16 ILLINOIS BIOLOGICAL MONOGRAPHS [366 



import, since such a condition is easily derived from Andrya by the 

 suppression of the most anterior testes. 



ANATOMICAL CHARACTERISTICS OF THE GENUS ANDRYA 



The additions here made to the knowledge of the genus Andrya 

 necessitate a radical revision of our conception of the group. These 

 changes, briefly, are as follows: 



1. The definition must be changed so as to admit forms in which 

 the testes cross beyond the excretory ducts on the side away from the 

 genital pore. Also, the fact that A. translucida has the testes only on 

 the side away from the pore and mainly in the distal part of the pro- 

 glottid, must be recognized. In the way of more exact definition it 

 should be stated that the testes are always chiefly found on the side 

 away from the pore and usually mainly anterior. 



2. The strictly dextral arrangement of the genital pores which is 

 found in some species, must be given recognition. 



3. It must be recognized that the ovary may be directly median 

 in position. 



4. It must be recognized that the later development of the uterus 

 is by outpocketing, in a manner not different from that occurring in 

 Anoplocephala and Bertiella. 



5. The definition must be changed so as to admit species without 

 a prostate gland. 



6. The position of the vagina and vaginal pore has been shown 

 to be a constant character and should be given recognition. 



7. The point of origin of the oviduct should be mentioned as a 

 distinction from Schizotaenia. 



The diagnosis of Andrya then becomes as follows : 

 Anoplocephalinae, with segments much broader than long, except 

 in the most distal parts of the strobila. A single set of reproductive 

 organs to each segment. Genital pores mostly, or entirely dextral. 

 Genital canals pass dorsal of longitudinal excretory vessels and nerves. 

 Testes chiefly on the side away from the genital pore, usually mainly 

 anterior, and usually extending nearly across the median field ante- 

 riorly; on the side away from the pore they usually extend beyond the 

 excretory ducts. Vagina and vaginal pore strictly posterior to the 

 cirrus pouch. Female glands on the pore side of the median line, or 

 with the ovary median. Oviduct connects with ovary beneath the 

 median lobe of the vitelline gland. Uterus reticular, becoming saccular, 



