NO. 2258 TAENIOID CEST0DE8 OF DOGS AND CATS— HALL. 27 



and mountain beaver. The records from Lepus sylvaticus by Stiles 

 and Hassall (1894^/) are covered in the above list by S. f. mcdlurus. 

 Other American records are given by Welch (1890a), Curtice 

 (1892^), Garrison (1911), Sommer (1896), Stiles and Hassall 

 (1898a), Young (1908a), Ward (1895a and 18975), Leidy (1855 and 

 1891a), and Hall (1913). 



Taenia novella Neumann, 1896/, has been regarded here as a syno- 

 nym of Taenia pisiformis. It has already been noted in the discus- 

 sion of Taenia latirollis that Liihe (1910) has regarded T. novella 

 as a synonym of T. laticollis and the reasons given for disagreeing 

 •with this view. Neumann's specimens had a globular piriform head, 

 1.12 to 1.22 mm. in diameter, with four prominent suckers of slightly 

 oval contour, 400 by 340 [x in diameter, and with a slightly prominent 

 rostellum with a central depression and bearing 40 to 42 hooks. 

 The large hooks (fig. 33) are 250 to 260 jx long with a thin handle 

 of undulant contour and a little lonser than the 

 blade. The su^^all hooks are 150 to 155 \i. lone: with a 

 quite long handle and a broad cordiform guard. The 

 neck is about 3 mm. long. Substantially all of the 

 above is in agreement with the description of Taenia 

 pisifonnis, and the parts that are not in exact agree- 

 ment are well within the limit of variation already' 

 known. The large hooks of T. novella are described ^^^ 33 _ taenia 

 as having a thin handle of undulant contour. An novella, larqe 

 examination of the figure given by Neumann shows x^ioo.^aTtkr 

 a handle which I would describe as thick, showing Neumann, 1893. 

 merely the inadequacy of such relative terms. The rs^xt^pian'ORm^ 

 figure is very distinctly that of the large hook of 

 T. pisiformis. The undulation in outline is very slight, much less 

 than that found by Stevenson (1904) in his study of the variation 

 of the hooks of T. pisifoi^mis. Practically the same comments ap- 

 ply to Neumann's statement that Taenia novella has a long handle. 

 His figures show that it is relatively longer and narrower than the 

 usual handle in T. pisiformis., but it is well within the limits of 

 variation shown for these hooks by Stevenson. His statement that 

 the neck is 3 mm. long, is probably based on unmounted material, 

 while the measurements I have given are based on stained mounts, 

 and hence are due to the difference between a gross measurement and 

 a microscopic measurement. 



Neumann had 23 specimens of T. novella., the largest specimen 

 being 33 mm. long. This fact not only would influence the measure- 

 ment of the neck, in all probability, but it suggests that the worms 

 might have been in a host animal in which they had not come to 

 maturity and in which they possibly never could mature. Taenia 

 pisiformis is certainl}'' not a normal parasite of the cat, but it might 



