Hverken i Mundskiven eller Tentaklernes Hud findes 
Kalk. å 
Fordøielsesorganerne. 
"Tarmen danner de sædvanlige to Bøininger og gaar 
da med en temmelig lige Rectum over i Kloaken, Fig: 15, c. 
Denne er langstrakt oval, og fra dens forreste Del udgaar 
paa hver Side af Recto et Tarmappendix (Respirations- 
mik), 1948, Wey, tv 28, Det venstre, Fig. 15, e, 23, har en 
temmelig. kort, næsten nøgen Stamme, fra hvis forreste Ende 
udgaar en kort Gren, der deler sig 1 utallige større og 
mindre Blærer, som antage Formen af en Drueklase. Det 
høire Appendix, Fig. 15, f, 23, er meget langt; fæster sig 
paa 3 af Kalkringens Radialprocesser og er paa hele Læng- 
den forsynet med storre og mindre Blærer, der dels sidde 
enkeltvis, dels i mindre Grupper med anes Mellemrum, 
Forøyrigt er Tarmen i histologisk-anatomisk Henseende 
ganske overensstemmende med den, der af os er beskreven 
hos Troch. Thomsonii: 
Det indre Skelet. 
Kalkringen, Fig. 27, bestaar af 10 Stykker, 5 Radial- 
stykker og 5 Intefradialstykker, hvilke hos unge Dyr ere 
bundne sammen med Bindevæv, saa de kunne skilles fra 
hverandre, imedens de hos ældre Dyr ere fuldstændig sam- 
menyoxede: Sømmene ere ganske forkalkede, saa de enkelte . 
Stykker dike kunne skilles fra hverandre, 
Kniven eller kaustisk Kali.’ 
Radialstykkerne, Fig. 27, a, ere 47” lange og 2”m 
brede; 'paa Legemets udvendige Flade to fremragende 
Kamme, Fig. 27, b, b, der paa den bagerste Trediedel' ud- 
vider sig i Bredden, saa at her fremkommer en Knude, 
bagenfor hvilken Kammen bliver smalere. Den ene af 
Kammene har paa den forreste Del en Fordybning, der 
tjener til Fæstepunkt for Radialmuskelen, Fig. 27, c; imel- 
lem begge Kammene er en temmelig dyb Fure, Fig. 27, d, 
der optager en Ampulle. Fortil ende disse Kamme i to 
Fremstaaenheder, hvoraf den ene er lidt kortere, bredere 
og mere afrundet, end den anden, og imellem hvilke findes 
et alka Indsnit, Fig. 27, e. 
hverken med 
Ethvert Radialstykke har en bagerste, forlænget Del 
(Processus), som paa sin yderste Ende er spaltet, Fig. 27, 
J og til hvis indre Flade Radialkarret er føæstet. De 4 
af disse Processer ere omtrent lige lange, indtil 2””: men 
den dte, den nemlig, som svarer til Bugens midterste Ra- 
dialkar, er meget kortere, omtr. 1””, Alle disse Proces- 
ser vende med deres spaltede Spidser saa stærkt indad 
Neither the oral disk nor the tentacles exhibit any 
trace of calcareous deposit. 
Digestive Organs. 
The intestine has 2 convolutions, and passes, with a com- 
paratively straight rectum, into the cloacum, fig. 15, c. The 
latter organ is elongato-ovate in form; and from its anterior part 
protends on either side of the rectum an intestinal appen- 
dage (respiratory tube), figs. 15, d; 23. The left appen- 
dage, figs. 15, e; 23, has a comparatively short and almost 
naked stem, from the anterior extremity of which proceeds 
a short branch, dividing into countless: vesicles, 
in size, 
varying 
which present the appearance of a cluster of 
The right appendix, figs. 15; f; 23, is ‘exceedingly 
long; it is webbed to three of the radial processes of 
the calcareous ring, and furnished throughout its entire 
length with vesicles, varying in size, somé of which are 
isolated and some arranged in small groups with considerable 
interspace. 
For the rest, the histological structure of the intestine 
differs im no wise from that distinguishing the organ in 
Troch. Thomsonii. 
grapes. 
Caleareous Skeleton. 
The calcareous ring, fig. consists of 10 segments, 
5 radial and 5 interradial, which, in immature examples, 
are webbed together by connective tissue, and thus admit 
of being parted, whereas ‘in full-grown individuals they 
are connate; the sutures are wholly calcined, and some of 
the segments cannot be separated, either with a knife or 
when treated with a solution of caustic potash. 
The radial segments, fig. 27, a, are 4” long and 2” 
broad; on the outer surface of the body are seen two pro- 
jecting combs, fig. 27, b, b, which expand at their posterior 
third, and here accordingly there is a protuberance, poste- 
rior to which the comb becomes narrower. One of the 
combs has on its anterior part a depression, which serves 
as a point of attachment for the radial muscle, fig. 27, 
c; and between the two combs there is a rather deep 
groove, fig. 27, d, for the reception of an ampulla. An- 
teriorly, these combs terminate in two protuberances, one of 
«which is somewhat shorter, broader, and more rounded than 
the other. and between which is seen a semicircular inci- 
‘sion, fig. 27,.e 
Each radial segment has a posterior elongate part, 
or process, cleft at the extremity, fig. 27, f, and to 
the inner surface of which the radial esel is webbed. 
Four of these processes are about equal in length ( (Ban: 
but the fifth — that corresponding to the medial radial 
vessel of the belly — is much shorter, about 17”, All 
of the processes incline with their cleft extremities so 
