270 



Tlie Unittj of the Organism 



of the sixteen-millimctcr-long Porospora gigantea described 

 by E. van Beneden and discussed and figured by Biitschli 

 shows us an ontogeny or individual development in one case 

 no less positive, and probably little less complex were all 



cp'm. 



r TU* 



n. 



cl.m. 



FIGURE 10. CORYCELLA ARMATA (fROM WASIELEWSKI, AFTER LEGER). 



ep'm., epimerite. pr'iii., protomeritc. d.m., deutomerite. n., nucleus. 



the details known, than that of many endoparasitic worms.* 



But how could a zoologist hesitate to recognize that so 



elaborate an organism, as for example a Cort/ceUa, figure 



* With reference to tlie develoj)ment of tliis species, it should he 

 remarked that althou<»h hiter researches have proved that the amoohoid 

 stages considered hy van Beneden to belong to this series in reality have 

 nothing to do witli this animal, yet the later stages leading up to the 

 (inal one, or "trophozoite" seem not to have been questioned; and these 

 constitute the evidence af an oiitoyeny with which we are now specially 

 concerned. 



