THE PHILIPPINE 



Journal of Science 



D. Ethnology, Anthropology, and 

 General Biology 



YoL. V ISTOVEMBEE, 1910 No. 5 



EUPLOTES WORCESTERI SP. NOV.: I. STRUCTURE/ 



By LA^YKEXCE Edmonds Griffin.^ 



This Euplotes was discovered in Feln-uary, 1909, in some water from 

 Manila Bay which was brought to the laboratory with the eggs of an 

 Aplysiid. As the eggs decayed an infusion was produced in wliicli the 

 Euplotes multiplied freely. My attention was directed to this form by 

 observing the process of division in a li\ing individual and noting that 

 the new peristome appeared to lie, not on the outer surface lateral or 

 posterior to the old one, but inside the body, dorsal to the old peristome, 

 remaining thus until the two halves of the body drew apart. This ob- 

 servation was so at variance with the processes of division occurring in 

 the Protozoa with which I was then acquainted, that I made considerable 

 effort to verify it. Further study disclosed numerous other features so 

 interesting that it seemed desiralile to make a complete study of the 

 structure, division, and conjugation of the species. When this Euplotes 

 was discovered there were at least three other species of hypotrichous 

 infusoria in the culture, several species of other ciliates, together with 

 flagellates and amcEba?. The Euplotes multiplied with far greater 

 freedom than any of the other protozoa. ' From time to time since then, 

 the growth of the Euplotes has been stimulated by dropping into the jar 

 small pieces of thoroughly cooked iish or Areas. The cooking was 

 simply to avoid the possibility of adding fresh protozoa and bacteria to 



' Contribution from the Biological Laboratory, Bureau of Science, Manila, P. I. 

 - Associate Professor of Zoiilogy in the University of the Philippines. 

 99456 291 



