No. 2.] COMPARATIVE CYTOLOGICAL STUDIES. 



501 



A Single 

 Nucleolus. 



More than One Nu- 

 cleolus, All Alike. 



Nucleolus and 

 Paranucleolus. 



Esperella 



Spongilla 



Tedamione 



Hircinia 



Hyd7-ozoa 



Aequorea 



Hydractinia 



Podocoryne 



Geryonia 



Tubularia 



Eucope 



Aeginopsis 



Hydra 



r Nausithoe 



\ Pelagia 



f Physophora 



\ Rodalia 

 Ctenophora 



CoeUitterata. 



\ * (H. V. Wilson) 

 * (Fiedler) 



* (Weismann) 



* (Hacker) 



^ \ (Bunting) 



« (Fol) 

 *■ (Doflein) 



* (Chun) 



(H.V.Wilson) 



* (O. Hertwig) 



* (O. Hertwig) 



* (Brauer) 



* j. (O. Hertwig) 



« 



* (mihi) 



Bothriocephalus 

 Distomum 



' Polycladidea 

 Tricladidea 

 Rhabdocoele 

 Prorhynchus 

 Bothrioplana 



_ Haplodiscus 



Plathelmiitthes. 



'• * (Schauinsland) 



* (Schauinsland) 



* (Lang) 



* (Repiachoff) 



^ > (Vejdovsky) 



* (Bohmig) 



* (Jijima) 



A^eviertini. 



