& 
udvidede det sig til en temmelig stor aflang Blære, fyldt 
med vandklart Fluidum, Fig. 11, 6, blev saa smalt og rør- 
formigt igjen, forsynet med enkelte, yderst smaa Blærer, 
og fortsatte saaledes sit Løb op til Kalkringen, hvorpaa det 
fæstede sig, Fig. 11, ¢; det laa ganske frit, uden nogen 
anden Forbindelse med Tarmen end ved dets tragtformige 
Udvidning. Det venstre Rør udsprang ved Siden af det 
høire, var yderst smalt, todelt og besat med enkelte smaa 
Blærer; det laa frit i Kropshulheden, kun bundet til Huden 
ved enkelte fine Traade, Fig. 11, d. 
Hos et andet 20”” langt Individ vare heller ikke 
Generationsorganerne at opdage; men Rørene vare noget 
mere udviklede. Det høire tog sit Udspring ligeledes fra 
den sidste nedstigende Tarmslynges Væg med en tragtformig 
Udvidning, hvorved det fik Udseende, som om Tarmen paa 
dette Sted var opheftet, Tab. VIT, Fig. 10, a. Røret steg 
nu opover, blev tyndere, og var besat med temmelig mange 
smaa Blærer, indtil det fæstede sig paa Kalkringen, Tab. 
VII, Fig. 10, b, c. Ikke alene den tragtformige Udvidning, 
men ogsaa den smalere Del af Røret, ja endog flere Blærer 
vare opfyldte med det samme Indhold, som fandtes i den 
fuldproppede Tarm. Det venstre Rør udsprang i samme 
Niveau paa Tarmen, som det høire, et Stykke fra dette, 
var kort, todelt, temmelig tykt. og forsynet med nogle 
større og mindre Blærer. Saavel Røret, som samtlige Blæ- 
rer vare udfyldte af det lerede Tarmindhold, Fig. 10, d. 
Hos ingen af disse smaa Individer var der nogen Kloak; 
Tarmen gik lige ud til Halespidsen, og kun den yderste 
Del var bunden ved nogle stærkere Muskelbaand til Krop- 
pens Vægge. 
Paa disse Exemplarer viste det sig tydeligt nok, at 
de forgrenede Rør egentlig ikke er andet end udbugtede 
Forlængelser af Tarmen og høre denne til. Om noget 
Aandedræt kan her ikke være Tale; thi de vare enten 
ganske eller for en Del udfyldte af Tarmindholdet, som 
bestod af en temmelig fast Lermasse, og som forklares 
lettelig derved, at Aabningen fra Tarmen var særdeles vid, 
den indtog næsten hele den ene Tarmvæg. Der kan saa- 
ledes ikke være trængt Søvand op i disse Rør, og naar ikke 
destomindre flere Blærer vare fyldte af et næsten vandklart 
Fluidum, .saa hidrører dette visselig fra, at der foregaar en 
' Endosmose af Kropsvædsken. 
Jo mere Individet er skredet frem i Udvikling, desto 
smalere bliver den tragtformige Udbugtning, indtil den 
endelig hos det udvoxne Dyr antager den tynde Rørform, 
hvis Forbindelse med Tarmen da foregaar igjennem en 
trang Aabning; nu findes ikke i Rørene eller deres Blærer 
noget af Tarmindholdet, men vel en næsten vandklar, lidt 
klæbrig Vædske, tildels lig den, som indeholdes i Krops- 
hulheden, imedens Tarmen, hvorfra de have deres Udspring, 
kan være aldeles tuldproppet. De fyldte Rør med deres 
Blærer kunne saaledes ikke have deres Indhold fra ind- 
and almost translucent; it soon however expanded into a 
rather large, elliptic-shaped vesicle, filled with a pellucid 
fluid, fig. 11, 6, became again slender and tubular, exhi- 
biting a few minute vesicles, and thus continued its course 
to the calcareous on to which it was webbed, 
fig. 11, c; it lay quite free, having no connexion what- 
ever with the intestine save through the funnel-shaped ex- 
pansion. The left tube had its origin at the side of the 
right, was exceedingly narrow, bipartite, and furnished with 
ring, 
a few small vesicles; it lay free in the perivisceral ca- 
vity, attached to the integument by a few slender fila- 
ments, fie TIP a. 
In another specimen, length 20”, the generative or- 
gans could not be detected; but the tubes where somewhat 
more developed. As in the other example, the right tube 
originated on the wall of. the last descending convolution 
of the intestine, and was furnished with a funnel-shaped 
expansion, giving to the intestine the appearance of being, 
as it were, hitched up at this point, Pl. VII, fig. 10,a. The 
tube now began to ascend and grow narrower, exhibiting a 
considerable number of vesicles, till it reached the calcare- 
ous ring, to which it was webbed, Pl. VII, fig. 10, }, c. 
Not only the funnel-shaped expansion, but also the nar- 
rower portion of the tube, nay several of the vesicles even, 
were full of the clayey substance found in the distended 
intestine. The left tube had its origin on the intestine, in 
breast of the right, but some distance from it, was short, 
rather thick, bipartite, and furnished with a few vesicles; 
varying in size. Both the tube itself and all of the vesi- 
cles were full of the clayey substance distending the intestine, 
fig. 10, d. In none of these small animals was there a 
cloacum; the intestine protended to the tip of the caudi- 
form-extremity, the outermost portion only being webbed 
to the walls of the body by a few strong muscular bands. 
In these specimens it was evident that, in a strict 
sense, the ramose tubes are merely sinuous prolations of 
the intestine. As to their performing a respiratory office, 
that is quite out of the question; for they were either wholly 
or partially distended with the compact, clayey substance 
forming the contents of the intestine, which is readily ex- 
plamed by the fact of these ramose tubes passing into the 
latter through a remarkably wide opening, which occupied 
nearly the whole of one of the intestinal walls. Hence 
water cannot possibly be forced up into these tubes; true, 
several of the vesicles contained an almost limpid fluid; 
but an endosmose of the perivisceral fluid is sufficient to 
account for that. 
The more advanced the stage of development attained 
by the animal, the more slender does the funnel-shaped 
expansion become, till, in full-grown individuals, it assumes 
the slender, tubular form, its connexion with the intestine 
being then effected through a narrow opening. Now, neither 
the tubes themselves nor their vesicles contain any of the sub- 
stance that fills the intestine, but an almost pellucid, vis- 
cous fluid, bearing some resemblance to that in the perivisce- 
ral cavity, whereas the intestine, on the walls of which they 
originate, 1s sometimes wholly distended with fecal matter. 
