NO. 2258 TA^NIOID CE8T0DES OF DOGS AND CATS— HALL. 



28 



Schrank, 1788a; Taenia serrata canis domestici et vulpis Rudolphi, 

 1793a; Cysticercus pisiformis (Bloch, 1780a) Zeder, 1803a; '■''Taenia 

 serrata Goeze " of most authors ; Taenia novella Neumann, 1896/. 

 (For additional synonymy see Stiles and Stevenson, 1905a.) 



Specific diagnosis. — Taenia: Head (fig. 28) 1.3 mm. in diameter. 

 Rostellum large and powerful, 515 to 640 [jl in diameter, and armed 



MO mm 





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Fig. 28.— Taenia pisiformis. Head, viewed from the front. 



Fig. 29.— Taenia pisiformis. 

 Large and small hooks.' 



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with a double crown of 34 to 48 strong hooks. The large hooks (fig. 

 29) are 225 to 294 [jl long. They have a strongly curved blade; the 

 handle is very long and, observed from the side, usually has straight 

 sides, gradually diverging distally to a blunt rounded termination, a 

 truly club-shaped handle, which passes 

 dorsally rather directly into the blade save 

 for a short elevation dorsally, which is 

 usually present at the union of the blade 

 and handle; the guard is rather long, 

 thickest in its median portion, thinning: 

 slightly at its union with the blade and 

 handle, and terminating distally in a 

 bluntly rounded cone. The handle and 

 guard form a very obtuse angle. The 

 small hooks (fig. 29) are 132 to 177 [x long. 

 They have a strongly curved blade; the 

 handle, viewed from the side, is thick and rather short, its sides dis- 

 tinctly or slightly curved and approximately parallel, the convexity 

 of the curve being ventral, and terminating as a rule, in a bluntly 

 rounded end distally; the guard is usually distinctly and often 

 strongly bifid (fig. 30), the depth of the cleft varying, rather oval in 



!omm 



Fig . 30.— Taenia pisiformis. Large 

 and small hooks a3 seen in a 

 lateral view of the head. 



