1S4 CYCLOKTOMATA. 



Sub-class III. CYCLOSTOMATA. 



Order I. HYPEROARTIL 

 Fam. 1. PETKOMYZONID^. 



Jjampreys, with naked eel-shaped body, suctorial mouth, and seven gill-openings on 

 each side. 



1. LAMPETEA, Gray, 1851. 

 iMmpetra, Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 12. 



Five or six species, small Lampreys inhabiting brooks in Europe and North 

 America. 



1. Lampetra spadicea. 



Lawpetra spadicea, Bean, Proc. U.S. Nat. Mus. 1887, p. 374' ; Jord. & Everm. Bull. U.S. Nat. 

 Mus. xlvii. 189G, p. 13, and 1900, fig. 6'; Meek, Publ. Columbian Mus., Zool. v. 1904, 

 p. 2, fig. 1 '. 



Hah. Mexico, Rio Lerma System : 



Guanajuato^-; Lake C'hapala^. 



