Art. 5. — A. Izuka : 



protuberance or side-gland. Parapodium uniramous and conical 

 in shape, with a dorsal and a ventral cirrus; with an aciculum and 

 a bundle of either simple or compound setae. Body transparent; 

 pelagic in habit. 



Key to the genera found in Japan. 



a. Prostomium not prolonged anteriorly beyond eyes. 

 b ' . Parapodium without cirriform appendage. 



c. Setae simple Alciopa Aud. et M-Edw. 



c". Setae compound ... Asterope Clap. 



b". Parapodium with a cirriform appendage; setae compound... 



Vanadis Clap. 



a". Prostomium prolonged anteriorly beyond eyes. 



b'. Parapodium with a cirriform appendage, setœ compound ... 



Cattizona Greeff. 



b" . Parapodium without cirriform appendage; seta? compound 

 Rhynchonerella Costa. 



Genus Alciopa Aud. et M-Edw. 



Prostomium not prolonged anteriorly beyond eyes. Proboscis 

 destitute of teeth. Parapodium without cirriform appendage setae 

 simple. 



Alciopa €!a>i1vahiii (delle Chiaje). 



PI. I, fig. 9. 



1845. Najades Cantrainii, delle Chiaje, Anim. invertebr. della Sicilia, Tom. Ill, p. 99. 



1850. Alciope Edwardsii, Grube, Die Familien d. Armel., p. 305. 



1868. Alciopa Cantrainii, Claparède, Armel, chétop. du golfe de Naples — Suppl., p. 105. 



1868. Alciopa Edwardii, Ehlers, Die Borsten-wurraer, p. 176. 



1876. Alciopa Cantrainii, Greeff, Untersuchungen über die Alciopiden, p. 57. 



1886. Alciope microcephala, Viguier, Etudes sur les animaux inférieures de la baie 



d'Alger. Arch. d. Zool. Expér. 2 Serie, torn. 4, p. 104. 

 1892. Alciopa Edwardsii, Hering, Zur Kenntniss der Alciopiden von Messina, p. 721. 

 1900. Alciopa Cantrainii, Apstein, Die Alciopiden u. Tomopteriden d. Plankton- 

 Expedition, p. 7. 



