548 ' ZOOLOGY: KOFOID AND CHRISTIANSEN 
isms, to offer confirmatory evidence for the presence of several species 
instead of one only in the genus, to add to the skepticism regarding 
autogamy and the existence of an Octomitus stage in the Hfe-history, 
advanced by Hartmann (1911), and to offer some inconclusive evidence 
of maturation in the so-called conjugation cysts. The paper will be 
published in full in the University of Cahfornia PubHcations in Zoology. 
Fig. 1. Ventral view of Giardia microti sp. nov. in early prophase of mitosis, somewhat 
diagrammatic. X 3400. Abbreviations: ant. chiasma, anterior chiasma; ant. lat. fl., an- 
terior lateral flagellum; ant. perist., anterior peristome; ax., axostyle; cary., karyosome; cent., 
centrosome; cyt., cytostome; fr. vent, fl., free ventral flagellum; intracyt. lat. fl.. intracyto- 
plasmic part of the antero-lateral flagellum; intracyt. post. lat. fl., intra-cytoplasmic part 
of the postero-lateral flagellum; intranuc. rhiz., intranuclear rhizoplast; lat. bas. gr., lateral 
basal granule of antero-lateral flagellum; /. bleph., left blepharoplast; nuc, nucleus; par. 
b., parabasal body; post. bas. gr., posterior basal granule of posterior flagella; post, fl., 
posterior flagella; post. lat. fl., posterolateral flagellum; post, perist., posterior peristome; 
rhiz., rhizoplast joining nucleus to blepharoplast; tri. halo: triangular halo about posterior 
part of the axostyle. 
Giardia microti sp. nov. (fig. 1) in common with the other species, is a 
diplozoic flagellate, a binucleate somatella with eight flagella in four 
pairs, antero-lateral, postero-lateral, free ventral, and posterior, the last 
emerging from the posterior tip of the axially located axostyle, the 
ventrals from the ventral surface, and the others from the lateral mar- 
..lat. bas. gr. 
^intracyt. post. lat. fl 
..ant. lat. fl. 
