A NEW SPECIES OF AVIAN TAPE-WORM. 



155 



Table of 



and No. 5, HymenoUpis upsilon. 



Strobila. 

 Length and Breadth. 



7-13 mm. 



No length or de- 

 scription given. 



12 mm. X 0*5 mm. 

 40 mm. 



2 mm. X 03 mm. 

 30 mm. 



3'712mm. xO-245mm. 



Number of Segments 

 AND Description. 



Very short ; no 

 number given. 



Never more than 



21. 



150-180 segments. 



500 segments. 



Very much 

 broader than long, 

 tongue-shaped. 



60 segments in 

 strobila. 

 500 segments in 



strobila. 



Maximum num- 

 ber of segments in 

 strobila twenty- 

 five ; terminal 

 seven segments, 

 sexual and mature. 



Genitalia. 

 Male and Female. 



(J Cirrus cylindri- 

 cal, claviform. 

 $ No description. 



organs 



Genital 

 sy m metrically 

 placed in strobila 



Genital pores uni- 

 lateral. (J 0084mm, 

 long, covered with 

 bristles or thorns. 

 $ No description. 



Genital pores uni- 

 lateral. S Cirrus 

 without bristles, 

 other organs very 

 imperfectly de- 

 veloped ; 500 -seg- 

 mented worm her- 

 maphroditic seg- 

 ments perfected. 



Genital pores uni- 

 lateral. (? Cirrus 

 hirsute. Three 

 testes. vesicula 

 seminalis exterior 

 and interior. 

 $ Vagina in male 

 sinus, receptacu- 

 lum pyrif orm,shell- 

 and yolk - gland ; 

 ovaries crescentic, 

 fulfil functions of 

 uterus, which is 

 in the form of a 

 Greek v. 



Embryonic Eggs. 



No description. 



Terminal seg- 

 ments contain 

 unripe ova, but egg- 

 masses found de- 

 veloped amongst 

 faeces. 



12 mm,, only 

 immature eggs. 

 40 mm., terminal 

 segments, ripe eggs 

 in masses. 



In 30-mm. worm 

 the terminal seg- 

 ments contained 

 ripe ova. 



Six-hooked brood 

 in terminal seg- 

 ments. Embryonic 

 hooks 0-013 mm. 

 long. Embryo con- 

 tained in two 

 envelopes, possibly 

 three. Egg-masses 

 found amongst 

 faeces, the eggs 

 with three distinct 

 envelopes. 



