426 MONOGRAPH OF THE AUSTRALIAN MARSIPOBRANCUII. 



Type : — Exomegas macrostomus, Gill = Petromyzon macrosto- 

 mus, Burmeister. 



Distx'ibution : — Atlantic coast of South America (Argen- 

 tine Republic); very rare. 



For further information concerning this form consult Burmeister, 

 Anal. Mus. Buenos Aires, pt. 5, 1868, Act. Soc. Palseont. p 

 xxxvi., and Berg, Anal. Mus. La Plata, 1893. 



