TiENIASIS 179 



teriorly. The number of segments is about 400. The gravid uterus has 

 5-10 branches on each side. 



Length, 1.5-2 meters (57-76 inches). 



Eggs nearly spherical and 31-36 microns in diameter. 



The larva is a cysticercus {Csyticercus tenuicollis) fomid in the per- 

 itoneum and, more rarely, in the pleura of ruminants and hogs. It has 

 also been reported from rodents and monkeys. 



4. Taenia pisiformis (T. serrata). Fig. 98. Taniidse (p. 170). — 

 The head is small, but little broader than the neck. The hooks are 

 large, 225-294 microns long and 34-38 in number. The segments are 

 at first narrow and much shorter than broad; those mature are approx- 

 imately square. The distal segments are elongated (10-15 mm. by 

 4-6 mm.). The posterior margins of the segments project laterally, 

 giving to the lateral margins of the chain a serrated appearance. The 

 genital pores are prominent, and the uterus in gravid segments has 8-14 

 lateral branches on each side. 



Length, 0.5-2 meters (19-76 inches). 



Eggs oval, 36^0 microns long, 31-36 microns wide. 



The larva is a cysticercus {Cysticercus pisiformis) which develops in 

 the mesentery and omentum of rabbits, and has been found in the mouse 

 and beaver. 



5. Multiceps multiceps (Taenia ccenurus). Fig. 113. Tseniidse 

 (p. 170). — The head is small and bears 22-30 hooks. Larger hooks have 

 a handle equal in length to that of the blade and wavy in outline. The 

 segments of the middle portion of the chain are approximately square. 

 The distal segments are elongated (8-12 mm. long by 3-4 mm. wide). 

 The ripe segments are broader at their middle, narrowing toward their 

 ends which gives them somewhat the appearance of a cucumber seed. 

 The genital organs are well developed, 15-20 cm. (6-8 inches) from the 

 head, or toward the 125th segment. The genital pores are irregularly 

 alternate. The uterus has 16-25 lateral branches on each side. 



Length, 40-60 cm. (16-233^ inches). 



Eggs nearly spherical and 31-36 microns in diameter. 



The larva is a ccenurus {Multiceps multiceps; Ccenurus cerebralis) 

 which develops in the cerebral cavity and, more rarely, in the spinal 

 canal of herbivora, usually sheep (Figs. 114 and 116). 



6. Multiceps serialis (Taenia serialis). — Taeniidse (p. 170). The 

 head is a Httle wider than the neck and bears 26-32 hooks. The small 

 hooks have a short blunt handle; the larger hooks a wavy handle as 

 long or a little longer than the blade. The segments are similar to those 

 of M. multiceps, the form of the uterus in gravid segments also being the 

 same. 



Length, 44-74 cm. (17-293^ inches). 



Eggs oval, 34 microns long, 27 microns wide. 



