CATALOGUE OF VERTEBRATES. 657 



any benefit conferred by them upon the agricultural interest, 

 however, renders the absence of any fact concerning them of no 

 importance." — [C. C. A.] 



Ox^ASS FISCES. 



Fishes. 



(Cyclostomi.) 



Eel-shaped fishes, without limbs, ribs, jaws ; nasal aperture single 

 and mouth suctorial (circular). 



Order HYPEROTRETA. 



Nostril tube-like, penetrates palate ; snout with eight barbels ; two 

 comb-like series of teeth on tongue; gill apertures far from head. 

 Burrow into the flesh of other fishes. 



Family MYXINIDiE. 



Hagfishes. 



MYXINB, L. 

 M. glutinosa, L. {limosa, Grd.) Hagfish. Borer. Sleepmarken. 



No eyes ; two rows of mucous glands below, secreting much 

 slime ; blue above, whitish below. Not abundant on our shores. 



Order HYPEROARTIA. 



Nasal duct does not penetrate the palate. 



Family PETROMYZONTID^. 



Liampreys. 



Body naked, cylindrical anteriorly and compressed behind ; mouth 

 armed with horny teeth, resting on papillfe ; eyes present ; seven 



2r 



