120 D. S JORDAN AND J. (). SNYDER. 



Cepola abbreviata should be suppressed. 



Read Murcsna pardalis instead of hycodontis pardalis. 



Head Cotta fi Linnmus, instead of Uranidea. 



The nomenclature of the first thirteen families may be thus revised : 



Class : CEPHALOCORDA. 



Family I (a). Branchiostomidœ 

 (len us : Branchiostoma Costa. 



1 (a). Branchiostoma belcheri ((Tray) NameJcujiuwo. 



Misaki ; several localities in Kynsyu. 



Class : MARSIPOBRANOHII. 

 Order : Hyperotreta. 



Family T (b). Homeidœ. 



Genus I (1)) : Homea Fleming. 



1 (1)). Homea bürgert Girard. 



Family I (c) : Myxinidae 



Genus : Myxine Linnaeus. 



1 (c). Myxine australis Jenyns. 



Enoshima ; Misaki.* 



Order : Hyperoartia. 



Family II. Petromyzonidae. 

 Genus : Lampetra Gray. 



2. Lampetra japonica (Von Martens) Yatsumeunagi. 



Northern and western parts of Japan : many localities recorded 

 by Hat l'A. 



2 (b). Lampetra mitsukurii Hatta (M.S.) Sunayatsume. 



Southern parts of Hondo, from its medium portion south- 

 westerly : many localities noted by Hatta. 



Class : PISCES. 



Subclass : Selachii. 



Family III. Chlamydoselachidœ. 



Genus : Chlamydoselachus Garmau. 



