Tal.. VI. Fig. 10; Tab. XXV. Fig. 4 — (i. 



Coenénchymet, der er temmelig tyndt. membranøst og 

 fast. er ikke meget udbredt over den lille Sten. som det 

 tildels omfatter. Tab. VI. Fig. 10; Tab. XXV. Fig. 4. 

 Fra det reiser sig 4 Polyper, der ere næsten pæreformige, 

 indtil 15""" lange og dobbelt saa brede i den øverste som 

 i den nederste Ende. Kolumnen er inkrustefet med fin 

 graalig-gul Sand. der dog ei er saa tæt sammenpakket, at 

 ikke den rosenrøde Hud skinner igjennem. naar Dyret er 

 fuldt udstrakt. Kolumnens øverste Band er forsynet med 

 12 inkrusterede. lancetformede Ribber, imellem hvilke sees 

 ligesaa mange nøgne, rosenrøde Felter, Tab. VI. Fig. 10; 

 Tal). XXV. Fig. 4 «; dens nederste Del. Basaldelen. er 

 rund. smal og temmelig fast paa Grund af det stærkt 

 inkrusterede Saml. 



Mundskiven er temmelig flad og i ilens Midte er en 

 aflang Mundaabning, hvorfra udgaa Folder henimod Skivens 

 Peripheri. Der er to Rækker Tentakler, som staa af- 

 vexlende, V2 i hverRække; de i den ydre Række ere tem- 

 melig tykke, afstumpede og omtrent halvt saa lange som 

 Skivens Bredde. Tal). XXV. Fig. 4 6, imedens de i den 

 indre ere længere, naa næsten Slavens hele Bredde og ere 

 slankere, Tab. XXV. Fig. 4 c. Naar Polypen er ganske 

 sammentrukken, har den en elliptisk Form. me'd sin smaleste 

 Del nedad. 



Farven. Coenénchymet er halvt gjennemsigtigt, graa- 

 ligt. Polypen er graagul af det inkrusterede Sand. men 

 den rosenrøde Hud skinner igjennem. Mundskiven rosen- 

 rød med blegere Radier. Tentaklerne er paa. den nederste, 

 bredere Del rosenrøde som Mundskiven. men paa den 

 øverste Halvdel ere de blegere og i Spidsen næsten hvide. 



A T ed den anatomisk-histologiske Undersøgelse viser det 

 sin. at hele Legemet som sædvanligt er beklædt med et 

 Ectoderm, Tab. XXV, Fig. 5 a, der bestaar af Cylinder- 

 celler, hvilke paa Mundskiven og Tentaklerne ere megel 

 hoie, ligesom der paa de sidste tindes en stor Mængde 

 Nematocyster imellem Cylindercellerne. Indenfor Ecto- 

 dermet er et bredt, hyalint Bindevæv, hvori er indsænket 

 større og mindre Sandkorn, som strække sig igjennem 

 Bindevævets hele Bredde, Tab. XXV. Fig. 5 b. 6 a. Disse 

 Sandkorn ligge dog tildels noget spredte, saa at Binde- 

 vevet kommer godt tilsyne, og da sees i dets Midte et 

 Belte af cirkulære Muskler, der ikke synes at være megel 

 udviklede, Tab. XXV, Fig. G b. Paa den indre Flade 

 af Bindevævet er fæstet et Muskellag, dannet af Længde- 

 og Tvermuskler, beklædt af Endothelet. Tab. XXV. Fig. 6 c. 



Epizoanthus roseus. n sp. 



Pl. VI. fig. 10; Pl. XXV. hus. 4— ii. 



The sarcosoma, which is rather thin, is membranous 

 and firni, and not widely distributed over the small stone 

 that it partially embraces (Pl. VI. fig. 10; Pl. XXV. fig. 4). 

 From the sarcosoma there arise 4 polyps; these are almost 

 piriform, measure up to lo""" in length, and are twice as 

 broad in the superior as in the inferior extremity. The 

 colunin is encrusted with tine greenish-yellow sand. which 

 is. however, not so closely crowded together but that it 

 permits the rosy-red integument to shine through when 

 the animal is fully extended. The uppermost margin 

 of the colunin is furnished with 1*2 encrusted lanceolate 

 ribs between which the same number of bare rosy-red 

 areas are observed (Pl. VI. fig. 10; Pl. XXV. fig. 4 a). 

 Its lowest part. the basal portion, is round, narrow, and 

 pretty finn owing to the strong encrustation of sand. 



The oral disc is rather Hat. and in its middle there 

 is an oblong oral aperture from which folds issne towards 

 the periphery of the disc. There are two series of ten- 

 tacles, placed alternatingly, 12 in each series: those of 

 the outer series are pretty thick and blunted, and ahout 

 half the length of the breadth of the disc (Pl. XXV. fig. 



4 &); while those ot the inner series are longer, attain 

 to nearly the entire breadth ot the disc. and are 

 slenderer > Pl- XXV. fig. 4 r). When the polyp is quite 

 contracted it has an elliptic form. with its narrowest por- 

 tion at the foot. 



TIw colour. The sarcosoma is semi-transparent, greyish. 

 The polyp is greyish-yellow owing to the encrusted sand, 

 but the rosy-red integument shines through. The oral disc 

 is rose-red, with lighter-coloured radii. The tentacles are, 

 upon their lowest broad part. rose-red like the oral disc. 

 but upon their superior half they are paler in colour. and 

 almost white at the point. 



Upon making the anatomo-histological investigation 

 it is seen, that the entire body is. as usual, clad with an 

 ectoderm (Pl. XXV. fig. 5 fl) that consists of cylinder-cells, 

 which. upon the oral disc and tentacles. are very high; 

 while, also. there are found on the last-named a great 

 multitude of nematocysts distributed between the cylinder- 

 cells. On the inside of the ectoderm there is a broad 

 hyaline connective-tissue in which are embedded larger 

 and smaller grains of sand that penetrate through the 

 complete thickness of the connective-tissue (Pl. XXV. figs. 



5 b. (i a). Those grains ot sand He. however, partly some- 

 wliat scatteredly, so that the connective-tissue is quite 

 freely visible, and there is. tlius, observed in its middle a 

 belt of circular muscles that do not appear to be very 

 much developed (Pl. XXV, fig. 6 b). Upon the inner 

 surface of the connective-tissue there is a muscular layer 

 attached, formed of longitudinal and transversal muscles 

 clad with the endothelium (Pl. XXV. fig. 6 c). 



