Œsophagostomes of Goats, Sheep and Cattle

Abstract

A Recent study by the writer (1924) on the type species of the genus Œsophagostomum, O. dentatum, from the pig, has brought to light certain interesting anatomical features and shown the desirability of a closer examination of the members of the genus occurring in other farm animals.Three species of these are well known, namely, O. columbianum, O. radiatum and O. venulosum, and have been dealt with fairly completely within recent years by Ransom (1911) and Railliet and Henry (1913), but even in the accounts of the worms given by these authors, there are certain differences concerning details of structure, which suggest the need for further investigation. Again, in studying O. dentatum, it was found that the genital cone of the male had a well defined structure, and it seemed of interest to determine whether the genital cones in the other species were built on the same general plan as that of O. dentatum, and whether they possessed specific differences from it and amongst themselvse