90 



parti; de ere fra 0.102—0.136"'™ lange og fra 0.060— 

 0.07 6" m brede i Enderne, paa Midten ere de fra 0.016— 

 0.020"»» brede, Fig. 36. 37. Enkeltvis sees mindre ud- 

 viklede Dobbeltstjerner, der ere 0.072""" lange, 0.032""" 

 brede i Enderne og 0.012""" brede paa Midten, Eig. 38. 

 De sammensatte Stjerner ere mere eller mindre udviklede; 

 de mest udviklede ere 0.124""» lange, 0.076""" brede, Eig. 

 39. 40; de mindre udviklede ere fra 0.096—0.104""» lange 

 og 0.044'»'» brede, Eig. 41.42. Klubberne ere fuldkommen 

 lig dem, der fmdes paa Stammen. 



Polyperne ere paa deres ydre Flade beklædte med 

 et meget bredt Ectoderm, dannet af flere Lag polyædriske 

 Celler, der have en næsten central, rund Kjerne med et 

 Kjernelegeme, Tab. XIII, Fig. 1, a; i de dybere Lag ere 

 Cellerne mere ovale, og iblandt dem sees lignende, encellede, 

 Slimkjertler, som de, der tidligere ere omtalte og afbildede ; 

 det er fornemmelig i det dybere Cellelag, at Spiklerne ere 

 leirede. Indenfor Ectodermet er et hyalint Bindevævslag, 

 som er smalt i Eorhold til Ectodermet, Tab. XIII, Eig. 1, 6, 

 og fra det udgaa som sædvanligt de 8 Septa, der fæste 

 sig paa Svælget, Tab. XIII, Fig. 1, c. Dette er uden 

 Kalk, og paa dets indre Flade sees langs Bugsiden en 

 halvrund Bende (Svælggruben), som begynder nogle Milli- 

 meter nedenfor Mundaabningen og ender lige ved Svælgets 

 nederste, fri Ende. Denne Svælggrube er beklædt med 

 lange, smale Celler, der paa deres fri Rand ere for- 

 synede med en lang, svingende Cilie (Greissel), Tab. XIII, 

 Fig. 1, d. Den øvrige Del ai Svælget er beklædt med et 

 almindeligt, cilierende Epithel, hvis Celler ere lidt afiange 

 i den øvre Ende, hvor de ere Fortsættelser af Ectodermet, 

 imedens de blive ganske runde i den nedre Del, hvor de 

 ligne Endothelcellerne, der tapetsere Kamrene. Eorøvrigt 

 frembød den histologiske Bygning af Svælget intet Sær- 

 egent, uden forsaavidt, at hos opsvulmede Hunpolyper var 

 det udvidet betydeligt og dannede en Hulhed, hvori 

 Ungerne udviklede sig ; netop det samme Forhold, som om- 

 taltes under Beskrivelsen af Xephthya flavescens. 



Paa Polypkroppen ligge Spiklerne tæt paa hverandre, 

 især gjælder dette Bygsiden og dennes Bibber, Tab. XII, 

 Fig 3. 4 ; paa Bugsiden ligge de mindre kompakte. Den 

 almindelige Form, hvorunder Spiklerne optræde, er Køllen; 

 meget sjeldnere er Spindelen og overordentlig sjeldent 

 Firlingen. Køllerne ere mere eller mindre rigt besatte 

 med Blade og stundom lidt krummede ; Skaftet er i 

 Begelen langt og takket, men paa enkelte er det kort og 

 mindre udviklet; de ere fra 0.108 -0.300""" lange og fra 

 0.040— 0.080""» brede i den øvre Ende, Eig. 43—47. 

 Spindlerne ere meget takkede og have enten afrundede 

 eller takkede Ender; de ere fra 0.224—0.228'»'" lange og 

 fra 0.044—0.052»"» brede, Fig. 48. 49. Imellem Køllerne 

 og Spindlerne sees hist og her mindre Spikier, der variere 



part. They measure from 0.102—0.136""" in length, and 

 from 0.060—0.076""» in breadth at the extremities, and at 

 the middle they measure from 0.016—0.020""" in breadth 

 (PL XII, figs. 36. 37). Occasionally, partially developed 

 bistellates are observed, and these measure 0.072""" in 

 length, 0.032'»'" in breadth at the extremities, and 0.012"™ 

 in breadth in the middle (PL XII, fig. 38). The complex 

 stellates are more or less developed; the best developed 

 measuring 0.124""" in length, and 0.076'"'" in breadth 

 (PL XII, figs, 39. 40); the less developed ones measure 

 from ( (.096— 0.104'"'» in length, and 0.044""» in breadth 

 (PL XII, figs. 41. 42). The clavates are exactly similar 

 to those found on the stem. 



The polyps are, on their exterior surface, covered 

 with a very broad ectoderm, formed of several layers of 

 polyhedrical cells which contain an almost central globular 

 nucleus with a nucleus body (PL XIII, fig. 1, a). In the 

 deeper layers the cells are more ovate and, amongst them, 

 there are seen unicellular mucous glands similar to those 

 that have been previously spoken of and illusti'ated. It 

 is principally in the deeper cellular layers that the spi- 

 cules are entrenched. Inside of the ectoderm, there is a 

 hyaline connective-tissue layer which is narrow in propor- 

 tion to the ectoderm (PL XIII, fig. 1, b), and from it 

 proceed, as usual, the 8 septa, which attach themselves to 

 the gullet (PL XIII, fig. 1, c). This is noncalcareous, and 

 on its inner surface, along the ventral side, a semi-circular 

 channel is seen (the gullet-groove) which commences a 

 few millimetres below the oral aperture and terminates 

 exactly at the gullet's lowest free extremity. This gullet- 

 groove is clothed with long narrow cells which, upon their 

 free margin, are furnished with a long waving cilium 

 (Greissel) (PL XIII, fig. 1 , d). The remaining part of the 

 gullet is clad with a common ciliate epithelium, whose 

 cells are slightly oblong in the superior extremity where 

 they are continuations of the ectoderm, whilst, in the 

 nferior part they are quite cylindrical and resemble the 

 endothelial cells that coat the chambers. The histological 

 structure of the gullet does not, otherwise, present any 

 peculiarity, except, in so far, that in swollen female polyps 

 it was dilated considerably, and formed a cavity in which the 

 young were developed ; exactly the same relation spoken 

 of in describing Nephthya flavescens. 



On the body of the polyp, the spicules are situated 

 close upon each other. This is specially the case on the 

 dorsal side and its ribs (PI. XII, figs. 3. 4). They are 

 situated less compactly on the ventral side. The most 

 frequent form, in which the spicules appear, is that of the 

 subclavates; they appear more rarely in the fusiform, and 

 as quadruplets, extremely rarely. The subclavates are more 

 or less richly beset with leaves, and are occasionally a little 

 curved; the shaft is, usually, long and spicate, but in a few 

 it is short and imperfectly developed; they measure from 

 0,108—0.300'»™ in length, and from 0.040—0.080""» in 

 breadth at the superior extremity (PL XII, figs. 43 — 47). 

 The fusees are very spicate, and have, either, rounded or 

 spicate extremities. They measure from 0.224 -0.228""» 



