skopisk Forstørrelse (Gunlach Im. No. 7, Oc. 1) at iagt- 
tage nogensomhelst Organisation; forst ved Farvning af en 
Opløsning af Picrokarmin, differentserede de forskjellige 
Vær sig. Indenfor Muskelhuden er Peritonealovertrækket. 
Fordøielsestragten tager sin Begyndelse ved den runde 
Mundaabning, der er. omgivet af en Vold, som væsentlig 
dannes af Ringmusklerne, tig. 3, b. 
Spiserøret er cylindrisk, Fig. 3, c, hdt videre ved 
Mundatriet, omtrent 8”” langt, og har en tyk, fast, hvid- 
rødlig Hud, der dannes af de sædvanlige Lag, dog saaledes, 
at Muskelhuden, der bestaar af Ring- og Længdemuskler, 
er meget tyk; indenfor denne er et kjernerigt Bindeværv, 
der danner listeformige Fremspring, som foranlediger de 
paa den indre Flade af Spiserøret langsgaaende Folder. 
Til dette Bindevæv er Epithellaget fæstet, som bestaar af 
temmelig lange Cylinderceller, hvoraf «mange have foruden 
sin Kjerne et rigt kornet Indhold, og muligens fungere 
som Kjertler. 
Naar Spisergret, der ved stærke Bindevævstraade er 
bundet til Kropsvæggen, har naaet bag imod den glasklare 
Kropsdel, udvider det sig og danner en aflang Sæk, der 
" ligeledes er stærk muskuløs og kan betragtes som en Mave, 
Fig. 3, d, hvis Vægge blive tyndere, idet den gaar over i 
Tarmen, Fig. 3, e, uden at der egentlig er nogen Indsnø- 
ring. 
Tarmen bliver nu temmelig smal, dreier sig mod 
Høire, hvorfra den bøier sig og gaar til Venstre; paa denne 
Vei ere dens Vægge blevne alt tyndere og tyndere; men 
fra nu af gjør den en Mangfoldighed af Slyngninger, saa 
den ganske udfylder den glasklare, kugleformige Del, Fig. 
2, f; 3, f, paa samme Tid som dens Vægge blive saa tynde, 
at det ser ud som der ingen Tarm var. 
denne Vei har naaet den bagerste Del af Kropshulheden 
gaar den over 1 en kort Rectum, Fig. 3, g, der ender med 
sin runde Analaabning paa Midten af den lidt fremstaaende 
koniske Bagdel, Fig. 2, e. 
Endetarmens Vægge ere tykke og faste, omtrent som 
Spiserørets, og dens ydre Flade er ved en Mængde temme- 
lig stærke, tendinøse Baand bundet saavel til den glasklare 
Seks indre Veg, som til den koniske Fremstaaenheds indre 
Flade, Fig. 3, h, imedens dens ydre Rand, der danner 
Anus, er omgiven af en stærk Sphincter. 
Muskelhuden paa Tarmen er, naar-undtages Rectum, 
særdeles tynd, og Muskelfibrene i begge Lag staa meget 
langt fra hverandre. Paa Rectum derimod ere de tykke 
og sammenhængende. 
Tarmens indre Flade er bekledt med et lignende 
Epithel, som Spiserørets, kun staa Cylindercellerne længere 
fra hverandre; men ogsaa her havde mange det føromtalte 
kornede Indhold. 
Tarmen var ganske opfyldt af Excrementer; disse be- 
stode af Boli, der havde en elliptisk Form, og vare paa Midten 
saa tykke, at en saadan Bolus udfyldte ganske Tarmen, Fig. 3, 7. 
Naar den paa” 
36 
to detect, even with a powerful microscope (Gunlach Im. 
No. 7, Oc. 1), any structural appearance whatever; not till 
a portion had been tinted in a solution of picrocarmine, 
could the several species of tissue be observed. Underneath 
the muscular membrane extends the peritoneal tunic. | 
The ‘alimentary canal originates at the round buccal: 
aperture, which is encompassed by a ridge, chiefly consist- 
ing of annular muscles, fig. 3, b. 
The æsophagus is cylindrical, fig. 3, ¢, a trifle wider at 
the buccal atrium, about 8”” long, and has a thick, firm- 
textured whitish-red skin, built up of the usual layers, the 
muscular integument, composed of annular and longitudinal 
muscles, being however very thick. Underneath this integu- 
ment extends a layer of nucleal connective tissue, forming 
cornice-like projections, which give rise the longitudinal folds 
on the inner surface of the esophagus. To this connective 
membrane is webbed the epithelial layer, composed of com- 
paratively long cylindrical cells, many of which contain, ex- 
clusive of the nucleus, a granulous substance, and possibly 
perform the function of glands. 
On the esophagus, which is webbed by strong filaments 
of connective tissue to the wall of the body, reaching back 
towards the hyaline portion of the latter, it expands, forming 
an oblong sae, also highly muscular, and which may be regarded 
as a stomach, fig. 3, d, with walls of diminished thickness 
where it passes into the intestine, fig. 3, e, though there 
is no instriction. 
The intestine now becomes comparatively slender, 
swerves to the right, then makes a bend, striking off to 
the left, its walls getting thinner and thinner; but it now 
commences’ a series of eireumvolutions, entirely filling 
up the hyaline globular portion, figs. 2, f; 3, fy and its 
walls become so thin, that it almost loses the appearance 
of an intestine. On thus reaching the posterior portion 
of the perivisceral cavity, it opens into a short rectum, fig. 
3, g, terminating in the round anal aperture, which occu- 
pies the centre of the acuminate and slightly projecting 
posterior portion, fig. 2, e. 
The walls of the rectum are thick and firm-textured, 
much the same as those of the æsophagus; and its outer sur- 
face is webbed by numbers of comparatively strong tendi- 
nous bands both to the inner wall of the hyaline sac and 
to the inner surface of the acuminate prominence, fig. 3, h, 
whereas its outer margin, forming the anus, is surrounded 
by a powerful sphincter. 
The muscular integument of the intestine, excepting 
on the rectum, is exceedingly thin, and the muscular fibres 
in both layers lie far apart; on the rectum, they are thick 
and contiguous. 
The: inner surface of the intestine is invested with 
epithelium similar to the layer on the æsophagus, saving that 
the cylindric cells are more dispersed; but here, too, many 
of them contained the above-mentioned granulated substance. 
The intestine was quite full of fecal boli, elliptic in 
form, and so thick in the middle that one bolus sufficed 
to fill out the intestine, figs. 3;,7. 
