290 
Dì L. SOÓS 
not resist the attack of the phagocytes which use their substance for 
his own purposes. 
At the beginning of this paper I made known the cases in which 
the egg-cells grow by incorporating foreign cells. The example of the 
Gastropods point to the necessity of our being very careful in our jud¬ 
gement of the mutual connection of two cells if they are in the relation 
of attacker and attacked, because it is not always easy to decide which 
part each of them plays. I am of the opinion that in the genital gland 
of the Coelenterates and Ascidians — besides the growth by incorpo¬ 
rating foreign cells — well defined phagocytic processes are carried out, 
which may be deduced from the figures of the authors. In some figures 
of Müller (14) for instance the phenomena of hypertrophic degene¬ 
ration are dearly determinable, therefore I differ from Müller inasmuch 
as I hold a great part of the cells visible in the interior of the cyto¬ 
plasm of the egg-cells for phagocytes, and not nutritive cells. That 
similar processes take place also in Ascidians, is proved by the re¬ 
searches of Metcalf (12), according to whom in the sound remaining 
genital glands of the animals undergoing the so called season degene¬ 
ration, great numbers of the degenerating egg-cells are to be found, 
which — according to him — in spite of their degeneration take up 
follicle, or testa cells. But according to all probability we have also in 
this case to do with a phagocytic process. All these, however, are only 
deductions based upon analogy, which can only be confirmed or refuted 
by newer investigations, but the ovogenesis of Coelenterates and Asci¬ 
dians is by all means worthy of being newly investigated for the pur¬ 
pose of clearing up the phagocytic and nutritive processes taking place 
in their genital glands. 
EXPLANATION OF PLATE VII. 
All figures were made with Abbe’s camera lucida. Enlargement: Figures 1 — 5 
objective no. 9 and ocular no. 2, figure 6 objective no. 7 a and ocular no. 4 (Reichert). 
Fig. 1. Helix arbustorum. Egg- cell, beneath it a blood lacune with amoebo- 
cytes. Bouin’s picric-formol, Benda’s natrium sulphalizarinate-toluidin blue. 
Fig. 2. Neritina danubialis. Egg-cells with phagocytes. Bouin’s picric-formol, 
Apathy’s haematein I. A. 
Fig. 3. Succinea putris. Egg-cell with spermatozoa and spermatids. Bouin’s 
picric-formol, Heidenhain’s iron-haematoxylin. 
Fig. 4. Helix arbustorum. Egg-cells with spermatocytes and spermatids acting 
as phagocytes. Bouin’s picric-formol, Heidenhain’s iron-haematoxylin. 
Fig. 5. Helix arbustorum. Egg-cell with spermatocytes and amoebocytes acting 
as phagocytes. Bouin’s picric-formol, Heidenhain’s iron-haematoxylin. 
Fig. 6 . Planorbis corneus. Sound egg-cell. Bouin’s picric-formol, Apáthy’s 
haematein I. A. 
