NO. 2258 TAENIOID CESTODES OF DOGS AND CATS— HALL. 41 



(Batsch, 1786a) Rudolphi, 1808«y Polycephalus coenurus Tschudi, 

 1837(2/ Taenia multiplex Leuckart, 18526/ Taenia coenurus (Tschudi, 

 1837«) Kiichenmeister, 1853c/ Multiplex multiplex (Leuckart, 

 18526) Liautard in Hall, 1911 (reviewer's error). (For additional 

 synonyms, see Hall, 1910.) 



Specific diagnosis. — Multiceps: The head is piriform in lateral 

 view and presents a square outline when viewed en face, and is about 

 800 [J, in diameter. The weakly developed rostellum is about 300 [x in 

 diameter and bears a double crown of 22 to 32 hooks. The large 

 hooks (fig. 43) are 150 to 170 pi, long. The blade has only a slight 

 curvature; the handle is straight in its general direction, its dorsal 

 and ventral borders sinuous and subparallel, commonly notched on 

 the dorsal border at a point between the middle of the handle and 

 the union with the blade, tapering more or less toward the distal 

 extremity and tending to turn dorsally at this extremity; the guard 

 is subcylindrical proximally and more or less 

 conical distally, usually with a slight thicken- 

 ing at the union of the proximal and distal 

 portions. The small hooks are 90 to 130 [j. 

 long. They have a blade of moderate to strong- 

 curvature; the handle is relatively long and 

 tapering, usually curved, with the convexity 

 on the dorsal side, along most of its length i/?nmm' 



and with the distal extremity turning dorsally ; 

 the guard, in lateral view, is usually subcylin- fig. 43. - multiceps multi- 

 drical in the proximal portion and irregularlv ^'^'^^- large and small 



• 1 T 11 1-1 • " HOOKS. 



rounded conical distally, the thickest point 



being at the union of the proximal and distal portion, and is glightly 

 grooved in the median line in a way which gives the hook in some 

 views the appearance of being bifid. The suckers are located at the 

 corners of the head and have a diameter of 290 to 300 [jl. There is a 

 distinct neck which may be 2 to 3 mm. long from the posterior margin 

 of the suckers to the first distinct segmentation. The strobila 

 (fig. 44) attains a length of 40 to 100 cm., and consists of 200 to 250 

 thin and relatively translucent segments, with a maximum width of 

 about 5 mm. The genital primordia appear rather late and the first 

 things to stain clearly in toto mounts are the genital pore and the 

 genital canals from the genital pore inward. The pores are distinct 

 about 4.7 cm. back of the head, in about the eighteenth segment. 

 The segments are mature about 10 to 18 cm. back of the head, the 

 first mature segment being about the one hundred and twenty-fifth. 

 The mature segments (fig. 45) are either square or oblong and longer 

 than wide, but not wider than long. Mature segments have gently 



