240 



1. MORDACIA MORDAX. AUSTRALIAN LaMPERN. 



Petromyzon moi-dax, Rich. Voy. Erebus & Terror, t. 38, 1845. 

 Mordacia mordax. Gray, Proc. Zool. Soc. 1851. 

 Hah. Tasmania. 



Species of Doubtful Situation in the Family. 



1. Petromyzon appendix. Small Lamprey. 



Petromyzon appendix, DeKay, Nat. Hist, of New York, 381. pi. 64. 

 f. 211. pt. 1; Zool. 1842. 



Hab. N. America, Hudson River. 



" A ring of irregular-shaped corneous processes within the oral 

 orifice, and a large isolated double tooth of the same texture on the 

 inferior portion of the mouth." — Be Kay. 



2. Petromyzon tridentatus. Tridentate Lamprey. 



Petromyzon tridentatus, Gairdener, Rich. Faun. Bor. Amer. 293, 

 1836 ; Ue Kay, Nat. Hist, of New York, 381. pt. 1 ; Zool. 1842. 

 Hab. N. America, Falls of the Walamet. 



3. Petromyzon argenteus. Silvery Lamprey. 



Petromyzon argenteus, Bloch, t. 415. f. 2; Schneid. Bloch, 532. 

 t. 102. f. 1, 1801 ; Shaw, Gen. Zool. v. pt. 2. p. 262, 1841. 

 Hab. Indian Seas. 



4. Petromyzon bicolor. Brilliant Lamprey. 



Petromyzon bicolor, Shaw, Gen. Zool. v. pt. 2. p. 263, 1804. — 

 Petromyzon niger, Lacepede, iv. 667. 

 Hab. Europe, Seine. 



5. Petromyzon plumbeus. Leaden Lamprey. 



Petromyzon plumbeus, Shaw, Gen. Zool. v. pt. 2. p. 263, 1804. 

 — Petromyzon Septceil, Lacepede, iv. 667. 

 Hab. Europe, Seine. 



B. Ammocoetina. Teeth none; eyes none. 



7. AMMOCCETES. 



Teeth none. 



Ammocoetes, Dum. Zool. Anal.; Guv. Reg. An. ii. 118, 1817; 

 Mxill. Abhandl. Akad. Berlin, 1834, 78 {\836).—'!Lampreda, Rafin. 

 Anal. Nat. 94, 1815. 



1. Ammoccetes branchialis. Pride or Sandpiper. 



Ammocoetes branchialis, Dum. ; Flem. Brit. An. 164. sp. 3, 1828; 

 Cuv. Reg. An. 406, 1829; Miill. Mem. de I'Acad. Berlin, 1834; 

 Jen. Man. Brit. Vert. 522. sp. 212, 1835 ; Yarr. Brit. Fish. 2 ed. ii. 



