NO. 2258. TAENIOID CESTODES OF DOGS AND CATS— HALL. 77 



9. Hooks 26 to 52 in uuniber. Well developed sphincter vaginae. 



Taenia iaeniaciorniin, p. 9. 

 Hooks 28 to CO in number. Probably identical with the preceding species. 



Taenia laiicoUis, p. 8. 



10. Vagina with a reflex curve near the lateral excretory caual^^. Large 



hooks 135 to 180 fi long and usually with a sinuous handle. 



Multiceps, 11, p. 39. 

 Vagina without a reflexed curve near the lateral canals Taenia, 13, p. 6. 



11. Mature segments wider than long; the lateral margins of each segment 



often scalloped as a result of a number of constrictions or furrows 

 passing around the segment ti'ansversely ; the posterior margin of each 

 segment prolonged posteriorly to overlap the anterior margin of tlie suc- 

 ceeding segment like a cuff. Small hook with short, blunt curving handle. 

 Genital papilla very narrowly coiiical and in posterior half of segment, 

 often near posterior margin. Larva a coenurus witli daughter bladders, 

 found in the connective tissue of rodents (including the Lagomorpha). 



Multiceps serialis, p. 51. 

 Mature segments longer than broad ; the lateral margins of each segment 

 smooth and not scalloped ; the posterior margin of each segment pro- 

 longed very little or not at all to form a projection over the following 

 segment. Small hooks with long slender handle. Genital papilla pos- 

 terior of middle of segment but never near posterior margin. Larva a 

 coenurus without daughter bladders, found in ungulates, especially 

 ruminants 12. 



12. Small hook witli long curving handle terminating in a blunt distal ex- 



tremity. Large hook with tapering handle with sinuous outline. Testes 

 do not extend posterior of the ovaries to the vicinity of the vitellarium 

 or between the vitellarium and the ovaries. Larva a coenurus in the 

 central nervous system of ungulates, especially run:iinants. 



Multiceps multiceps, p. 40. 

 Small hook with long straight handle terminating in a blunt distal ex- 

 tremity. Large hook with the handle not tapering, and either straight 

 and blunt or bent dorsally just at the tip. Testes extend posterior of 

 the ovaries, almost to the vitellarium and between the vitellarium and 

 the ovaries. Larva a coenurus in the central nervous system, lungs, 

 parenchymatous organs and connective tissue of ruminants. 



Multiceps gaigeri, p. 45. 



13. Forms in which the vagina crosses the ovary on the pore side in some seg- 



ments, and forms in which the very large genital papilla is practically as 

 long as the margin of the narrow segments. Bladderworms in the 



musculature of food animals 14. 



Forms in which the vagina does not cross the ovary on the pore side, and 

 in which the genital papilla is never nearly as long as the margin of 

 the segments 15. 



14. Gravid uterus with 20 to 25 latei'al branches on each side of the median 



stem. Vagina crosses the ovary on the pore side in some segments. 

 Genital papilla much shorter than the segment margin. Bladderworm 



in musculature of sheep Taenia ovis, p. 32. 



Gravid uterus with not over 10 lateral branches on each side of the 

 median stem. Vagina does not cross the ovary on the pore side of the 

 segment. Genital papilla practically as long as the lateral margin of the 

 narrow segments. Bladderworm in the musculature of reindeer. 



Taenia krahbei, p. 36. 



