292 . ©. CLIFFORD DOBELL. 
(Grassi and Foa, ’04), chromidia are described in the ordinary 
vegetative animal, but no particulars of their origin or 
function have been given. Perhaps they are really food 
bodies. Calkins (98) has described the nucleus of Tetra- 
mitus as having its chromatin scattered through the ecyto- 
plasm during resting stages. his has never been confirmed, 
and I think it quite possible that the “chromidia” are here 
also merely ingested food masses, which often stain very 
strongly in such flagellates. 
Awerinzew (’07) says that a part of the chromatin—in the 
TEXT-FIG. 9, 
Opalina: part of an individual which is preparing to form 
gametes. N. primary nucleus, which has given up most of 
its chromatin as chromidia (ch.). The latter, by aggregation 
at various points, give rise to the secondary nuclei (n.). 
(Modified from Neresheimer, 07.) 
resting animal—is in the form of chromidia in Chilomonas. 
Prowazek (’07a) contests this, and believes Awerinzew’s 
specimens were badly fixed. He himself (03) found no 
chromidia in this animal. 
Quite recently Swellengrebel (08) has found granules of 
“volutine” (A. Meyer) in Trypanosoma. He says: “It is 
evident these granules of volutine, from their nuclear origin, 
ought to be considered as chromidia.’ With this I cannot 
agree. ‘They are not chromatin, therefore to my mind they 
are not chromidia. 
On the whole the chromidia of flagellates are at present of 
