ZOOLOGY AND BOTAXY, MICROSCOPY, ETC. 



363 



New Species of Trichonympha. — Charles Atwood Kofoid and 

 Olive Swezy {Univ. CaUfornia PuhUcations in Zoology, 1919, 20, 

 41-98, 6 pis., 4 figs.). A description of T. campanula sp. n., which has 

 a highly specialized flagellate type of structure and a highly developed 

 neuromotor system. The centroblepharoplast is connected by a complex 



Nuclear mitosis in Trichonympha campanula. 



One half the number of chromosomes is shown. 1-7 prophase. 



1. Vegetative phase of chromatin-encrusted network. 2. Splitting of 

 the chromosomes. 3. Separation of chromosomes resulting from 

 splitting ; paired arrangement noticeable. 4. Paradesmose formed 

 between daughter centroblepharoplasts. 5. Formation of loops ; 

 nucleus approaching elongated paradesmose. 6. Tangled stage in 

 which the pseudo-synapsis occurs. 7. Number of chromosomes 

 reduced one half. 8. Metaphase ; looped chromosomes unfolding on 

 the spindle. 9. Late anaphase ; paradepmose still connecting centro- 

 blepharoplasts. Chromosome marked A is splitting in fig. 2, appears 

 as two chromosomes in 3 to 5, is re-united in 7 and 8, and separated 

 into two distinct chromosomes in 9. The small coiled chromosome 

 is the heterochromosome. 



system of oblique fibres with the numerous flagella which cover two- 

 thirds of the surface of the body. Besides these fibres the ectoplasm 

 contains an alveolar layer and one of transverse myonemes. Immediately 

 below it in the endoplasm are the longitudinal myonemes. The nucleus 



