30 



i Ectodermets indre Lag, dels i det indenfor Epithelial- 

 beklædningen værende, hyaline Bindevæv, hvor de ere nm- 

 givne af Ectodermcellér. Polypernes Ectoderm bestaar af 

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

 cylindrisk, forsynet med 4 enkle Rækker Spikler, 2 paa 

 hver Side. med et hredt Midtparti, hvori paa Rygsiden 

 sees enkelte Spikler, imedens Bugpartiet er spikelfrit, Fig. 

 47. Svadgrenden er oval og beklædt med lange Pidske- 

 celler. men den øvrige Del af Svælghulheden har et 

 Epithelialoyertræk, bestaaende af kortere, cilierende Celler. 

 hvorimellem sees pæreformede, encelledede Slimkjertler. 

 I den bagerste Del af Mavehulheden sees Æg i forskjellige 

 Udviklingsstadier. 



Paa Basaldelen ligge Spikleme tæl pakkede paa 

 hverandre og optræde her væsentligst under Form af 

 Dobbeltstjerner, sjeldnere ere sammensatte Stjerner og 

 Spindler, men sjeldnest Firlinger. Koller og Klubber. 

 Dobbeltstjernerne ere ganske særegne; de have meget 

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

 smaa Kugler, og et nogent 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 0.132""" lange og 0.050""" brede, 

 Fig. 52. Kollerne. 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 1 lange og 0.072 brede 



foroven. Fig 54. Firlingvrne 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 hivde. 



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 nogent og ofte saa kort. at det vanskeligt 

 iagttages. naar ikke Spikelen 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. partlv. in the inner 

 lavers of the ectoderm. and partlv. in the hyaline connec- 

 tive tissue lving inside of the epithelial covering. where they 

 are surrounded by ectodermie eells. The ectoderm of the 

 polvps consists of only two lavers of cells, like 'those of 

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

 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 elad with long flagelli-form eells. whilst the remain- 

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

 consisting of shortish, ciliated, cells. betweeii which, piriform, 

 unieellular 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, subclayates and clav- 

 ates. The bistellates are quite peculiar; they have very 

 broad ravs which terminate in a small star composed of 

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

 is verv 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 i tigs. 48. 49. 50). The complex stellates have 

 broad ravs similar to those of the bistellates, and which 

 likewise terminate in a small star; they measure (•.128'"'" 



in length. aud 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 verv rare, aud are furaished 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 

 • ».ii72""" in breadth above (fig. 54). The quadruplets have 

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

 partlv. with papillæ, partlv, 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 ravs which ter- 

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

 in length. and O.U72 in breadth (fig. 57). The bistel- 

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

 broad ravs. 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; ithey 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. Gli. The 



