26 ILLINOIS BIOLOGICAL MONOGRAPHS [376 



proximad with several turns over the ventral surface of the latter. 

 The vitelline duct extends as a large channel into each lobe of the gland. 

 The uterine duct, after passing thru the voluminous shell gland, takes 

 a crooked but regular course forward and mediad to the uterus. The 

 very slender transverse uterus extends laterad at either end to beyond 

 the nerve trunks. Development is by extension and outpocketing in 

 the usual manner. The anterior pockets number 44 to 51; the poste- 

 rior, 28 to 34. The ovary, in individuals from the gopher, is small, 

 just reaching to the median line on the left, and not reaching the 

 excretory duct on the right. In the specimen from Evotomys, the 

 uterus is somewhat larger. The ovary does not cross the uterus 

 anteriorly. 



The embryo is typical. The outer membrane is usually elongate, 

 or of other shape, due apparently to pressure. When spherical, it 

 measures 39 to 43/t in diameter. The middle membrane is loosefitting 

 and irregular. The embryo itself measures 12jt in diameter. It has a 

 typical pyriform apparatus whose length, plus that of the embryo, is 

 19 to 22/i. 



The dorsal excretory duct lies laterad of the ventral. The inner 

 duct curves very strongly laterad in the middle of the proglottid; the 

 curve of the outer is much less. The transverse duct is sinuous in 

 dorsoventral plane. 



THE GENUS ANOPLOCEPHALA 



The genus Anoplocephala has served as a refuge for inadequately 

 described species throughout its history. Most of the older species of 

 the family Anoplocephalidae have been placed here at one time or 

 another; as they have become better known, they have been removed 

 one by one to other genera. Many of the names given have also been 

 shown to be synonyms. Recently, von Janicki (1910), studying the 

 cestodes from the hyrax, found that five of these supposed species did 

 not belong even to the subfamily. Deiner (1912) has recently given 

 an excellent and thoro description of "Anoplocephala" magna Murie; 

 for reasons stated on page 40 I have transferred this species to the 

 genus Schizotaenia. I have made the same disposal of Anoplocephala 

 (Taenia) gigantea, whose anatomy MacCallum and MacCallum (1912) 

 have recently investigated in a thoro manner. 



Unfortunately, however, many of the species assigned to the genus 

 still remain practically unknown; and more unfortunately, still other 

 inadequately described species are being added. Thus, Mello (1912) 

 thrusts upon the world A. minima, without giving any information 



