368 si'MMAKY OF CURRENT RESEARCHES RELATING TO 



infecting agent. In the case of Euphorbia pilulifera, fresh experiments 



by Lafont* lead him to regard the Hemipteron Nysius eaphorbise as the 

 transmitting agent. 



Trypanosome and Leptomonad in Drosophila.f — E. Chatton and 

 A. Leger give reasons for regarding as specifically distinct two related 

 parasites known to occur in the Muscid Drosophila confusa, viz. a 

 Trypanosome (of the T. dimorphon type), in the Malpighian tubes, and 

 an aciculate Leptomonas (L. drosophilse) in the intestine. 



Structure of Euplotes.J — L. E. Griffin has given a well worked out 

 and beautifully illustrated account of the structure of Euplotes worcesteri 

 sp. n., which was found in some water taken from Manila Bay. The 

 broad, considerably excavated peristome, extending two-thirds the length 

 of the body, contains 45 to 70 wide membranelhc ; the mouth is irregu- 

 larly oval and large ; the pharynx is long, recurved, containing 20 to 30 

 mernbranellae, several oblique rows of endoral cilia, and a group of 

 suboral rnembranellse ; there are 7 frontal cirri, 3 abdominal cirri, 5 

 anal cirri, 2 left marginal cirri, to 3 right marginal or caudal cirri ; the 

 sensory bristles on the dorsal surface are usually in eight longitudinal 

 rows ; on the ventral surface there are paroral, exoral, and lateral rows of 

 sensory bristles, and two to four bristles at the base of each cirrus ; the 

 meganucleus is long and horseshoe-shaped, with a fluke-like enlargement 

 at the posterior end, and a considerable thickening where it bends across 

 the anterior part of the cell ; the single micronucleus lies in a slight 

 depression of the meganucleus, on the left side near the anterior end of 

 the body. 



Division of Euplotes worcesteri. § — L. E. Griffin describes the pro- 

 cess of division in this Infusorian, and emphasizes the fact that " many 

 of the Protozoa are not simple but extremely complex animals." The 

 process includes two stages, one of preparation, the other of actual 

 division of the body and meganucleus. During each stage a definite 

 series of changes occurs in nearly every organ. 



The stage of preparation for division includes the reconstruction and 

 concentration of the meganucleus, the invagination of the rudiment of 

 the new peristome, the division of the micronucleus, and the appearance 

 of the new cirri. 



That of division includes the constriction of the body and separation 

 of its halves, the drawing of the new peristome to the surface of the 

 body and into its final shape and position, completion of the new pharynx, 

 division of the meganucleus, absorption of the old cirri, and the shifting 

 of the new cirri from the places of their origins to their ultimate positions. 



Species of Leucocytozoon.|| — C. Mathis and M. Leger describe what 

 appear to be three new species of this genus from the blood of the wild 

 peacock, of Ardetta sinensis and of Munia topela. 



* C.R Soc. Biol. Paris, lxx. (1911) pp. 58-9. 



t Tom. oit., pp. 34-6 (1 fig ). 



t Philippine Journ. Sci., v. (1909) pp. 291-312 (3 pis. and 13 figs.). 



§ Tom. oit., pp. 315-36 (4 pis.). 



|| C.R. Soc. Biol. Paris, lxx. (1911) pp. 211-12. 



