310 C. CLIFFORD DOBKELL. 
and Popoff (07) have greatly extended the original 
chromidial hypothesis. For them, the ‘ sphere” of 
Noctiluca (Ischikawa, Calkins, Doflein), and the “spongy 
TExtT-FIG. 20. 
7 
A. Formation of ‘‘chromidia ” (Ch.) in the oocyte of Paludina 
vivipara. (After Popoff, °07.) 
B. Formation of the “spongy centrosome” (S.C.) from the 
nucleus in Actinospherium. (After R. Hertwig, 98.) 
centrosome” of Actinospherium (Hertwig, ’98), corre- 
spond to the “ chromidia” of Paludina (cf. p. 302), all bemg 
chromidial structures. Further, the nucleolo-centrosome of 
Trext-Frie. 21. 
Parameeba eilhardi. WN. nucleus; Nk. Nebenkérper. The 
latter stains deeply with chromatin stains, and functions as a 
cytocentre. According to Goldschmidt and Popoff it repre- 
sents a “chromidial apparatus.” According to Hartmann 
and Prowazek, a kinetonucleus. (After Schaudinn, °96.) 
Euglena (Keuten, 95) and the Nebenkern of Paramceba 
(Schaudinn, 796) are each regarded by them as constituting 
a “ chromidial apparatus ”’ (text-figs. 21, 25). 
