74 CONTRIBUTIONS TO AMERICAN HELMINTHOLOGT. 



Ancyracanthus sebratus, n. sp. 



A single female specimen of a worm closely allied to the above 

 was obtained from the auricle of the heart of Coregonus albus, Le S. 

 It only measures 11 mm., and differs from A. cystidicola in the mouth- 

 armature. Instead of having only the two teeth of that species, there 

 are a series of smaller ones disposed, as represented in Fig. 18, round 

 the anterior end. The eggs in this specimen were not mature, but 

 the genital organs were observed to be arranged as in the above 

 species. The structure of the oesophagus is sufficient to place the 

 worm in this genus, and I propose provisionally for it the specific 

 name "serratus." 



Toronto, December, 1878. 



