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bos Sagartia parasitica, Adamsia diaphana, Tealia crassi- 

 cornis o<j. Anthea cereus, hvilke alle havde særskilt Kjøn 

 saaledes, at de undersøgte Exemplarer af Anthea og Adam- 

 sia vare Hunner, imedens de af Tealia og Sagartia vare 

 Hanner. Testiklerne hos disse sidste ere ifølge de nævnte 

 Forfattere byggede efter samme System som Æggestokkene ; 

 men saaledes forholder det sig ikke ganske hos Allantactis 

 parasitica. der som ovenfor nævnt er Hermaphrodit. 



Imedens Æggestokkene ere i stor Mængde tilstede, 

 ere Testiklerne vistnok meget sjeldnere. Kun paa et Sep- 

 tum af 2'lt'n Orden fandtes fuldt udviklede Testikler, der 

 udfyldte ganske Kammeret af 2den Orden. De indtog om- 

 trent samme Plads paa Septum som Æggestokkene, men 

 vare ikke som disse saa intimt fæstede til dette. De vare 

 dannede af en stor Mængde større og mindre, slangeformige 

 Ror. der vare leirede i et Mesenterium, som var tykt og 

 temmelig last ved Tilheftningsstedet paa Septum, men sum 

 forøvrigt var yderst tyndt, men bredt. Rørene, der egent- 

 lig vare Blindsække, dannede [Bundter, Tab. IX, Fig. .'i. 

 og havde en hvid Farve; de bestode af en tynd, gjennem- 

 sigtig Binde vævsmembran. paa hvis ydre Flade var et 

 Epithel, der dog var saa sønderrevet, at det ikke nærmere 

 lod siii bestemme. Den indre Flade afSækken var beklædt 

 med et Endothel. der bestod af temmelig store, næsten 

 runde Celler med en rund Kjerne omgiven af finkornet 

 Protoplasma. Endel af disse Blindsække syntes at være 

 tomme, imedens de Heste vare mere eller mindre udfvldte 

 af yderst smaa, næsten rande, glindsende Organer, der ved 

 let Tryk spredte sig udover hele Synsfeldtet. Jeg anser 

 disse Smaalegemer for endnu ikke fuldt udviklede Sperma- 

 tozoer; nogen Hale var ikke at opdage. 



En Stund var jeg i Tvivl om, hvorvidt denne Sam- 

 ling af Blindsække var virkelige Testikler, eller om de ikke 

 muligens kunde være Acontier, hvoraf jeg hidtil ei havde 

 fundet Spor, trods nøiagtig Undersøgelse af 2 vel kon- 

 serverede Exemplarer; men Tvivlen svandt snart ved 

 Hjælp af Mikroskopet. Acontierne ere jo lange, næsten 

 runde, spiralformet oprullede Legemer, uden noget egent- 

 ligt Indhold. men rigt besatte med Nematocyster og kan 

 betragtes som traadformige Neldebatterier, altsaa ganske 

 anderledes byggede end de ovenfor beskrevne Blindsække, 

 der vare aldeles fri for Neldeeeller. Den reiste Tvivl var 

 jo temmelig naturlig, da de hidtil kjendte Testikler hos 

 Actmierne have en Bygning i Overensstemmelse med Ægge- 

 stokkene, imedens de hos Allantactis parasitica optræde 

 under en meget forskjellig Form. som niere nærmer si^ 

 den, der er fælles for en hel Del Holothurideslægter. 

 Men ogsaa herfra adskille Testiklerne hos Allant. par. sig 

 blandt andet derved, at de slangeformede Blindsække ikke 

 ere delte eller forgrenede. At jeg kun fandt Testikler paa 

 et Septum. tor have sin Grund deri, at de hei' havde naaet 

 en vis Udvikling, imedens de paa andre Septa endnu var i 

 sin Vorden: thi jeg saa paa enkelte Septa at' 2deu Orden 

 en liden. aflang Fortykkelse, som muligens var den begyn- 

 dende Testikel. Imidlertid er der jo u>isaa en Muliehed 



in Sagartia parasitica. Adamsia diaphana, Tealia crassi- 

 cornis and Anthea cerius, all of whicb had separate sexes; 

 the specimens of Anthea and Adamsia examined being 

 females, whilst 'thuse of Tealia and Sagartia were males. 

 The testieles in these last are. according to the writers 

 named, constiucted on the same system as the ovaries ; 

 but this is not quite the case in Allantactis parasitica, 

 which, as above stated. is hermaphroditic. 



Whilst the ovaries are present in great abundance, 

 the tentacles are. assuredly, less frequent. Only on a sep- 

 tum of the 2nd order were fully developed testieles observed, 

 completely filling the chamber of the 2nd order. They 

 occupied about the same position on the septum as the 

 ovaries, hut. unlike these, were not sn closely attached tu it. 

 They were formed of a great multitude of larger and smal- 

 ler sinuous tubes, embedded in a mesentery that was 

 thiek and rather firm at the point of attachment to the 

 septum, but which otherwise was extremely thin. hut broad. 

 The tubes, which really were cæca, formed fasciculi (Pl. 

 IX. fig. .'i and had a white colour; they consisteil of a 

 thin. transparent, connective-tissue membrane, on whose 

 exterior surface there was an epitheliuru which was, 

 however, so torn asunder that it was not possible to clearly 

 determine it: the inner surface of the cæcuni was clad with 

 an endothelium that consisted of rather large, almost round 

 eells. containing a round nucleus surrounded by a minutely 

 granular protoplasm. Some of these cæca appeared to !"■ 

 einpty. whilst mosl of them, however, were more or L-s 

 filled with extremely small, almost round. shining organs, 

 which upon a slight pressure spread themselves out over 

 the entire area of observation. I consider these small 

 bodies to be not yet fully developed spermatozoa; a tail 

 was nut observable. 



For some time I was in doubt whether this collec- 

 t i < til of cæca were really testieles. or whether they were not 

 perhaps acontia, of which I had hitherto found no trace 

 in spite of the closest investigation of two well-preserved 

 specimens, hut the dubiety soon disappeared on obtaining 

 the aid of the microscope. The acontia are. it is known, 

 long, almost nmnd. spiral-formed, coiled up bodies. without 

 auy real contents. but richly beset with nematocysts, and 

 inay be considered tu he tilameiitous stinging båtferies, 

 consequently quite differently constructed from the above 

 described cæca, which were perfectly devoid of nematocysts. 

 The dubiety which I had was. indeed, quite natural. be- 

 cause the testieles hitherto known, pertaining to the Ac- 

 tinaria. have a structure conforming to that of the ovaries, 

 whilst in Allantactis parasitica they appear under a very 

 different form. mure resembling that which is common for 

 the entire genus of the Holothuridæ. But also from that. 

 the testieles in Allant. par. distinguish themselves; amongst 

 other things in this. that the sinuous cæca are not divided 

 or ramified. The fact that I found testieles on only one 

 septum may he owing to this. that there they had attained 

 a particular development, whilst in the other septa thej 

 were in their gemmation only; hecause I observed on a 

 few septa of the 2nd order, a small oblong swelling which was 



