520 PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



^ Hexatrema, Girard, Report U. S. Naval Exped. to Chili (pi-ovisional uame), v. 2, 

 p. 251, 1854. 



> Heterotreraa, Girard, Eeport U. S. Naval Exped. to Chili (provisional name), v. 2, 



p. 251, 1854. 



> Heptatrerua, Girard, Eeport U. S. Naval Exped. to Chili (provisioual name), v. 2, 



p. 251, 1854. 



Bdellostomids, with typically 7 (sometimes 6) pairs of branchial aper- 

 tures aud the base of the tongue between the anterior pair of gills. 



MYXINID^. 



Synonymy. 



=:Missiuidi, Bafinesque, Indice d'lttiologia Siciliaua, p. 49 (order), 1810. 

 <[ Cyclostomia, Rafmesque, Aualj'se de la Nature, p. 94, lsl5. 

 = Suceurs, Cuvier, Rfegne Aniuial, t. 2, p. 116, 1817. 

 ^Diporobranchia, Latreille, Fam. Nat. du Regue Animal, p. 112, 1825. 

 <[ Myxiuidte, Gray, List Spec. Fish Brit. Mus., part 1, Chondropteygii, p. 145, 1851. 

 <^ MyxiuidiB, Bonaparte, Cat. Metod. dei Pesci Europei, pp. 9*, 92*, 1846. 

 <; Myxiuoidei, Bleeker, Enum. sp. Piscium archipel. ludico, p. xxxiii, 1859. 

 < Myxinidie, GUnther, Cat. Fishes Brit. Mus., v. 8. p. 510, 1870. 

 := Myxiuidai, Gill, Arrangement Fam. Fishes, p. 25, 1872. 



<^ Gastrohranchi, Fifizinger, Sitzungsber. K. Akad. der Wissensch. (Wien), B. 67, 1. 

 Abth., p. 58, 1873. 



Hyperotreta with the branchial sacs (6 pairs) opening by ducts con- 

 fluent behind into one which opens below on each side of the median 

 line. 



MYXININ^. 



Synonyms as subfamily. 



= Myxinia, Bafinesque, Analyse de la Natnre, p 94, 1815. 



= Gastrobrauchiui, Bonaparte, Giorn. Accad. di Scienze, v. 52 (Saggio. Distrib. Metod. 



Animal. Vertebr. a Sangue Fieddo, p. 41), 1832. 

 = Gastrobranchini, Bonaparte, Nuovi Aunali delle Sc. Nat., t. 2, p. 133, 1838; t. 4, p. 



277, 1840. 

 = Myxinnii, Bonaparte, Cat. Metod. dei Pesci Euroiiei, p. 92*, 1846. 



MYXINE. 



Synonymy. 



Myxine, Linnams, Syst. Nat., t. 1, \>. — ,* 1758. 



Myxine, Betzins, K. Vet. Acad. Nya Handl. Stockholm, v. 11, pp. 110-114, 1790. 

 Gastrobranchus, Block, Allg. Naturgeschichte der Fisches, t. 12, p. 66, 1795. 

 Gastrobranchus, Block, Systema Ichthyologia;, ed. Sckneider, p. 534, 1801. 

 Myxine, Miiller, Abhandl. K. Akad. Wissensch. Berlin, 1834-1843 (passim). 



For the most recenj^ and important information respecting' the species 

 of this genus, the "Notes on the genus Myxine, by F. W. Putnam" 

 (Proc. Boston Soc. Nat. Hist., v. 16, pp.- 127-135, 1871), should be con- 

 sulted. 



* Myxine is referred by Linuaius to the class Vermes, 



