4 University, of Michigan 



end proglottid has been lost. The segmentation is evident, the 

 inter-proglottidal furrows being well marked. 



The four suckers are muscular, deeply cupped, and 0.087 

 mm. in diameter with a cavity 0.056 to 0.06 mm. in diameter. 

 An apical fifth sucker, figures i and 2, is present. It is con- 

 siderably smaller and weaker than the four. It has a shallow 

 cup, is muscular and has the appearance of being functional. 

 Its diameter is 0.043 ^^• 



Genital organs, figures 4, 5, and 6, are arranged on the well 

 known Proteocephalid plan. There is no genital papilla. The 

 genital sinus is marginal, irregularly alternating, anterior to 

 the middle, being situated in the anterior two-fifths of the pro- 

 glottid. The cirrus-pouch is relatively short, reaching barely 

 through the dense vitellaria. Five cirrus-pouches from ripe 

 proglottids average 0.114 mm. long by 0.053 i^"*'^- broad. The 

 longest of these measures 0.127 by 0.050 mm. and the shortest 

 0.099 by 0.050 mm. The maximum width of cirrus-pouch was 

 0.057 ni^- The cirrus and ductus ejaculatorius form two or 

 three coils within the cirrus-pouch. A completely protruded 

 cirrus has not been seen but from the character of the nonex- 

 truded cirrus it is evident that it cannot be extended 

 far. Coils of the vas deferens form a loose mass extending to 

 the mid-field of the proglottid. There are about 60 to 64 

 testes which appear to lie in one layer filling the space anterior 

 to the ovarian lobes and between the vitellaria. Testes meas- 

 ure about 0.035 by 0.027 mm. The largest ones measure about 

 0.040 by 0.037 ^^^^- and the smaller 0.030 by 0.020 mm. 



The vagina opens into the genital sinus anterior and some- 

 what dorsal to the cirrus-pouch. In its course to the mid-field 

 of the proglottid it may lie anterior to the cirrus-pouch or it 

 may cross the pouch dorsally. A sphincter vaginae seems to 

 be lacking or if present is very weakly developed. It has not 



