NO. 2258 TAENIOID CESTODES OF DOGS AND CATS— HALL. 



37 



mm. long. Terminal gravid segments are 4 to 5.5 mm. long and 

 3.5 to 4.5 mm, wide. The genital papillae are extremely large, oecu- 

 pjdng practically the en- 

 tire lateral margin of a 

 segment, except in the ter- 

 minal gravid segments, 

 and attaining a diameter 

 of about 1 mm. 



31 ale genitalia. — -The 

 cirrus pouch is elongate 

 piriform and apparently 

 does not extend to the lat- 

 eral excretory canals. 



Female genitalia. — 

 Vagina often pigmented. 

 Median stem of the uterus 

 has about 10 lateral 

 branches on each side. 

 Eggs relatively small. 



Hosts. — Primary : Canis 

 familiar is. Secondary: 

 Rang if er tarandus {Taran- 

 dus rangifer) . 



Location. — In intestine 

 of primary host. In vol- 

 untary musculature of sec- 

 ondary host. 



L o cality . — I c e 1 a n d , 

 Alaska. 



Life history. — Eggs pro- 

 duced by the adult worm in 

 the intestine of the pri- 

 mary host pass out and are 

 ingested by the secondary 

 host in contaminated food 

 or water. In the digestive 

 tract an embryo is released 

 and makes its way to the 

 nmsculature and heart of 

 the host animal. Here it 

 develops to the larval 

 stage, known as Cysticerftis 

 taramdi. On the ingestion of this bladderworm by the primary host, 

 the caudal vesicle digests and the head develops segments forming th(& 

 strobilate worm. 



Fig. 41.— Taenia kkabbei. Entire strobila. Actual 

 SIZE. After Moniez, 1880. 



