cxxvn. NOT'^S KT HKVl'K 



shcw snl.s(M|iiciill> I coiisi.l.T association, whctiiei- tcmporary (?) 



or. as in llic K'"<''"'l inajorily of cases, pcniiancnl and liien leadinj? 



I |ii,-alion in llir tni.' snisc. lo lie ncccssary in Grc^arines for 



siicccssliil spoiiilalioii i. V. l'or I lie rorinalion of ganu'lcs. Tliis is 

 corn'lat<".l willi Uic (secondary) absence of diflerentiation in 

 th.' sexnal rl.-iiicnls ol' a \ivi-.\\ iiiany, especially monocystid, 

 lornis; —in oLiier words, willi llie réduction froiii anisogauiy to 

 disoganiy. Tlie latler, llierefore, is lo l>e re}<arded as tlie more iiwdi- 

 fu'iL nol llie more primitive, condition in lliis order. 



Altiionj^li it is in studying nuclear multiplication and sporula- 

 tion that Ihe diflicully of securing material at any time lias heen 

 particidarlx fell, yet 1 hâve obtained sufficient stages to shew that 

 C. irret/iihiris présents several points of interest in this respect. 

 The earlier nuclear divisions, so far as I hâve seen, are completely 

 amilotic, the laterones, on the other hand, beingmitotic, with large 

 and apparent centrospheres. Isolated centrospheres scattered about 

 the cyto|)lasm are by no means unfre(|uent. A certain number of 

 large nuclei remain over unused, taking no part in sporoblast- 

 formation. Theprimary sporoblasts or gamètes are completely iso- 

 gamous, and the conjugation phenomena strikingly recall tliose 

 of Moiiociislis as described by Ciénot*. 



Spore andsporozoïte-formation follow the usual plan. The spore- 

 iiiemltrane is without any valves, but there is a deeply staining 

 ]dug or cap closing the mouth of the inner spore-membrane 

 — the endospore — at the funnel end, which is doubtless dissolved 

 by the digestive juices of the fresh hosl, thus allowing the sporo- 

 zoïtes to pass ont. 



' CCÉNOT, L. — Arc/i. (le Biol. 17, 1901, p. 589. 



