159 



I 



ger ind i de horaagtige Appendices. Denne Hud dannes 

 af flere Lag. eller Membraner, der ere temmelig fast hæf- 

 tede til hverandre og vanskelig lade sig adskille. Den 

 ydre Membran (Hypodermis, Claus) er temmelig tynd, har 

 en cellet Structur og er optaget af en stor Masse Pig- 

 mentklumper. Dette Pigment, der har en smuk dyb violet 

 Farve, er især rigt og tæt afsat paa den nederste og 

 tykkere Brystdel samt Abdominaldelen, hvor det ligesom 

 ringformigt afleirer sig, svarende til de i Chitinhuden tid- 

 ligere omtalte Rynker» Paa den smalere Brystdel bliver 

 Pigmentet tyndere og findes kun sparsomt paa Hovedet 

 og i Hornene, medens det derimod er rigere i Abdomi- 

 nal tilhænget. Den indre Membran, der er endnu tyndere 

 end den ydre, er næsten gjennemsigtig, har en fibrillær 

 Bindevævsstructur, hvori sparsomt kjerneholdige Celler 

 ere indleirede. Denne Membran fæster sig til Tarmens 

 Sider og beklæder dens hele bagerste Flade, hvorved der 

 fremkommer et næsten trekantet Rum, der indtager Dy- 

 rets hele Rygflade, og som i levende Live er fyldt med 

 rødt, tyndtflydende Blod. Det er ogsaa en Forlængelse 

 af denne indre Membran, der beklæder som et Peritone- 

 um ikke alene den forreste Flade af Tarmen, men ogsaa 

 de øvrige indre Organer og bidrager derved til at be- 

 fæste disse. Imellem disse to Membraner eller Lag er 

 da det egentlige Hudparenchym, der bestaar af et tem- 

 melig stærkt Bindevæv, hvori findes et udbredt Kanal- 

 system 1 ) og større og mindre Fedtlag. 



Den føromtalte Rygkanal er paa den tykkere og ne- 

 derste Brystdel meget vid, indtager hele Tarmens Bredde, 

 medens den opad bliver yderst smal, og har paa den 

 lange, småle Brystdel et saa ringe Lumen, at et Heste- 

 haar vanskeligen kan indbringes deri. I Abdominaldelen 

 bliver Kanalen ogsaa meget smalere, men dog ikke saa 

 smal som i Brystdelen. I denne lange Rygkanals Side- 

 vægge sees en Mængde yderst fine Spalter, der føre ind 

 til det ovennævnte sarcodelignende Bindevæv, hvis fine 

 forgrenede Kanaler sandsynligvis tjene som Circulations- 

 gange for Blodet. 



Det omtalte Fedtlag er paa de fleste Steder ikke 

 meget tykt, omend det kan danne enkelte Fedthobe; men 

 paa den øverste Brystdel, ligesom i Hovedet og Hornene, 

 danner det et tykt Polster, der udfylder disse Dele. 

 Fedtlaget er sammensat af Fedtceller, der tildels ere for- 

 grenede, det vil sige, der findes en eller flere Udløbere 

 paa Cellen. 



Tarmkanalen begynder fra den tidligere omtalte 



2 ) Claus omtaler et lignende Kanalsystem hos Lernaeocera 

 esocina Pag. 9, Tab. 1, Fig. 8. Beobachtungen über Lernaeocera, 

 Peniculus und Lernaea von Professor B. Claus. Marburg 1868. 



any other structure. Inside of this there is a rather 

 thick, nearly black-colored cutis, enclosing all the interior 

 organs, extending into the horns, lining the interior wall 

 of the head, and going, in the abdominal part, through 

 minute apertures into the plumose filaments. The cutis 

 is formed of several layers or membranes, which are 

 rather firmly attached to one another, and are difficult 

 to separate. The exterior membrane (Hypodermis, Claus?) 

 is rather thin, has a cellular structure, and contains a 

 great quantity of pigment in lumps. This pigment, which 

 has a beautiful, deep violet color, is richly and densely 

 deposited, especially on the lowest and thicker thoracic re- 

 gion; as also in the abdominal part, where it appears 

 to lie in rings answering to the corrugation in the chi- 

 tinous integument previously noticed. On the narrower 

 thoracic part, the pigment becomes thinner, and appears 

 only sparsely in the head and horns; while, on the con- 

 trary, it is more abundant in the plumose filaments. The 

 interior membrane, which is still thinner than the ex- 

 terior, is nearly transparent, has a fibrillous structure of 

 connecting tissue, wherein are imbedded cells containing 

 nuclei. This membrane is attached to the sides of the 

 intestine, covering the whole of the latter's posterior sur- 

 face, whereby there is produced a nearly triangular space, 

 which occupies the whole of the animal's dorsal surface, 

 and which during life is full of red, thin]y flowing blood. 

 It is also a continuation of this interior membrane which 

 covers, like a peritoneum, not only th« anterior surface 

 of the intestine, but also the other internal organs, and 

 contributes thereby to attach them. Between these two 

 membranes or layers, is the proper cuticular parenchym 

 consisting of a rather strong connecting tissue, in which 

 there is found an extensive vascular system *), and larger 

 and smaller layers of adipose. 



The dorsal canal previously noticed, is, in the thicker 

 and lowest thoracic part, very wide, occupying the whole 

 breadth of the intestine, while upwards it becomes ex- 

 tremely narrow, and has on the long, narrow, thoracic 

 part so minute a lumen, that it would be difficult to 

 insert a horse-hair. In the abdominal part, the canal 

 becomes also much narrower, but still not so narrow aa 

 in the thoracic part. In the lateral walls of this long 

 dorsal canal, there appear a number of extremely fine 

 fissures leading into the sarcode-like connecting tissue; 

 the minute ramified canals of which serve probably as 

 passages for the circulation of the blood. 



The layer of adipose matter noticed, is in most places 

 not very thick, although it can form isolated fatty agglo- 

 merations; but in the upper thoracic part, as also in 

 the head and horns, it forms a thick stuffing filling these 

 parts. The adipose layer is composed of cells of fat, 

 which are partly ramified, that is to say, we find one or 

 more ramifications on the cell. 



The intestinal canal begins from the oral aperture 



*) Claus notices a similar system of vessels in the Lernaeocera 

 esocina, pag. 9, Tab. 1, fig. 8. Beobachtungen über Lernaeocera, 

 Peniculus und Lernaea, von Professor B. Claus. Marburg 1868. 



