512 MYXINIDiE. 



Home, Philos. Trans. I8I0, tab. 12. fig. 1. 



Bdellostoma hexatrema, Miill. Abhandl. Ah. Wiss. Berlin, 1834, 



p. 79. 



heterotrema, MiM. I. c, 



lieptatrema, Miill. I. c. 



forsterii, Midler, I. c. p. 80, and I808, p. 171. 



? lieptatrema cirrhatuni, bchlcg. Fatm. Japan. I'oiss. p. 310, pi. 14;{ 



(Bdellostoma burgeri, Girard). 



Six or seven gill-openiugs on each side. Twelve or thirteen 

 teeth in the anterior scries, the three foremost confluent at the base ; 

 eleven teeth in the posterior series. 



South Africa ; New Zealand ; ? Japan. 



a. Adult. Table Bay. Presented by J. L. Statham, Esq. 



b. Adult. New Zealand. Presented by Capt. Stokes. 



c. Half-grown. Presented by Dr. A. Giinther. 



2. Bdellostoma polytrema. 



P Gastrobranchus dombey, Laccp. i. p. 531, pi. 23. 

 Bdellostoma polvtrema, Girard, Proc. Ac. Nat. Sc. Philad. 1854, 

 p. 199, or in U. S. Nav. Astroti. Exped. Zool. p. 252, pi. 33. 



Fourteen giU-openings on each side. Twelve teeth in each of the 

 scries. 



Coast of Chile. , 



The single specimen examined is in a bad state of preservation ; 

 and considering the difficulty in distinguishing in examples of that 

 kind between the small gill-openings and pores, 1 cannot help ex- 

 pressing a doubt whether the number of the apertures is really 

 fourteen. 



