512 MTXINID^. 



Home, Philos. Trans. 1815, tab. 12. fig. 1. 



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

 p. 79. 



lieterotrema, Midi. I. c. 



heptatrema, MiiU. I. c. 



forsterii, Midler, I. c. p. 80, and 1838, p. 171. 



? Heptatrema cirrhatum, Scldeg. Faun. Japon. Poiss. p. 310, pi. 143 

 (liJellostoma burgeri, Girard). 

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

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

 eleven teeth in the posterior series. 



Sontli Africa ; New Zealand; ? Japan. 

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

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

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



2. Bdellostoma polytrema. 



? Gastrobranchus dombey, Lacep. i. p. 531, pi. 23. 

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

 p. 199, or in U. S. Nav. Astron. Ejcped. 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 smaU gill-openings and pores, I cannot help ex- 

 pressing a doubt whether the number of the apertures is really 

 fourteen. 



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