116 



aabner sig for at udføre Excrementerne. I Svælg- 



epithelet, nærmest Bindevævslaget. er der 4 Dobbeltrækker 

 Spikler, Fig. 8. 



Kjønsprodukterne udvikle sig i Mavehulheden ; de 

 fleste Polyper havde mere eller mindre udviklede Æg, og 

 hos en Polyp var Fosterdannelsen begyndt. Embryonerne 

 havde en langagtig Form. i hvis ene. brede Ende saaes 

 en temmelig dyb Indsænkning, Gastralinunden. der forte 

 ned til en Hulhed. Ingen Spikeldannelse var endnu at 

 opdage, saa Spilder dannes, ifølge dette, senere end hos 

 Nephthya-Stægten. 



Paa Basaldelen. der er temmelig haard af den sammen- 

 pakkede Kalk. fremtræde Spiklerne almindeligst under 

 Form af elliptiske Spindler, Dobbeltstjerner og Drueklaser? 

 sjeldnere sum Klubber og sammensatte Stjerner, men yderst 

 sjeldent som en Firling. Spindlerne ere stærkt takkede, og 

 hver Tak har en temmelig bred Ende, der enten er tandet 

 eller straalet : de ere som oftest tilspidsede i Enderne, men 

 disse kunne ogsaa være lidt afstumpede; de ere fra 0.140 



—0.184""" lange og fra 0.060—0.084 brede paa Midten. 



Fig. 9. 10. Dobbeltstjernerne have et nøgent Midtparti; 

 Straalerne ere brede, ende som oftest i en liden, 4 — 5 

 straalet Stjerne; de ere fra 0.084 — 0.116""" lange og fra 

 0.044—0.060"™ brede; det nøgne Parti er fra 0.016— 

 0.028""" bredt, Fig. 11. 12. lo. 14. Druespiklerne dannes 

 af et Konglomerat af Kalkkugler, der stundom hviler paa 

 en bred Basis, stundom synes at være uden nogen saadan; 

 enkelte ere næsten runde, andre aflange; de første ere 

 0.052""" i Bredde og Længde, Fig. 15; de sidste ere fra 



0.080—0.096""" lange og fra 0.048—0.056' brede paa 



Midten. Enderne ere noget smalere, Fig. 16. 17. Klub- 

 berne ere besatte • snart med runde, fremragende Papiller 

 med et næsten nøgent, kort Skaft, snart med bredbladede 

 Papiller; de ere fra 0.124—0.144""" lange og fra 0.056— 



0.072 ' brede i den øverste Ende. Fig. 18. 19. 20. De 



sammensatte Stjerner ere temmelig uregelmæssige og nærme 

 sig tildels Spindelformen ; de ere 0.152""" lange og 0.068 

 brede. Fig. 21. Firlingerne nærme sig Korsformen, ere 

 besatte med Papiller. 0.080""" lange, 0.060""" brede, Fig. 22. 



Nederst paa Stammen ere lignende Druespikler og 

 elliptiske Spindler, som ovenfor omtalt, de almindeligste. 

 Ogsaa her ere de sammensatte Stjerner sjeldnere, imedens 

 Klubber og Dobbeltstjerner ere hyppigere, men dog ikke 

 saa hyppige som paa Basaldelen. Desforuden tindes enkelte 

 Firlinger og ikke saa ganske sjeldent runde Konglomerater 

 af Kalkkugler samt lige Spindler besatte med Papiller. Af 

 de faa Firlinger, som tindes, ere enkelte korsformede og 

 besatte med runde Papiller, 0.096""" lange med en Tverstok. 

 der er 0.088'"'". Fig. 23; andre have en meget uregelmæssig 

 Form. ere besatte med store Takker og Knuder os 0.096 



the dorsal portion — opens itself to expel the excrementa. 

 In the epitbelium of the gullet, next to the laver of con- 

 nective-tissue. there are 4 double series of spiddes (fig. 8). 



The sexual products develope themselves in the 

 gastral-cavity ; most of the polyps bad more or less devel- 

 oped ova. and in one polyp the fætal formation bad com- 

 menced. The embryons have an elongated form ; and a 

 pretty deep depression — the gastrula mouth — was visible 

 in the one. broad extremity. leading down to a cavity. No 

 spicular formation was as vet to be observed, so that 

 it would appear, as if the spicules are formed at a later 

 stage than in the Nephthya genus. 



In the basal part. which is pretty hard owing 

 to the packing together of the calcium. the spicules 

 most frequently appear in the form of elliptie fusees, 

 bistellates and racemates grape-like dusters) more rarely, 

 as clavates and cpmplex stellates, and as a quadruplet 

 extremely rarely. The fusees are strongly spicate, and each 

 spike lias a pretty broad extremity which is. either. dentated 

 or rayed. Most frequently, they are acuminated at the 

 extremities, but these may also be a Little obtuse; they 

 measure from 0.140—0.184""" in length, and from 0.060 — 

 0.084 in breadth at the middle (figs. 9— 1 0). The bistel- 

 lates have a bare mesial part; their ravs are broad and, 

 most frequently, terminate in a small 4 — b rayed star; 

 they measure from 0.084 — 0.116™" in length. and from 

 0.044—0.060"™ in breadth; the bare portion measures from 

 0.016—0.028""" in breadth (figs. 11. 12. 13. 14). The 

 spicules of the racemates are formed of a conglomeration 

 ofcalcareous globules which, occasionally, rests upon a broad 

 liaMs, and sometimes appears i" be without anj basis; a 

 few arr almosl round. others are oblong; the first-named 



measure 0.052 in breadth and length (fig. 15), and the 



lastnamed measure from 0.080 0.096""" in length, and from 

 0.048—0.056""" in breadth at the middle. The extremities 

 are somewhat narrower (figs. L6t— 17). The clavates are 

 beset. sometimes. with round. projecting. papillæ which have 

 an almost bare. short. shaft, and sometimes with broad 

 foliaceous papillæ: they measure from 0.124 — u. 1 44""" in 

 length, and from 0.056 — 0.072""" in breadth at the upper- 

 most extremity (figs. 18. 19. 20). The complex stellates 

 are rather irregular in form. and approach, partly. to the 

 fusiform; they measure 0.152""" in length. and 0.068""" 

 in breadth (fig. 21 ). The quadruplet approaches to the 

 cruciform. and is beset with papillæ; it measures 0.08 

 in length. and 0.060""" in breadth (fig. 22). 



On the lowest part of the stem. racemates and ellip- 

 tie fusees, similar to those spoken of above, are the most 

 frequent forms. Here. also. the complex stellates are more 

 rare. whilst clavates and bistellates are more frequent, hut. 

 vet. not so frequent as in the basal part, Besides these. 

 a few quadruplets are found, and not so very rarely, also. 

 globular conglomerations of calcareous spheres, and straight 

 fusees beset with papillæ. Of the few quadruplets which 

 are found. some are cruciform and beset with round papillæ; 

 they measure 0.096""" in length. and have a transversal 

 arm measuring 0.088 (fig. 2;!); others have a very irre- 



