AST. 26 FOUR NEW TREMATODE WORMS MacCALLUM 3 



SQUALONCHOCOTYLE SQUALI, new species 



Plate 1, Figitre 1 



Speciiic diagnosis. — SqualonchocotyU : On the gills of Squalus 

 acanthias (spiny dogfish) there were found several examples of tliis 

 worm. 



Figure 1. — Form of hooks of mouth suckers and small booklets in 

 appendix of: a, a' (respectively), Squaloncfwcotyle cams; b, h', 

 8. acanthi, c, c', Acanthonchocotyle musteli; d, d' , Squalonchocoiyle 

 vulgaris; e, e' , S. sphyrnae; }, {' S. squall 



Length, 7 to 10 mm. ; breadth, about 1.5 mm. The mouth sucker is 

 in the form of a small round knob with transverse slit, and narrower 



