148 



Nedenfor Anus paa hver Side af den omtalte Søm, 

 altsaa paa Bugfladen, findes en hvid fremragende Vorte 

 af et Knappenaalshoveds Størrelse, omgivet af en 

 Krands yderst smaa runde Papiller, og paa hvis mid- 

 terste Del er en yderst fin Aabning (Genitalporen). 

 Tarmrøret, der, om man vil, bestaar af 3 Dele, Svæl- 

 get, Mellemtarmen og Endetarmen, begynder ved Mund- 

 aabningen, og løber i ret Linie bag mod Legemets 

 Ende, hvor det udmunder i den tidligere beskrevne 

 Anus. Tarmrøret er kun ved Mund og Anus fæstet til 

 Kropshulheden, og har baade paa Ryg- og Bugfladen en 

 fin hvidagtig Streng (Kar), der er forbunden til Tarmen 

 ved Bindevæv. Svælget er temmelig vidt, især fortil, og 

 har en Længde af omtr. 10 Mm. Det er forsynet med 

 8 Rækker Tænder, hvoraf de 4 forreste Rækker ere de 

 største, kunne sees med blotte Øine, og have en ensartet 

 Bygning, der kun varierer med Hensyn til Størrelse, ime- 

 dens de 4 bagerste Rækker, som kun vanskeligen kunne 

 sees med ubevæbnet Øie, have en noget forskj eilig Byg- 

 ning fra de forreste. I den første Række staa 5 store, 

 haarde, hornagtige, ravgule Tænder, hvis Basis sidder lige- 

 som nedsænket i en liden rund, fast, ophøiet Knude, og 

 hvis store Spids (Fig. 12 a, a) ligner et Papagøinæb og rager 

 frit bagtil og indad i Svælget. I de øvrige 3 Rækker er 

 der fra 8 — 12 mindre; aldeles lignende Tænder. Hver 

 Tand dannes af en Basaldel (Rod) og af en Krone. Ba- 

 saldelen, der er fæstet i den omtalte Knude, har en fem- 

 kantet Form, saaledes at de to Hjørner staa inderst mod 

 Svælgvæggen, og de tre, som indtage den bredere Del af 

 Tandroden, staa yderst. Kronen rager op fra Rodens 

 bredere, trekantede Del, bestaar af 14— 15 Spidser, hvoraf 

 den midterste er omtr. 3 Gange saa lang og tyk som de 

 øvrige, er stærkt krumbøiet, glat, og springer med sin 

 spidse Ende frit ud i Svælget. Paa hver Side af denne 

 Spids staar en Række 6—7 meget mindre Spidser, der 

 ligeledes ere krumbøiede, have omtrent samme Form 

 som den store og vende mod denne. Alle disse Spidser 

 ere i Forhold til Svælgvæggen rettede bagtil og indad. 

 I de 4 bagerste Tandrækker findes et langt større Antal 

 meget smaa Tænder. Disse have en næsten firkantet Ba- 

 saldel, hvorfra udspringer en noget krumbøiet Midtspids 

 (Fig. 13 a), paa hvis Sider sidde 6—8 mindre Spidser, der 

 aftage i Størrelse, alt eftersom de nærme sig Midtspid- 

 sens yderste, spidse Ende. Den hele Tand har nogen 

 Lighed med en Pyramide, hvis øverste Sidekanter ere 

 stærkt saugtakkede. Hvor Svælget gaar over i den egent- 

 lige Tarm, er en Indsnøring. Fra denne udvider Tar- 

 men sig stærkt, gaar bagover, idet den bliver alt sma- 

 lere og smalere, indtil den gaar over i Rectum. Den 

 egentlige Tarm er omtr. 22 Mm. lang; Rectum er omtr. 

 8 Mm. lang, temmelig smal, meget musculøs og udmunder 

 i Midten af Legemet, noget nærmere Rygsiden. Paa hver 

 Side af Rectum findes et aflangt, bladformigt, lappet Or- 

 gan (Kjønsorganet), omtr. 20 Mm. langt og paa det Bredeste 

 omtr. 4 Mm. Dets forreste, frie Ende er conisk tilspidset; 

 dets bagerste, bredere Del gaar successivt over i en tem- 

 melig tynd, rund Udførselskanal, som udmunder i den 



Below the anus, on each side of the suture men- 

 tioned, that is on the ventral surface, there is a white 

 prominent wart of the size of a pin's head, surrounded 

 by a circlet of extremely small, round papiliæ, and having 

 in its central part an extremely fine aperture (the genital 

 pore). The intestinal canal, which, so to say, consists of 

 3 parts, the gullet, the middle instetine and the rectum, 

 begins at the oral aperture and runs in a straight line 

 backward towards the end of the body, where it has its 

 eduction through the anus previously described. The 

 intestinal canal is only attached at the mouth and at 

 the anus to the perivisceral cavity, and has, both on the 

 dorsal and the ventral surface, a fine whitish cord (vessel), 

 which is attached to the intestine by connecting tissue. 

 The gullet is rather wide, especially in front, and has a 

 length of about 10 Mm. It is furnished with 8 rows of 

 teeth, of which the 4 anterior rows are the largest and 

 may be seen with the naked eye. These have a uniform 

 structure, and vary only in respect of size; while the 4 

 posterior rows, which can only with difficulty be perceived 

 by the unassisted eye, have a very different structure 

 from the others. In the first row there are 5 large, 

 hard, horny, amber-yellow teeth, the basis of which is 

 planted, as it were, in a little, round, firm, elevated 

 tubercle, and the large point of which (fig. 12 a, a) resembles 

 a parrot's beak and projects freely backward and inward 

 in the gullet. In the other 3 rows, there are from 8—12 

 smaller, entirely similar teeth. Every tooth is formed of 

 a basal part (root) and of a crown. The basal part, 

 which is fixed in the tubercle mentioned, has a pentagonal 

 form; so that the 2 angles are inside towards the wall 

 of the gullet, and the 3, which are in the broader part 

 of the root of the tooth, lie outwards. The crown pro- 

 jects up from the broader three-cornered part of the 

 root, and consists of 14 — 15 points, of which the middle 

 one is about 3 times as long and thick as the others. 

 It is strongly crooked, smooth, projecting freely with its 

 pointed end in the gullet. On each side of this point 

 there stand in one row 6—7 much smaller points, which 

 are likewise crooked, having the same form as the larger 

 one and turning towards it. All these points are, in 

 relation to the wall of the gullet, directed backward and 

 inward. In the 4 posterior rows of teeth, there are a 

 much greater number of very small teeth. These have a 

 nearly quadrangular base, whence there issues a somewhat 

 crooked middle point (fig. 13 a), on the side of which 

 there are 6—8 smaller points diminishing in size as they 

 approach the extremely fine apex of the middle point. 

 The whole tooth has some resemblance to a pyramid, 

 the upper side edges of which are strongly serrated. 

 Where the gullet goes over into the proper intestine, there 

 is an instriction. From this the intestine becomes strongly 

 enlarged, and then goes backward, becoming narrower and 

 narrower, until it goes over into the rectum. The proper 

 intestine is about 22 Mm. long, the rectum is about 8 Mm. 

 long, rather narrow, very muscular and has its aperture in 

 the middle of the body a little nearer to the dorsal side. 



