1915] Srhumaclier: On BJcpharoconjs cqui sp. nov 97 



not agree with any of the above. This new species I call Dlcpliarocorijs 

 equi. 



Of the ciliates occurrint;- in the caeeuni of the horse, this was one of 

 the most difficult to study, both on account of its small size and its 

 rather complicated structure. It was always found in large numbers 

 and in four out of the five hor.ses examined. Its absence in this one 

 case niaj' be correlated with the fact that the host was in an abnormal 

 condition both as regards temperature, which was high, and abnormal 

 intestinal conditions, due to enteritis. 



Morphology 



Seen from the right side (pi. 13, fig. 1), this animal has approxi- 

 mately the shape of a kernel of rice, somewhat asymmetrical, the 

 dorsal side being convex, the ventral side .slightly concave, and the 

 ends rounded. 



The body, which is constant in form, is .stiff, non-contractile, in- 

 elastic and aboiit three times as long as it is wide. It is thickest in 

 the region through the anterior end of the macronucleus {mac, pi. 13, 

 fig. 2). It decreases slowly in thickness from here posteriorly, but 

 anteriorly more rapidly. The greatest width is in a plane passed 

 through the body about midway between the dorsal and ventral sur- 

 faces. 



The anterior end, as seen in side view (pi. 13, figs. 1, 3), contains 

 a large vestibule {vest., pi. 13, figs. 1, 3, 5), the lower wall of which is 

 formed by a ventral lip {v. L). Its dorsal wall is formed by the frontal 

 cap {fr. c). This frontal cap is covered dorsally and partly contin- 

 uous laterally with two dorsal plates (r. d. pi., I. d. pi.). Leading 

 from the vestibule posteriorly into the body beyond its center and 

 showing clearly both the living and preserved animals is a large gullet 

 or oesophagus {ocs.). The anus {an.) is situated at the posterior 

 extremity of the body a little to the ventral side. Dorsal plates, 

 oesophagus, oral region, ventral lip and anal region are ciliated as 

 described later. 



In size this Blepliarocorys stands about midway in the series of the 

 ciliates from the caecum of the horse. The following table gives the 

 dimensions of several members of this species : 



