6 Unircrsity of California Publications in Zoology [Vol.20 



thi'ee to five turns, and a giant individual, presumably preceding 

 multiple fission (pi. 2, fig. 13), has eight turns. Normal vegetative 

 individuals (pi. 1, figs. 1, 6, 8) have one to two turns only. 



The grooves between the ridges mark the location of ectoplasmic 

 lines of deeplj' staining material, possibly myonemes, or extensions 



st.gr. 



Fig. A. Semidiagrammatic figure of Streblomastii strix gen. iiov., sp. uov. 

 Black granules in cytoplasm show particles stained intra litam with neutral red. 



Abbreviations: 6/., blepharoplast; cent., centrosome; fl., fiagella; my., myo- 

 nemes; n., nucleus; rh., rhizoplast; st.gr., stained granules. X 2000. 



of the neuromotor system. They are feebly stained, if at all, in 

 binary and multiple fission (pi. 2, figs. 14, 17, 19) and are sometimes 

 marked by accumulations of minute granules staining black with 

 haematoxyliu. They terminate anteriorly at or near the blepharoplast 

 and fade out posteriorly. 



