Zoologischer Anzeiger 



herausgegeben 



von Prof. J. Victor CarUS in Leipzig. 

 Zugleich 



Organ der Deutschen Zoologischen Gesellschaft. 



Verlag von Wilhelm Engelmann in Leipzig. 



XIX. Band. 18. Mai 1896. No. 503. 



Inhalt: I. Wissenschaftliche Slittheilnugen. 1. Masterman, Ou some Points in tlie General 

 Morphology of the Met:izoa etc. (Schluß.) 2. v. Seidlitz, »Regni Animalis Appeadis«. Eine in Ver- 

 gessenheit gerathene Schrift Linné's. 3. Cams, Die Litteratur-Übersicht im Zoologischen Anzeiger. 

 II. Slittheil. aus Museen, Instituten etc. 1. Deutsche Zoologische Gesellscliaft. III. Personal- 

 Notizen. Vacat. Bibliographia.p.253— 268. 



I. Wissenschaftliche Mittheilungen. 



1. On some Points in the General Morphology of the Metazoa considered 

 in connection with the physiological processes of Alimentation and 



Excretion. 



By Arthur T. Masterman , B.A. Lecturer and Assistent Prof, of Natural History 



in the University of St. Andrews. 



(Schluß.) 



We are now in a position to return to the Arthropoda, and other 



Coelomata, and to give a physiological interpretation to the peculiar 



history and fate of the coelom in these groups ^o. The root of the 



whole matter, as already said, is the elaboration of polycytic digestive 



processes, which again is due to the fact that the organism impresses 



into its services the products of the excretory activity of the endo- 



dermal cells. Thus the successive steps in the elaboration of polycytic 



digestion, and its results may be tabulated thus: 



1) Utilisation of liquid excretory products of endoderm cells (F'or- 

 mation of secretory glands). 



2) Absorption of the liquid nutritive fluid so obtained through 

 the endoderm into blood system. 



3) llise of blood system, as predominantly nutritive in function. 

 (Differentiation of whole blood system and of respiratory carriers, i. e. 

 red corpuscles.) 



4) Loss of nutritive function of coelomic fluid, consequent upon 

 reduction of monocytic digestive processes. (Reduction in size and 

 morphological importance of coelom, and of nephrostomes.) 



60 A. Sedgwick, loo. cit. — E. R. Lankester, loc. cit. 



14 



