14 



saaledes som Gegenbauer afbilder det bos Rbizopbysa 

 filiformis (Zeitschr. f. wiss. Zool. B. 5, 1854). Overalt 

 mellem bine store findes, og det endnu talrigere, meget 

 mindre Nesselkapsler (c, c), indtil i — £ Del af bines Stør- 

 relse og af næsten kuglerund eller ganske lidt oval Form, 

 bvilke indslutter en ligedan formet, men kun balvt saa 

 stor Blære som den ydre og uden synlig Nesseltraad. 

 Disse Kapsler synes at fremstille yngre Tilstande af de 

 ovenfor beskrevne større, i bvilken Formodning jeg blev 

 bestyrket ved Forekomsten af andre Kapsler (b, b), bvilke 

 med Hensyn til Størrelsen omtrent stode midt imellem 

 begge bine Slags og viste Spor af den fremvoxende Nes- 

 seltraad i Form af en smal Tap paa Væggen af den indre 

 større blevne Blære, 



Endelig forekomme ogsaa spredte overalt mellem de 

 forrige endnu mindre Kapsler (d, d) af elliptisk Form, i 

 bvilke, formedelst deres ringe Størrelse, ingen Nesseltraad, 

 om en saadan findes, kunde bemærkes. 



Det er ikke sjeldent bos Exemplarer af denne Hy- 

 droide, som ere satte i Spiritus, at bemærke med Lupen 

 Tentaklerne overalt at være bedækkede med en Laaden- 

 bed af talløse overordentlig fine Smaatraade af en Længde 

 som overgaar noget Tentaklernes halve Tværdiameter. 

 Denne ligesom Skimmel udseende Laadenbed er ikke 

 andet end de fra de talrige Nesselkapsler fremstrakte 

 stive Nesseltraade. 



Paa Køllens øvre coniske Del benimod Munden sidde 

 de meget talrige (vel ikke langtfra 100) øvre Tentakler 

 (Tab. 1, Fig. 14, 19, s) spredte uden nogen synlig Orden. 

 De ere ligeledes traaddannede, men meget korte og tynde; 

 de ere af samme Beskaffenhed som de nys beskrevne 

 nedre eller lange, og bave samme Slags Nesselkapsler af 

 bvilke den største Form dog ber var af meget ringere 

 Størrelse og mindre talrig. — Begge Slags Tentakler ere 

 gennemsigtige med et svagt Anstrøg af Kosenrødt. 



Tæt ovenfor de nedre eller lange Tentakler sidde, 

 som sædvanligt, de gemmebærende Stilke (Fig. 14, 19, 

 g, g), dannende en Krands eller enkelt Rad. Deres Antal 

 er omtrent 30—35. Saaledes talte jeg bos et Exemplar 

 af middels Størrelse 27 større og bist og her mellem og 

 under disse 6—8 meget mindre eller fremvoxende. De 

 udmærke sig bos nærværende Art ved deres tykkere, mere 

 robuste cylindriske Form (Tab. 2, Fig. 1—3), ved deres 

 intensive rosenrøde Farve, som falder i Øinene fremfor 

 andre Dele af Dyret, samt derved, at de saagodtsom ingen 

 Grene have, idet Gemmerne som oftest sidde enkeltvis 

 langs opad Stilkens Sider eller undertiden flere tilsammen 

 i Smaabobe paa en ganske kort og but Sidegren (Fig. 3). 

 Antallet af Gemmer paa en saadan Stilk er kun ringe i 

 Sammenligning med C. nutans; de mest udviklede (a é ) 

 sidde paa eller nær ved den ydre Ende af Stilken, og 

 ere 1 — 1^ M.m. lange og omtrent balvt saa tykke, altsaa 

 forholdsvis mindre end bos C. Sarsii, men større end hos 

 C. nutans. 



Disse Gemmers Bygning er den mærkværdigste Sære- 

 genhed ved vort Dyr og ganske afvigende fra hvad vi 

 hidtil have seet hos de foregaaende Arter, som alle pro- 



physa filiformis (Zeitschr. f. Wiss. Zool., B. 5, 1854) 

 Everywhere among the larger thread-cells described 

 there are still more numerous much smaller ones (c c) 

 of J or |- of the size of the former, and of nearly glo- 

 bular, or very slightly oval form, containing a vesicle of 

 the same shape, but only half as large, as the exterior 

 and without any apparent urticary filament. These cells 

 appear to represent younger states of the above-described 

 larger ones, in which presumption I was confirmed by 

 observing other cells (b, b) which in respect of size stood 

 midway between the two sorts, and exhibited a sign of 

 the nascent urticary filament in a smal plug on the wall 

 of the interior more developed vesicle. 



Finally there occur, dispersed everywhere among the 

 former, still smaller thread-cells {d, d) of elliptical form, 

 in which by reason of their minute size no urticary fila- 

 ment, even if any such existed, could be discovered. — 



It is not uncommon, in specimens of this Hydroid pre- 

 served in spirit, that the tentacles can with the help of 

 a magnifying glass be discerned to be covered every- 

 where with a sort of fur, of innumerable extremely fine 

 filaments, somewhat exceeding in length half the trans- 

 verse diameter of the tentacle. This fur which looks like 

 mould, consists only of the. stiff urticary filaments extended 

 from the thread-cells. 



On the upper conical part of the club, towards the 

 mouth, there are very numerous (not far from 100) upper 

 tentacles (Tab 1, üg. 14, 19, s) distributed without any 

 apparent order. They are likewise filiform but very 

 short and thin; they are of the same nature as the lower 

 and longer tentacles previously described, and have the 

 same sort of thread-cells, of which the largest are however 

 very minute and less numerous. Both kinds of tentacles 

 are transparent with a slight roseate tint. 



Close above the lower or long tentacles, are situated 

 as usual, the germ-bearing stems (fig. 14, 19, g, g) forming 

 a circle or a single row. Their number is about 30-35. 

 I counted in one specimen of middle size, 27 larger, and 

 here and there among them 6—8 smaller or nascent 

 stems. Those of the present species are distinguished 

 by their thicker more robust cylindrical form (Tab. 2, 

 %• 1—3), by their more intense rosy color, which strikes 

 the eye more than in other parts of the animal, and by 

 their being almost without branches; as the gonozooids 

 most frequently sit isolatedly along the sides of the stem, 

 or sometimes several together in small clusters on a very 

 short and truncated side-branch (fig 3). The number of 

 gonozooids on such a stem is small in comparison with 

 C. nutans; the most developed (a 4 ) are at, or near the 

 extremity of the stem, and are 1— 1 * M.m. long and about 

 half as thick; smaller therefore relatively than in C. Sarsii, 

 but larger than in C. nutans. 



The structure of these gonozooids is the most remark- 

 able peculiarity of our animal, and quite different from 

 what we have hitherto seen in the foregoing species, 



