158 



reste Flade er temmelig kort, noget convex, stundom lidt 

 skulpteret (Tab. 16, Fig. 6 a), og her sees paa den øver- 

 ste og midterste Del ligesom en Fure, der fremkommer 

 derved, at de føromtalte Papiller her ere meget smaa i 

 Forhold til dem, som findes paa Siderne (Tab. 16, Fig. 7 b). 

 Fra Hovedets Grund, der altid er noget smalere end den 

 øvrige Del, udgaar næsten horisontalt tre lange, temmelig 

 tynde Horn, hvis frie Ende er afrundet (Fig. 1, 6, 7, 9). 

 Af disse Horn, der ere Dyrets Fæsteapparat, udgaa to 

 fra Siderne og et fra Ryggen. 



Den forlængede Del, som er bleven kaldt Brystre- 

 gionen (Thoraxregion), har en ganske overordentlig 

 Længde, og tager sin Begyndelse fra Hornene, hvor den 

 er meget tyk, noget fladtrykt forfra og bagtil, hvorved 

 fremkommer en tydelig Bug- og Rygflade (Fig. 1, 6 c). 

 Paa Bugfladens Midtparti findes 4 Par Fødder, af hvilke 

 de to øverste Par staa tættere sammen end de underste 

 (Fig. 1, 6 d). Omtrent 8 — 10 Mm. nedenfor Hornene 

 bliver Brystdelen meget smal, er ganske rund og antager 

 Formen af et Rør i en Længde af omtrent 180 Mm. (Fig. 



1 e), hvor den atter bliver tykkere og indtager nu en 

 betydelig Tykkelse ligetil den saakaldte Abdominaldel, 

 (Fig. 1 1), det Sted nemlig, hvor Æggetraadene tage deres 

 Udspring, Ogsaa denne tykkere Del er lidt fladtrykt for- 

 fra bagtil, og paa Bugfladen, langt nede, sees to runde 

 Papiller, paa hvis Midte findes en fin, rund Aabning (Fig. 



2 a, Heftepunkterne for Spermatophorerne?). Strax under 

 tage Æggetraadene deres Udspring, (Fig. 2 b); de ere 

 meget længere end hele Dyret. Nedenfor Genitalporerne 

 er da den Del, der er bleven benævnt Abdomen; den er 

 temmelig kort i Forhold til Brystpartiet, er mindre tyk 

 end dettes nederste Del og bliver smalere ned imod den 

 afstumpede Ende (Fig. 1 g), hvor der til hver Side findes 

 en fremragende Papille (Furcalglieder, Claus, Fig. 5 b). 

 Imellem' disse Papiller iagttages en Fure, i hvis Midte er 

 en temmelig fin Aabning, forsynet med en Ringmuskel 

 (Analaabningen). Paa hver Side af Abdominaldelen findes 

 en Række hornagtige Appendices, mindst 24 i Tal. Ethvert 

 saadant Tilhæng, der udgaar fra en rund, gjennemboret 

 Knude (Fig. 5 a), har en kort Stamme, hvorfra ud- 

 springe jævnligen 3 korte Hovedgrene, som dele sig i 3 

 eller flere lange udelte Grene (Fig. 8); denne Del faar 

 saaledes nogen Lighed med Fjæren paa en Skriver- 

 pen. Dyret er omgivet af en tyk, fast, halvgjennemsigtig 

 Chitinhud, hvis ydre Flade overalt er glat, naar undtages 

 paa Rygsiden af den tykkere, nederste Del af Brystpar- 

 tiet samt Abdominaldelen, hvor den er ligesom rynket 

 paatvers. Den indre Flade beklædes af en Cuticula, der er 

 hyalin, meget finstribet, men forøvrigt uden nogen anden 

 Structur. Indenfor denne findes en temmelig tyk, næsten 

 sortfarvet Hud, der indeslutter alle de indre Organer, 

 forlænger sig ind i Hornene, beklæder den indre Væg af 

 Hovedet og gaar i Abdominaldelen igjennemfine Aabnin- 



fig. 9 a); otherwise the posterior surface is smooth, plane 

 in the middle, but a little convex at the sides. The 

 anterior surface is rather short, somewhat convex, occa- 

 sionally a little sculptured (Tab. 16, fig. 6 a); and here 

 on the upper and central part, we see, as it were, a 

 furrow, occasioned by the before-mentioned papillæ being 

 at this place very small in proportion to those on the 

 sides (Tab. 16, fig. 7 b). From the base of the head, 

 which is always somewhat smaller than the remaining 

 part, there proceed nearly horisontally three long, rather 

 thin horns, the free extremities of which are rounded off 

 (üg. 1, 6, 7, 9). Of these horns, which form the animal's, 

 apparatus of attachment, two proceed from the sides., 

 and one from the back. 



The elongated part, which has been called the tho- 

 racic region, has quite an extraordinary length, and takes 

 its beginning from the horns; being at first very thick, 

 somewhat flattened from in front backward, thus producing 

 distinct ventral and dorsal surfaces (fig. 1, 6 c). In the 

 middle part of the ventral surface, there are 4 pairs of 

 feet, of which the two upper pairs stand closer together 

 than the two lower (fig. 1, 6 d). About 8—10 Mm. below 

 the horns, the thoracic part becomes very slender; it is 

 quite round, and takes the form of a tube for a length of 

 about 180 Mm. (fig. 1 e), when it again becomes thicker, 

 and occupies now a considerable thickness as far as to 

 the so-called abdominal part (fig. 1 f), namely to the 

 place whence the ovisacs take their origine. Also this 

 thicker part is a little flattened from in front backward; 

 and on the ventral surface, far clown, there appear two 

 round papillæ, in the middle of which there is a minute 

 circular aperture (fig. 2 a, the points of attachment for 

 the Spermatophores?). Immediately below, the ovisacs 

 take their origine (fig. 2 b) ; they are much longer than 

 the whole animal. Below the genital pores, there comes 

 then that part which has been called the abdomen; it is 

 rather short in proportion to the thoracic region, less thick 

 than the lower part of the latter, and becomes smaller 

 down towards the rounded extremity (üg. 1 g), where on 

 each side there is a projecting papilla (Furcalglieder, 

 Claus) (fig. 5 g). Between these papillæ, there is ob- 

 served a furrow, in the middle of which there is a rather 

 minute aperture provided with an annular muscle (the 

 anal aperture). On each side of the abdominal part, there 

 is a row of horny appendices, at least 24 in number. 

 Each of these, proceeding from a round, perforated tu- 

 bercle (fig. 5 a), has a short stem, whence there issue 

 regularly 3 short main branches, which divide themselves 

 into 3 or more long, undivided branches (ß.g. 8). This 

 part acquires thus some resemblance to the feather on 

 a quill pen. The animal is enveloped in a thick, solid, 

 semi-transparent, chitinous integument, the exterior surface 

 of which is everywhere smooth, except only on the dorsal 

 side of the thicker, lower part of the thoracic region, 

 and the abdominal part, where it is, so to say, corrugated 

 transversely. The interior surface is covered with a cuticle, 

 which is hyaline, very finely striped, but otherwise without 



