SPIXACID.E. ERAXCHIOSTOMATID.E. 681 



Family SPINACID.E. 



Genus ACAXTHIAS. 



94. Acanthias vulyaris, Risso. Picked Dogfish. 

 Hab. British Seas. 



(See ed. 8, p. 647.) 



Subclass CYCLOSTOMATA. 

 Family 'PETROMYZONTID JE. 



Genus PETROMYZOX. 



95. Petromyson marinus, Linn. Sea-Lamprey. 

 Hab. British Seas. 



(See ed. 8, p. 647.) 



96. Petromyson fluviatilis, Linn. River-Lamprey. 

 Hab. British Rivers. 



(See ed. 8, p. 648.) 



a-n\ Presented by Mr. Thomas F. Burrows, Jan. 30, 1891. 



97. Petromyzon branchialis, Linn. Fringed-lipped Larnpern. 

 Hab. British Rivers. 



(See ed. 8, p. 648.) 



Subclass LEPTOCARDIL 

 Family BRANCHIOSTOMAT1D.E. 



Genus BRAXCHIOSTOMA. 



98. Branchiostoma lanceolatum (Pallas). Lancelet. 

 Hab. Sea-coasts of Europe. 



(See ed. 8, p. 648.) 



2 \ 



