48 University of California Publications in Zoology [Vol. 13 



culatum is not correctly referable either to the genus Diplodinium or 

 to Entodinium. In my opinion it may be referred to the genus 

 Blepharocorys Bundle. 



The next work of importance is that of Eberlein (1895), who 

 published a rather voluminous account of his investigations as well as 

 a resume of all that had been done in this field by previous investi- 

 gators. His methods were much superior to those of his predecessors 

 and his work as a whole bears the stamp of thoroughness, complete- 

 ness, and scientific accuracy. He adds one new species, Ophryoscolex 

 caudatus, and claims the discovery of another, which he names 

 Diplodinium caudatum. 



We note that the name Diplodinium caudatum had been used by 

 Fiorentini some five years previously and that Eberlein was aware 

 of this fact, for he says, "Wenn ieh trotzdem die Bezeichnung Diplo- 

 donmm caudatum fiir meine Form gewahlt habe, so geschah das nur 

 deshalb, weil das Diplodinium caudatum Fiorentini 'identisch' ist mit 

 dem von dem gleichen Forscher beschriebenen Diplodinium rostratum 

 und desshalb in Fortfall kommt." Under the code of nomenclature 

 this procedure is inadmissable. In my paper the term Diplodinium 

 caudatum refers to the form described by Fiorentini under this name. 



To the work of Bundle (1895) reference has already been made. 

 It might be well to add, however, that in this paper Bundle considers 

 only those Protozoa which are found in the caecum of the horse and 

 therefore his work is of interest in this connection onlj^ because it deals 

 with animals more or l^ss closely related to those found in the stomachs 

 of ruminants, and because he describes from the caecum of the horse 

 a single ciliate, Buetschlia postciliata, which may be correctly referable 

 to the genus Buetschlia, described from the stomach of ruminants. 



Giinther (1899) published the results of his investigations on the 

 manner of infection of ruminants with these protozoans, together with 

 a very complete account of the process of division in Ophryoscolex 

 caudatus, and describes for the first time a new structure in the body 

 of this animal. This structure he terms the " Stiitzapparat " and 

 suggests that it functions as a support for the retractile gullet. To 

 this part of the paper reference will be made later. 



During the following year Giinther (1900) published a second 

 paper, dealing this time with the finer structure of some of the ciliates 

 both of the ruminants and of the horse, i.e., Ophryoscolex caudatus, 

 Entodinium rostratum, and Diplodinium [sp. ?] from the sheep; and 

 Cycloposthium hipalmatiim from the horse. This paper is of especial 



