355] AXOPLOCEPHALIDAI—DOUTHITT 



INTRODUCTION 



The present paper gives the results of studies begun at the Univer- 

 sity of Illinois in December, 1910, and carried on, between numerous 

 interruptions, to the present time. 



My purpose has been to make a comparative anatomical study of 

 the Anoplocephalidae, but since so few of the individual representatives 

 of the family have received adequate study, it has been necessary for me 

 to give most of the time to the individual study of undescribed or poorly 

 described species. The work lacks much of being complete; many of 

 the genera I have not had opportunity to study myself. Other work 

 compelled me to lay the task aside, and it seems advisable to make public 

 the results already obtained. 



My thanks are due to Professor Henry B. Ward for assistance of 

 many sorts; to Professors Robert T. Young, M. J. Elrod, and R. A. 

 Lyman, Drs. B. IT. Ransom, and John E. Gutberlet, for materials placed 

 at my disposal for study; also to Miss Bertha E. Martin for criticisms 

 and assistance in preparing manuscript. 



ANATOMICAL DESCRIPTION OF SPECIES AND GENERA 



Andrya primordialis sp. nov. 

 [Figures 1-4] 



Two specimens of this cestode, one without scolex, were taken from 

 a red squirrel (Sciurus hudsonica) at Bemidji, Minnesota, in Septem- 

 ber, 1911. Since about 20 squirrels in all were examined, there and at 

 Brainerd, Minnesota, it seems that this species is rare, at least as far as 

 this region and host are concerned. Other species of squirrels from 

 these and other localities were likewise uninfected with this species. 

 Its close relationship to the ancestral types of the Anoplocephalidae 

 seems evident, even tho based upon a study of so few specimens. 



The worms, neither of which are fully grown, have a length of 40 

 mm. and the single complete specimen has 155 proglottids. The strobila 

 increases in width to the posterior end, there being 1 mm. in breadth. 

 The first proglottids are 290/x wide and one-eighth as long. Mature 

 proglottids are half as long as wide, and the proglottids farther back 



