30 



i Ectodermets indre Lag, dels i det indenfor Epithelial- 

 beklædningen værende, hyaline Bindevæv, hvor de ere om- 

 givrie af Eetodermceller. Polypernes Ectoderm bestaar af 

 kun to Lag Celler, lig dem paa Stammen. Svælgrøret er 

 cylindrisk, forsynet med 4 enkle Rækker Spikier, 2 paa 

 hver Side, med et bredt Midtparti, hvori paa Rygsiden 

 sees enkelte Spikier, imedens Bugpartiet er spikelfrit, Fig. 

 47. Svælgrenden er oval og beklædt med lange Pidske- 

 eeller, men den øvrige Del af Svælghulheden har et 

 Epithelialovertræk, bestaaende . af kortere, cilierende Celler, 

 hvorimellem sees pæref ormede, encelledede Slimkjertler. 

 I den bagerste Del af Mavehulheden sees Æg i forskjellige 

 LTdviklingsstadier. 



Paa Basaldelen ligge Spiklerne tæt pakkede paa 

 hverandre og optræde her væsentligst under Eorm af 

 Dobbeltstjerner, sjeldnere ere sammensatte Stjerner og 

 Spindler, men sjeldnest Firlinger, Køller og Klubber. 

 Dobbelt stjerner ne ere ganske særegne; de have meget 

 brede Straaler., der ende i en liden Stjerne, sammensat af 

 smaa Kugler, og et nøgent Midtparti, som paa enkelte er 

 meget kort; de ere fra 0.076—0.140""" lange og fra 0.052 

 —0.068""" brede i Enderne, og Midtbeltet er fra 0.016— 

 0.028""" bredt, Fig. 48. 49. 50. De sammensatte Stjerner 

 have lignende brede Straaler som Dobbeltstjernerne, der 

 ligeledes ende i en liden Stjerne; de ere 0.128""" lange og 

 0.076""" brede. Fig. 51. Spindlerne have Bladbesætning 

 med tandede Blade, ere 0J32""" lange og 0.050'""' brede, 

 Fig. 52. Køllerne, der ere meget sjeldne, ere udstyrede 

 med stjerneformede Papiller og ere 0.252""" lange og 

 0.068""" foroven, Fig. 53. Klubberne. der ogsaa ere meget 

 sjeldne, have en rig Bladforsiring ; Bladene have ind- 

 skaarne Rande; de ere 0.132""" lange og 0.072""" brede 

 foroven, Fig 54. Firlingerne have en mere eller mindre 

 udpræget Korsform, ere tæt besatte dels med Papiller, 

 dels med Blade' og fra 0.080-0.088""" lange, 0.076'"'" brede, 

 Fig. 55. 56. 



Paa Stammen ere sammensatte Stjerner hyppigst, 

 men næsten ligesaa almindeligt tindes ganske særegne 

 Dobbeltstjerner; sjeldnere ere Spindler, hvilke nærme sig 

 temmelig meget dem paa Basalen. De sammensatte 

 Stjerner have brede Straaler, der ende i en liden, fire- 

 armet Stjerne; de ere 0.116""" lange, 0.072""" brede, Fig. 57. 

 Dobbeltstjernerne ere mærkelige; hver Ende har i Regelen 

 4 brede Straaler, der hver ende i en liden firearmet Straale ; 

 Midtpartiet er nøgent og ofte saa kort, at det vanskeligt 

 iagttages, naar ikke Spikeren ligger lige paa Siden; de 

 ere fra 0.092— 0.128'""' lange og fra 0.068—0.100""" brede 

 i Enderne. Midtpartiet er fra 0.016—0.028""" bredt, Fig. 

 58. 59. 60. 61. Spindlerne have brede Takker, der ende 

 i en firestraalet Stjerne; de ere 0.148""" lange, 0.064""" 

 brede, Fig. 62. 



whilst, also, the spicules are entrenched, partly, in the inner 

 layers of the ectoderm, and partly, in the hyaline connec- 

 tive tissue lying inside of the epithelial covering, where they 

 are surrounded by ectodermic cells. The ectoderm of the 

 polyps consists of only two layers of cells, like those of 

 the stem. The gullet-tube is cylindrical, and is furnished 

 with 4 single series of spicules, 2 upon each side, leaving 

 a broad intermediate area, in which, upon the dorsal side, 

 a few spicules are observed, whilst the ventral portion is 

 devoid of spicules (fig. 47). The gullet-passage is oval, 

 and is clad with long flagelli-form cells, whilst the remain- 

 ing portion of the gullet-cavity has an epithelial coating, 

 consisting of shortish, ciliated, cells, between which, piriform, 

 unicellular mucous glands are seen. In the extreme pos- 

 terior part of the gastral cavity, ova in various stages of 

 development are visible. 



On the basal part, the spicules lie closely packed 

 upon each other, and occur, here, principally, in the form 

 of bistellates, more rarely as complex stellates and fusees, 

 and, still more rarely, as quadruplets, subclavates and clav- 

 ates. The bistellates are quite peculiar; they have very 

 broad rays which terminate in a small star composed of 

 small spheres, and a bare mesial portion, which in some, 

 is very short; they measure from 0.076 — 0.140""" in length, 

 and from 0.052 — 0.068""" in breadth at the extremities, 

 and the mesial stripe measures from 0.016 — 0.028'"'" in 

 breadth (figs. 48. 49. 50). The complex stellates have 

 broad rays similar to those of the bistellates, and which 

 likewise terminate in a small star; they measure 0.128'"'" 

 in length, and 0.076""" in breadth (fig. 51). The fusees 

 have leafy ornations with dentated margins; they measure 

 0.132""" in length, and 0.050""" in breadth (fig. 52). The 

 • subclavates are very rare, and are furnished with stelliform 

 papillæ ; they measure 0.252""" in length, and 0.068'"'" in 

 breadth above (fig. 53). The clavates, which also are very 

 rare, have a rich leafy decoration, the leaves being indented 

 in the margins; they measure 0.132""" in length, and 

 0.072""" in breadth above (fig. 54). The quadruplets have 

 a, more or less, prominent cruciform, and are closely beset, 

 partly, with papillæ, partly, with leaves; they measure 

 from 0.080—0.088""" in length, and 0.076""" in breadth 

 (figs. 55. 56). 



In the stem, complex stellates are the most frequent, 

 spicular forms, but, nearly as frequently, quite peculiar 

 bistellates are, also, observed. Fusees, which approach 

 pretty much in form to those of the basal part, are more 

 rare. The complex stellates have broad rays which ter- 

 minate in a small four-rayed star; they measure 0.116""" 

 in length, and 0.072""" in breadth (fig. 57). The bistel- 

 lates are remarkable ; each extremity has, as a rule, four 

 broad rays, each of which terminates in a small four-rayed 

 star; the intermediate portion is bare and, often, so short, 

 that it can with difficulty be detected unless the spicule 

 lies quite on its side; (they measure from 0.092 — 0.128""" 

 in length, and from 0.068—0.100""" in breadth at the 

 extremities. The intermediate portion measures from 

 0.016—0.028""" in breadth (figs. 58. 59. 60. 61). The 



