406 The American Naturalist. May, 
14. M. kolesnikovi from Coregonus Jera, vid. Kolesnikoff, 1866. 
15. M. linearis from Pseudoplatystoma fasciatum, vid. Müller, 1841. 
16. M. schizurus from Esox lucius, vid. Müller, 1841. 
17. M. creplinii from Gymnocephalus cernua, vid. Creplin, 1842. 
18. M. diplurus from Lota lota, vid. Bütschli, 1882. 
19. Chloromyvum mucronatum from Lota lota, vid. Müller, 1854. 
20. C. incisum from Raja batis, vid. Müller, 1851. 
C. W. STILES. 
preservation result in such differences in external appen specific 
portions, that no dependence can be placed on these data for p 
determinations, the only safe generic and specific determination has 
those based on internal anatomy. Careful study along this ge 
yielded unlooked for results. The topographical an 
excretory system was shown in the preliminary already cited mh . 
great value in separating the genera in the family of the Tæn 
it forms the basis of the divisi loyed in the present papery , | 
vision employe Jes recognize 
In the adult tape-worms of sheep and cattle, Dr. Sti 
four genera: 
“A Revision of the adult Cestodes of Cattle, Sheep, and allied anim a pores 
ept. of Agr. 
Stiles, Ph. D., and Albert Hassall, M. R. C. V. S. U.S. D J 
Animal Industry, Bulletin No. 4, Washington, 1893; 103 pp.» 16 plates 
ee 
