;o2 



MONTGOMERY. 



[Vol. XV. 



A Single 



Nucleolus. 



More than One Nu- 

 cleolus, All Alike. 



Nucleolus and 

 Paranucleolus. 



Annelida. 



' Nereis 

 Spinther 

 Ophryotrocha 

 Sternaspis 

 Polydora 

 Spio 



Capitellids 

 Polygordius 



iOligochacta 

 Rhynchelmis 

 Lumbricus 

 ' Nephelis 

 Branchiobdella 

 Haemopis 

 Piscicola 

 Clepsine 

 Piscicola 



(Korschelt) 

 (V'ejdovsky) 



*1 



)■ (Vejdovsky) 



* J 



* (Leydig) 



*1 



\ (Ludwig) 



* (mihi) 



* (Whitman) 



* (Leydig) 



* (E. B. WUson) 



* (mihi) 



* (Giard) 



* (Eisig) 



* (Fraipont) 



* (Clapar^de) 



* (O. Hertwig) 



Arthropoda. 



