104 Univcjsify of California Publications in Zoology [Vol. Ki 



process projecting therefrom. Dorsal surface more or le.ss convex ; 

 ventral surface slightly concave. Right and left dorsal plates on an 

 interior prolongation of the body, the frontal cap. No retractile peris- 

 tome. Mouth a simple more or less circular opening situated in the left 

 posterior end of a vestibule near the ventral side of the body. Oeso- 

 phagus funnel-shaped, ciliated along its dorsal surface. Cilia on 

 dorsal plates, in gullet and anal region ; membranelles in oral and 

 ventral lip regions. Rest of body naked. Large heart-shaped maero- 

 niicleus and a single small micronucleus. Anvis in the posterior end 

 of the body. A single large contractile vacuole in the anal region. 

 Locomotion slow, with frequent turning about the long axis of the 

 body. Food consisting of bacteria and fine pieces of fodder. Length, 

 50ju. Pound in the caecum of the horse. 



Transmitted September 30, 1915. 



Zoological Laboratory, 



University of CALiroRNiA. 



LITERATURE CITED 



FlORENTIXI, A. 



1890. Intorno ai protisti dell 'intestino degli equini (Pavia, Bizzoni). 24 

 pp., .5 pis. 

 Bundle, A. 



1895. Ciliate Infusorien im Cocum des Pferdes. Zeit. f. wiss. Zool., 60, 

 284-3.50, pis. 15-16. 

 Sharp, R. G. 



1914. Diplodiiiium ecaudatum with an account of its neuromotor apparatus. 

 Univ. Calif. Publ. Zool., 13, 43-122, pis. 3-7, 4 figs, in text. 



