364 SUMMARY OF CURRENT RESEAECHES RELATING TO 



is submedian, and part of its chromatin is permanently separated as a 

 "heterochromosome" contained within a small vesicle. Nutrition is 

 holozoic. There is no cytostome. The posterior endoplasm is usually 

 filled with food particles, and is covered only by a thin pellicle, in 

 contrast to the thick ectoplasm elsewhere. The body rounds up at the 

 time of division and the centroblepharoplast divides, forming a para- 

 desmose, the entire ectoplasm splitting into two parts with it. These 

 act as the centrosome in the succeeding mitotic figures, the spindle fibres 

 arising from the ends of the paradesmose or the centroblepharoplasts. 

 Precocious splitting of the chromosome, previous to the prophase, forms 

 52 V-shaped threads. The type is indubitably one of the Flagellata 

 in the family Trichonymphidas, in the order Hypermastigina Grassi, 

 near Polymastigina. J. A. T. 



New Trichonymphid. — Charles Attwood Kofoid and Olive 

 SwEZY (Univ. California Publications in Zoology, 1919, 20, 99-116, 

 2 pis., 1 fig.). A description of Leidyovsis sphserica, from the intestine 

 of Termopsis angusticollis Walker, a Californian termite. This Tricho- 

 nymphid is characterized by the presence of a neuromotor system, 

 consisting of a highly developed centroblepharoplast, oblique fibres, 

 basal granules and related flagella restricted to a single anterior zone, a 

 diiferentiated ectoplasm on the anterior third of the body, surface ridges 

 from the crest of which spring the flagella, and an alveolar layer. The 



per. 



Diagrammatic figure of Leidyopsis, Ectoplasm drawn in 



sections. 



dlv.l,, alveolar layer ; bas.gr., basal granules ; centrobleph., centroble- 

 pharoplast ; eci., ectoplasm ; end., endoplasm ; /. 6., food bodies; fl., 

 flagella; long.my., longitudinal myonemes ; n., nucleus; obl.f., 

 oblique fibres; oper., operculum; per., periplast ; sw.rd^., surface 

 ridges. ^ 



nucleus is anterior in position, and is distinguished by the presence of a 

 heterochromosome contained within a small vesicle. Nutrition is 

 holozoic. Division is of the Trichonymphid type. The centroblepharo- 

 plast, with its connecting motor organellse and ectoplasmic structures, 



