135 



Fra den indre Kropsvæg udgaa 24 Septa, hvoraf 12 

 ere fuldstændige, Tab. XXV, Fig. 5. Af disse Macrosepta, 

 Tal). XXV, Fig. 5 c, er der 2, som ved sin stærke Byg- 

 ning udmærke sig fremfor de øvrige. Disse, der ere Ret- 

 aingssepta, fæste sig paa den ydre Side af Svælgrøret paa 

 dit Sted. som svarer til Svælggruben paa den indre Side 

 (Bagsiden), Tab. XXV, Fig. 5 d. Samtlige Macrosepta 

 ere beklædte med Længde- og Tverrauskler, hvoraf de første 

 ere stærkt udviklede, især veil deres Udspring fra Krops- 

 væggen, hvor de tildels danne en større eller mindre Busk; 

 men foruden den stærke Muskulatur bære alle Macrosepta 

 Mesenterialfilamenter og Generationsorganer. Disse sidste 

 vare kun lidet udviklede; de indeholdt Æg i det begyndende 

 Stadium. 



De 12 ufuldstændige Septa (Mierosepta) danne liste- 

 formige Fremspring fra den indre Kropsvæg; de ere stil- 

 lede imellem Macrosepta enkeltvis, naar undtages 2, der 

 staa sammen imellem 2 Macrosepta og maa betragtes som 

 Retningssepta, der tilhører Rygsiden, Tab. XXV, Fig. 5 e, 

 idet de ere stillede ligeoverfor de 2 fuldstændige Retnings- 

 septa paa Bugsiden. Ogsaa Mierosepta ere forsynede med 

 Muskulatur, som bestaar af Længde- og Tvermuskler; men 

 den egentlige Anordning var forrykket paa Tversnittene — 

 det har nemlig sine store Vanskeligheder at faa rene Tversnit 

 paa Grand af Inkrustationen. Mierosepta ere golde. Svælg- 

 røret er lidt fladtrykt og paa dets indre Flade. der er 

 foldet, er en tydelig udpræget Svælggrnbe, Tab. XXV, 

 Fig. 5 /. 



Findested. 



Station 200. En Gruppe, bestaaende af 4 Polyper, 



netop den. som er tegnet. 



Artskarakter. 



Coenenchymet tyndt, ikke meget udbredt over Stenen. 

 Polyperne, der staa i en liden Gruppe, ere pæreformede, 

 indtil 15""" lange. Den øverste Ende dobbelt saa bred 

 som Basaldelen. Kolumnen inkrusteret med tin, graagul 

 Sand, der dog lader den rode Hud gjeiinemskinne, og paa 

 dens øverste Rand 12 inkrusterede Ribber, hvorimellem 

 ligesaamange nogne Felter. Mundskiven Had. tint foldet; 

 Munden aflang. 2 Rækker Tentakler, 12 i hver; de i ilen 

 inderste Række længst. Farven: Coenenchymet graaligt; 

 Polyperne graagule af det inkrusterede Sand. men selve 

 Huden laxerød. Mundskiven som Huden med blegere 

 Radier. Tentaklerne ved Granden laxerøde, paa Midten 

 blegere, næsten hvide i Spidsen. 



From tlie inner wall of the body 24 septa issne, ot 

 whieh 12 are perfect septa (Pl. XXV, 5). Of those macro- 

 septa (Pl. XXV. hg. 5 e), there are 2, which by their 

 strong structure distinguish themselves from the others. 

 These. whieh are direetive septa, attach themselves to the 

 external side of the cesophagus, in the situation that cor- 



res] ds to the gullet-groove on the internal side (the 



ventral side) Pl. XXV. fig. 5 d). All the macrosepta 

 are clad with longitudinal and transversal museles. of whieh 

 the first-named are strongly developed, especially at their 

 origin in the wall ot the body. where they partly form a 

 greater or lesser tuft. hut besides their great musculosity 

 all the macrosepta carry mesenterial rilaments and repro- 

 ductive organs. These last were only little developed; they 

 contained ova in the rudimentary stage. 



The 12 imperfect septa (mierosepta) fonn fillot-formed 

 projections from the inner wall of the body. They are 

 placed siiigly, between the macrosepta, except 2 that are 

 placed together, between 2 macrosepta, and must be 

 regarded as direetive septa that pertain to the dorsal side 

 (Pl. XXV, fig. 5 ei, as they are placed exactly opposite 

 the 2 perfect direetive septa of the ventral side. The 

 mierosepta are also furnished with a musculosity consisting 

 of longitudinal and transversal museles, but the proper 

 arrangement was disturbed in the transversal sections. It 

 is a matter of the greatest difficulty to obtain cleah-cut 

 sections owing to the encrustation. The mierosepta are 

 sterile. The cssophagus is a little Hattened. and on its 

 inner surfare, which is folded, there is a. distinctly pro- 

 minent gullet-groove (Pl. XXV. fig. 5/). 



Habitat. 



Station No. 200. A group, consisting of 4 polyps, 

 precisely the one that is illustrated. 



Specific characteristics. 



The sarcosoma thin, not widely distributed over the 

 stone. The polyps, which stand in a small group, are 

 piriform, measure up to 15"™ in length. The superior part 

 is twice the breadth of the basal part. The column is 

 encrusted with fine sand of a greyish-yellow eolour, which 

 permits, however, the red integument to become visible 

 through the encrustation ; on its uppermost margin there 

 are 12 encrusted ribs, between which there are the same 

 number of bare areas. The oral disc is flat, finely folded. 

 The oral aperture oblong. Two series of tentacles, 12 in 

 each. those of the innermost series being the longest. 

 The eolour. The sarcosoma greyish. The polyps greyish- 

 yellow owing to the encrusted sand, hut the integument 

 itself is salmon-red eolour. The oral disc same eolour as 

 the integument. with paler-coloured radii. The tentacles 

 salmon-red eolour at their base, paler in eolour in the 

 middle and alm ost white at the point. 



