89 



brede; hvor der er et nøgent Midtparti, er dette i Regelen 



fra 0.020—0.028 bredt, Fig. 9—15. Dobbeltstjernerne 



ere smaa og sjeldnere, have sum uttest et Døgent Midt- 

 parti, men paa enkelte sees Midtpartiet at være besal med 



smaa Tome; de ere fra 0.088—0.116 lange og omtrent 



0.080 brede i Enderne, medens Midtpartiet er 0.040""" 



bredt, Fig. Hi. 17. Noget hyppigere end Dobbeltstjerner 

 tindes Firlinger at' forskjellig Form; enkelte danne et Kurs. 



hvis Længdestok er 0.180 og Tverstok 0.100""°, og som 



er rigt besat med Blade, andre danne Rosetter, 0.148""" 

 lange, 0.140""" brede, og atter andre nærme sig Timeglas- 

 formen, ere 0.084""" lange. 0.080"™ brede i Enderne og 

 0.036 paa Midten, Fig. 18—20. Imellem disse forskjel- 

 lige Spikler sees hist og her enkelte, mindre udviklede. der 

 synes ikke at have antaget nogen bestemt Form ; de ere 



fra 0.072—0.092""" lange, fra 0.032—0.036 ' brede op 



imuil Enderne og paa Midten fra 0.(112—0.020""" brede. 

 Fig. 21. 22. 



Paa Stammen ere Dobbeltstjerner. sammensatte 

 Stjerner, samt Klubber almindeligst. Dobbeltstjernerne 

 have brede, næsten bladformige Straaler, hvis Ender dele 

 sig, og hvis nøgne Midtparti er meget langt; de ere fra 

 O.HI4— 0.12» i""" lange og fra 0.060—0 096""" brede i 

 Enderne med et Midtparti, der er fra 0.016—0.024""" 

 bredt. Fig. 23 — 25. De sammensatte Stjerner have saa 

 brede og takkede Straaler. at det har sine Vanskelig- 

 heder at gjenfinde Stjerneformen paa mange af dem; 

 de ere fra 0.121—0.160""" lange og fra 0.072— 0.128" 1 " 1 

 brede, enkelte ere lidt smalere paa Midten, og paa dem 

 viser der sig da et tyndt, nøgent Belte. Fig. 26 — 2'J. Klnb- 

 berne ere stærkt bladede, have et temmelig kort Skaft og 

 ere forskjellige fra dem paa Basaldelen, hvilket bedst sees 

 ved at sammenligne Figurerne; de ere fra 0.108—0.144""" 

 lange og fra 0.060—0.120"»» brede foroven, Fig. 30-33. 

 Imellem Klubberne sees enkelte, skaftede Stjerner, der 

 muligens ere ei fuldt udviklede Dobbeltstjerner, da der paa 

 Skaftets Ende er Takker, som kunne være endnu ikke ud- 

 voxede Straaler; de ere 0.180""" lange, 0.080""" hivde i 

 den egentlige Stjerne, medens Skaftet er kun 0.024""" bredt, 

 Fig. 34. Endelig tindes, men yderst sjeldent, en mindre 

 udviklet Dobbeltstjerne, der er 0.088""" lang. 0.044""" bred 

 i Enderne og 0.020""" bred paa det nogne Midtparti. Fig. 35. 



Paa Grenene optræder Dobbeltstjerner) sum den hyp- 

 pigste Repræsentant, sjeldnere er den sammensatte Stjerne, 

 iniedens Klubberne ere temmelig almindelige. Dobbelt- 

 stjernerne have brede, bladformige Straaler. som ere mere 

 eller mindre takkede i Enderne og have et nogent Midt- 



Den uorske Nordliavsexpedition. D. C. Danielssen: Alcyouida. 



1], 



the 



nieasure from 0.120—0.164""" in length, and from 0.064— 

 0.080""" in breadth. The mesial part. when bare. usually 



measures from 0.020 0.028 in breadth (Pl. XII. figs. 



9 — 15). The bistellate spicules are small and more 

 rare. and. most frequently, have a bare mesial part but, 

 in a few, the mesial pari is observed to be beset with 

 ininute aculeæ. They measure from O.oSS — 0.116""" in 

 length. and about 0.080""" in breadth at the extremities, 

 whilst the mesial part measures 0.040""" in breadth (Pl. XII. 

 figs. 16. 17). Somewhat mure frequently than the bistellates, 

 quadruplets of a variable form occur; a few form a 

 erueitix. wliose longitudinal arm measures 0.180""", and the 

 transversal arm 0.100""" in length, and these are richly 

 beset with leaves; others form rosettes measuring < ». 1 4s- 

 in length. and 0.140""" in breadth. and. again, others 

 approach in form to a sand-glass, and nieasure 0.084""" in 

 length. 0.080""" in breadth at the extremities. and 0.036 

 in the middle (Pl. XII, figs. 18—20). Between these 

 various spicules, a few imperfectly developed ones are. here 

 and there. observed, which do not appear to have acquired 



any definite form. They measure from 0.072 — 0.092 in 



length. from 0.032—0.036""" in breadth. up towards the 

 extremities. and from 0.012 — 0.020""" in breadth at 

 middle (Pl. XII, figs. 21. 22) 



Bistellates, complex stellates, and clavates are 

 most frequent spicular forms on the stem. The bistellates 

 have broad, almost foliate. ravs whose extremities divide, 

 and whose bare mesial part is verv long. They measure 

 from 0.104—0.120'""' in length. from 0.060—0.096""" in 

 breadth at the extremities, the mesial part measuring 

 from O.016— 0.024'""' in breadth (Pl. XII, figs. 23. 25). 

 The complex stellates have such broad and spicate ravs 

 that. it is with difficulty the stellate form can be recognised 

 in many of them. They measure from 0.121 — 0.160""" in 

 length. and from 0.072 — 0.128""" in breadth; a few are a 

 little narrower in the middle. and, in them. a thin. bare. 

 stripe shows itself (Pl. XII, figs. 26— 29). The clavates 

 are strongly foliated, have a rather short shaft, and they 

 differ from those of the basal part ; this is best observed 

 by comparing the illustrative figures. They measure from 



0.108—0.144 ' in length. and from 0.060—0.120""" in 



breadth above (Pl. XII, figs. 30—33). Between the clav- 

 ates, a few shafted stellates are observed. which are. possibly, 

 partially developed bistellates, because, on the extremityof 

 the shaft. spikes appear, which may probably be ravs not 

 vet developed. They measure 0.108""" in length, and 

 0.080""" in breadth through the star itself, whilst the shaft 



only measures 0.024 in breadth (Pl. XII, fig. 34). 



Finally, but extremely rarely, an imperfectly developed 

 bistellate is found, which measures 0.088""" in length. 



(>J)44 in breadth at the extremities. and 0.020""" in 



breadth at the bare mesial part (Pl. XII, fig. 35). 



On the branches, the bistellate form appears as the 

 most frequent spicular representative, more rarely do com- 

 plex stellates occur, whilst the clavates are rather frequent. 

 The bistellates have broad foliate ravs which are more or 

 less spicate at the extremities. and they have a bare mesial 



12 



