24 



Resultater, hvortil jeg er kommet, stemmer idethele 

 temmelig vel overeus med hvad Claus her har med- 

 delt. Paa Tab. V fremstiller Fig. 1 en Hun seet 

 fra Siden og stærkt forstørret, med de forskjellige 

 Organer indtegnede i samme og anlagte med for- 

 skjellige Farver. Fig. 2 fremstiller et Tværsnit af 

 Legemet omtrent over Midten af Truncus; de indre 

 Organer er anlagte med samme Farve som paa 

 Hovedfiguren. 



Tarmtractus- 



Spiserøret er meget kort og stiger fra Mund- 

 aabningen lodret i Veiret, forbindende sig under en 

 næsten ret Vinkel med den forreste, i Hovedet lig- 

 gende Del af Tarmen. Dette forreste Afsnit af 

 Tarmtractus er forsynet med et temmelig compli- 

 ceret Chitinskelet (Tab. V, Fig. 3, 4) og danner saa- 

 ledes et Slags Tyggemave, noget lignende den hos 

 Amphipoderne forekommende. Paa Chitinskelettet 

 kan adskilles 3 Hoveddele, en forreste, en midterste 

 og en bagers ce Del. Den forreste Del er noget 

 affiadet og'indeholder 2 fortil divergerende Lister, 

 besatte med en dobbelt Rad af fine, tæt sammen- 

 trængtp Chitinpigge. Lige ved Indgangen til Spise- 

 røret ^indes desuden ventralt 2 parvise Forhøininger, 

 besatte med indadrettede Borster. Den midterste 

 Del er temmelig stærkt opsvulmet og bagtil skraat 

 a^jkaaret, dannende her en næsten klokkeformig 

 Ldvidning, hvorfra rager frem et Par tæt haarede 

 Flige. Det er her at de til Tarmen hørende Lever- 

 sække forener sig for at udmunde i Tyggemavens 

 Lumen. Den bagerste Del, endelig, danner en lang 

 skedeformig, og i de frie Kanter med fine Børster 

 besat tynd Flig, der kun indtager Dorsalsiden af 

 Tarmen og med sin i en fin Spids udtrukne Ende 

 rækker langt ind i selve Truncus. Tarmen danner 

 forøvrigt et simpelt cylindriskt, med stærke Ring- 

 muskler forsynet Rør, der strækker sig igjennem 

 hele Midtkroppen. Bagkroppen og Mesteparten af 

 Halen. Ved Enden af næstsidste Halesegment for- 

 binder den sig med en kort. stærkt muskuløs Ende- 

 tarm, der aabner sig nedenunder Basis af Halegre- 

 nene. Af Leversække findes ikke mindre end 4 Par, 

 alle særdeles tynde og saa fast forbundne med Tar- 

 men med fedtholdigt Bindevæv, at de yderst vanske- 

 ligt lader sig isolere fra samme. Det forreste af 

 disse Par er meget korte og rettede fortil over 

 Tyggemaven, medens de 3 øvrige Par følger Tarmen 

 bagud og ender omtrent ved Begyndelsen af Halen. 

 Paa Tværsnit (Fig. 2) viser disse sidste (cd, cv) sig 

 grupperede næsten i Form af en Rosette omkring 

 og tæt ind mod Tarmen, med et noget større Mel- 

 lemrum mellem det dorsale Par. 



nified figures of male and female, presented as 

 transparent objects. The results at which I have 

 arrived agree, upon the whole, pretty well with 

 what Claus has here stated. Plate V, fig. 1 repre- 

 sents a female viewed laterally and greatly magni- 

 fied, with the various organs drawn in the repre- 

 sentation and coloured with diff'erent colours. Fig. 2 

 represents a transversal section of the body across 

 nearly the middle of the triincus ; the internal organs 

 are coloured with the same colours as in the chief 

 figure. 



The intestinal tract. 



The oesophagus is vpi-y «hort auu rises per- 

 pendicularly from the oral aperture, connecting 

 itseir at almost a right angle with the foremost 

 part of the intestine situated in the head. That 

 foremost section of the intestinal tract is fur- 

 nished with a pretty complicated chitinoixs skeleton 

 (PL 4, fig. 3. 4) and forms thus a kind of mastica- 

 tory stomach, somewhat like what is present in the 

 Amphipods. Thi'ee chief parts may be distinguished 

 in the chitinous skeleton, a front one, a medial one, 

 and a back one. The front portion is somewhat 

 flattened and contains 2 fillets which diverge to 

 the front and are beset with a double series of fine, 

 closely crowded chitinous .spikes. Exactly at the 

 mouth of the oesophagus there are further found, 

 ventrally, 2 prominences in pairs, beset with bristles 

 directed inwards. The medial part is pretty greatly 

 swollen out and obliquely truncated behind, forming 

 here a neai'ly bell-shaped dilation, from which a 

 pair of densely hirsute flaps project. It is here 

 that the liver-sacs pertaining to the intestine 

 unite, in order to debouch into the cavity of the 

 masticatory stomach. The posterior part finally 

 forms a long sheath-like thin flap which is, on its 

 free edges, beset with fine bristles, and only occupies 

 the dorsal side of the intestine; and which, with its 

 extremity drawn out to a fine point, extends far 

 into the truncus itself. The intestine forms, other- 

 wise, a plain cylindrical tube furnished with strong 

 ring-muscles, which extends itself through the entire 

 mesosome, the metasome, and the greater part 

 of the urosome. At the extremity of the pen- 

 ultimate caudal segment, it connects itself to a short, 

 strongly muscular rectum which opens below the 

 base of the caudal rami. Of liver-sacs there are 

 no less than 4 pairs found, all of them particularly 

 slender, and so firmly connected to the intestine by 

 fatty connective-tissue that it is extremely difficult 

 to isolate them from it. The foremost pair of these 

 sacs is very short and directed forwards above 

 the masticatory stomach, while the 3 other pairs 

 follow the intestine backwards and terminate at 

 about the beginning of the urosome. La trans- 

 versal sections (fig. 2) tliese last show themselves 



