men som senere har faaet en fuldstændigere Løsning 1 Vej- 
dovsky’s! og Spengel’s? Afhandlinger over Ægdannelsen og 
Hannen hos Bonellia viridis, og hvortil vi skulle tillade os 
at henvise for ikke at gjøre os skyldig i Gjentagelser. 
Længere bag vare Follikelgrupperne talrigere, Æggene mere 
udviklede, Fig. 16, p; +i enhver Follikel var et Æg, der 
udviklede sig af en Centralcelle. Jo længere bag man kom, 
desto mere ere Æggene udviklede, saa at henimod Ægge- 
stokkens bagerste Ende findes de mest udviklede Æg, der 
ved sin Væxt sprænger Follikelen og falder ud i Krops- 
hulheden, hvor det fuldender sin Udvikling. 
Æggestokken hos Hamingia lignede en Samling Drue- 
klaser ophængte 1 et Baand. 
Det fuldmodne Æg saaledes som det findes 1 Ægge- 
beholderne og tildels i Kropshulheden har kun en Hinde, 
som Lacaze-Duthiers og for ganske nylig Dr. Spengel har 
paavist hos Bonellia viridis; den af Schmarda beskrevne 
anden Hinde eller Membran, hvormed Ægget skulde være 
omgivet, er utvivlsomt Follikelmembranen. 
Indenfor Blommemembranen ligger Kimblæren med 
Kimplet omgiven af Protoplasmakorn, og udenom «disse 
store Blommekorn, dentoplasmatiske Kugler (se Vejdovsky). 
Ingen Hanner have vi fundet, uagtet vi vare meget 
opmærksomme derpaa. 
De ovenfor beskrevne Kjønsorganer afvige forsaavidt 
fra Bonelliens, som der hos denne kun er en Uterus, ime- 
dens Hamingia har to. Men derimod nærmer den sig just 
derved til Slegten Thalassema. Omendskjondt dennes Ana- 
tomi, saavidt vi vide, ikke er tilstrækkelig bekjendt, frem- 
gaar dog af de Undersøgelser Max Miiller® har anstillet 
over Thalassema gigas, at den har 2 Uteri, som Miller 
rigtignok kalder Ovarier. Han angiver, at de findes paa 
Bugfladen, ere langstrakte, indtil 2 Tommer lange og have 
en kort Udførselsgang, der munder ud i to paa den ydre 
Bugflade siddende yderst smaa Vorter. Paa disse Ovarier 
har Miller iagttaget en lille Fremstaaenhed, hvorpaa han 
tror at have seet en lille Aabning. 
Diesing* har imidlertid opfattet Forholdet rigtigere, 
idet han benævyner dem Uteri, uden at han dog omtaler 
1 Ueber die Fibildung und die Mannchen von Bonellia viridis. 
Franz Vejdovsky. Zeitschrift f. wissensch. Zoologie, 30 B. 1878, 
pag. 487. i 
> Dr. J. W. Spengel. Beitråge zur Kenntniss der Gephyreen. 
Die Bibildung, die Entwicklung u. das Minnchen der Bonellia. Mit- 
theilungen aus der zoologischen Station zu Neapel. 1B., 3 Heft, 1879. 
> Thalassema gigas, Max Miiller. Observ. anat. de vermibus quibus- 
dam maritimis. 1852, pag. 20. 
+ Revision der Rhyngodeen, Karl Diesing, 1859, pag. 772. 
Lacaze-Duthiers, but which, on a subsequent occasion, was 
made the subject of more exhaustive treatment in Memoirs 
by Vejdovsky* and by Spengel? on the growth of the egg, 
and the structure and economy of the males, in Bonellia 
viridis; and to these papers we ‘beg leave to refer, with 
the object of avoiding needless repetition. Farther back, 
the follicular groups are more numerous, the ova in a 
relatively advanced stage of development, fig. 16, p. In 
every follicle was an egg, developing from a central cell. 
The maturity of the ova progressing with their passage 
down the ovarium, the posterior extremity contains of 
course the most developed, which, after bursting the fol-, 
licle, drop through into the perivisceral cavity, and there 
attain the final stage of development. 
The ovary in Hamingia resembled bunches of grapes 
attached to a piece of ribbon. * 
The fully mature egg, as found in the uteri, — and - 
(some) in the perivisceral cavity, — is enveloped in a 
pellicle only, which Lacaze-Duthiers, and quite recently Dr. 
Spengel, have shown to be also the case with Bonellia vir» 
idis; the second ‘pellicle, or membranaceous envelope, de- 
scribed by Schmarda as investing the egg, is unquestionably 
the membrane of the follicle. 
Underneath the membrane’ of the yolk, lies the germ- 
inal vesicle, with the germinal speck, surrounded by proto- 
plasmatic granula, and without these granula large yolk- 
globules, dentoplasmatic pellets (vide Vejdovsky). 
No males were met with, though carefully looked 
for. 
The generative organs described above differ, we see, 
from those of Bonellia, inasmuch as the latter has but one 
uterine pouch, whereas Hamingia is furnished with two 
uteri. But in thus differing from one congener, the new 
genus approximates another — Thalassema. True, the 
anatomy of this genus is as yet imperfectly known; but 
it nevertheless appears from Max Miller's* investigation 
of Thalassema gigas, that the animal has two uterine re* 
ceptacles, which Miller, however, terms ovaries. , These 
organs, placed, he states, on the ventral surface, and elong- 
ate in form, measuring as much as 2 inches in length, are 
each furnished with a short eferent duct, that disembogues 
through 2 minute, wart-like papille on the outer ventral. 
surface. On these “oyaries’ Miller has observed a small 
prominence, in which he believes to have detected a minute 
opening. 
Diesing,* however, had a clearer apprehension of the 
office performed by these organs, and terms them accord- 
+ Ueber die Hibildung und die Mannchen von Bonellia viridis. 
Franz Vejdovsky. Zeitschrift f. wissensch. Zoologie, 30 B. 1878, 
pag. 487. 
2 Dr. J. W. Spengel.  Beitriige zur Kenntniss der Gephyreen. 
Die Eibildung; die Entwicklung u. das Mannchen der Bonellia. Mit- 
theilungen aus der zoologischen Station zu Neapel. 1B., 3 Heft, 1879. 
3 Thalassema gigas, Max Miiller. Observ. anat. de vermibus quibus- 
dam maritimis. 1852, pag. 20. 
4. Revision der Rhyngodeen, Karl Diesing, 1859, pag. 772. » 
