' Basaldel, Fig. 
7 forskjelligt formet Cylinderepithel. 
hovedet gaar over i Spiseroret, 
 Flade en stærk Indsnøring, Fig. OE 
«Svælghovedets bagerste Del med en lidt bredere Basis, 
I vor Beskrivelse over Priapuloides typicus (*Fauna 
littoralis. Norvegiæ”) omtalte vi, at der i Mundhulbeden 
var 8 Rækker Tænder; dette maa vi nu berigtige. 
Hele Mundhulheden er besat red Mender, Hig. 92) ¢, 
der staa 1 ringformige Rækker i hele den forreste Del, imedens 
Rækkerne i den bagerste Del antage en mere skraa Retning. 
I den første Række er der 5 store Tænder, som staa 
temmelig langt fra hverandre; men imellem hver 2 af disse 
findes paa fuldt udvoxede Individer to mindre Tænder, der 
paa det af os'i “Fauna littoralis Norvegiæ” beskrevne 
Exemplar ikke vare fremkomne. 
Bagenfor den 10de Række blive Tænderne saa smaa, 
at de ikke kunne sees med blotte Øine, og jo 
nærme sig Indgangen til Spiserøret, jo mindre blive de, 
ligesom. de antage en simplere Form. Disse Pænder, Fig. 
6, 7, ere pyramideformede, have en bred, næsten firkantet 
6, a, 
noget bøiet Spids, Fig. 6, b, 7, der vender indad og lidt 
nedad mod Mundhulheden. Den Del af Tænderne, der 
vender imod Hulhedens Veg, er næsten flad. Disse Tæn- 
der udgjore altsaa den tredie Form, der af os tidligere var 
overseet. 
beklædte med et lidt 
I de store Tænder, der 
indtage Mundhulens forreste Del, Fig. 8, bestaar Epithelet 
af Cylinderceller, som have en lidt langstrakt Form; men 
i de smaa enkle Tænder, som vi ovenfor have beskrevet, 
ere Cylindercellerne overmaade lange,- Fig. 7, a, og ligne 
meget cé Celler, der udgjør Epithelbekledningen paa Tar- 
mens Tverfolder, Fig. 10, og som senere skulle omtales. 
Samtlige Tænder ere hule og 
Ligesom 'Pænderne egentlig ere Fortsættelser og Om- 
dannelser af det almindelige Uhitinovertræk, saaledes er 
deres indre Bpithelialbeklædning en Fortsættelse af Hudens 
eller Tarmens Hpitheliallag. Selve Tandspidsen er aldrig 
hul: men altid kompakt og fast, Fig. 7, 0. 
Svelghovedet, Fig. 9, har paa den 'ydre aflange Flade 
en hel Del Muskler, der ligge i 2 Lag. © 
Det ydre Lag bestaar af 8 temmelig brede, '8—107m 
lange Muskler, Fig. 9, a, som tage deres Udspring paa 
og 
som fæste sig indenfor Retrac- 
torerne. 
ee Yes indre Lag er sammensat af flere, “men noget 
smalere Muskler, Fig..9, b, der have samme Udspring og 
Fæstepunkt som. det ydre Lags Muskler. Disse Muskler 
omkring Mundaabningen, 
«tjene sikkerlig til at presse Mundhulheden sammen og for- 
korte den. Bagentor disse Musklers Udspring, hvor Svælg- 
har. dette paa dets ydre 
n Mængde Muskler, 
ve Svælgmuskler; men forene sig noget bagtil til 
en næsten tendinøs Membran Fig. 9, e, som insererer sig 
paa en Völd, der. omgiver Spiserørets ydre Flade, Fig. 9, f. 
mere de. 
ere lidt krumbøiede og lobe ud i en 
c; denne er omgivet af 
der fæste sig strax bagenfor de nys- 
In our deseription ot Priapuloides typicus (*Fauna 
littoralis Norvegiæ"), the cavity of the mouth is stated to 
have 8 rows of. teeth. This was an error, which we must 
now rectity. 
The whole cavity of the mouth is dentiferous, 
Anteriorly, the teeth are disposed in annular series: poste- 
; 
< 
WR, A, Op 
riorly, in series somewhat oblique. 
The first row consists of 5° large teeth, rather far 
apart; but in .the space between, full-grown individuals 
have ‘two smaller ones, 8 in all, which had not developed 
in the specimen described in “Fauna littoralis Norvegiæ.” 
Posterior to the 10th series, the teeth are so minute 
as.to be invisible to-the naked eye, and the nearer they 
approach the entrance to the cesophagus, the more minute 
do they become, assuming at the Same time a simpler form. 
These teeth, figs. 6; 
almost quadrangular base, tig. 6, a, somewhat arcuate and 
slightly. bent at the point, figs. 6,0: 7, which is turned m- 
and a little downwards, towards the cavity of the 
The part of the teeth that faces the wall of the 
These teeth constitute accordingly 
7, are pyramidie, having a broad and 
wards, 
mouth. 
cavity is very nearly flat. 
the third form, overlooked in our previous description. ’ 
The teeth are all hollow, and invested. with: cylindric 
epithelium, in ‘form. On the large teeth, 
pying the anterior portion of the cavity of thé mouth, fig. 8, 
varying occu- 
the epithelium consists of cylindric cells, somewhat elongate 
but on the mmute, simple teeth, described above, ° 
a, and bear 
considerable resemblance to the cells of the epithelial in- , 
10, 
in form; 
the cylindric cells are exceedingly large, fig. 7, 
tegument on the transverse folds of the intestine, 
to be described in due course. 
Precisely as the teeth, in a strict sense, are transformed 
continuations of the common chitinous integument, so. too is 
the inner epithelial tunic simply a continuation of the skin, or 
of the epithelial layer of the intestine. The points of the 
teeth are never hollow, but invariably firm and compact, 
me, Up (Ds 
The gullet, fig. 9, 
surface with numerous muscles, 
is furnished on its exterior oblong 
arranged in 2 layers. 
The outer layer consists of 8; “comparatively broad 
muscles, 8—10”” in length, fig. 9,:a, which 
origin on the gullet, with a somewhat broader 
are | attached round the buccal aperture, 
have: their 
and 
the. 
base, 
underneath 
-retractors. 
The inner layer is built up of several muscles, ai 
trifle narrower, fig. 9, b, having the same point of origin 
and attachment as those of the outer layer. These muscles 
must assuredly serve to close up and shorten the cavity 
of the mouth. Posterior to the origin of these muscles, 
where the -gullet opens into the cesophagus, is seen, on 
the outer surface of the latter, a deep instriction, fig. 
9, c, surrounded by numbers of muscles, which are attached 
immediately posterior to the pharyngeal muscles just de- 
4 . . . . 2 J x . 
scribed; they unite however a little farther back, forming 
an almost tendinous membrane, fig. 9, e, which is mserted 
