4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 



this does not appear to be a correct interpretation, since young adult 

 specimens show merely a slight wrinkling of the cuticle in this region, 

 the wrinkling becoming more pronounced with age. The most out- 

 standing difference between A. cestus and A. acipenscrina is that the 

 esophagus is only 9 to i6 percent of the body length in the former 

 species, whereas it is 2)7 to 47 percent of the body length in the 

 latter species. Tendencies toward cuticular modification are present 

 in some other species of the genus, but such modifications usually 

 take the form of serrate annules. 



REFERENCES 

 Baylis, H. a. 



1929. Parasitic Nematoda and Acanthocephala collected in 1925-1927. 

 Discovery Reports, vol. i. pp. 541-560. 

 Mueller, F. F., and Van Clbiave, H. J. 



1932. Parasites of Oneida Lake fishes. Part II. Descriptions of new 

 species and some general taxonomic considerations, especially 

 concerning the trematode family Heterophyidae. Roosevelt Wild 

 Life Ann., vol. 3, no. 2, pp. 79-138. 



EXPLANATION OF PLATE 



Parathclandros anolis, n. sp. 



Fig. I 



Fig. 2 



Fig. 3 



Fig. 4 



Fig. 5 



Fig. 6 



Head of female, en face view. 

 Esophageal region of female, lateral view. 

 Cross-section of male, showing lateral alae. 

 Posterior end of male, lateral view. 

 Cross-section of female, showing sublateral alae. 

 Tail of female, lateral view. 



Ascarophis cestus, n. sp. 



Fig. 7. Head, en face view. 



Fig. 8. Head, dorso-ventral view. 



Fig. 9. Vulvar region of female, lateral view. 



Fig. 10. Caudal region of male, somewhat twisted. 



, 



