INTKODUCTION. 6 



n. Farrea sollau F. E. Sell. 



10. Pcriphragella cUxce Marsh. 



11. Aphrocallistes bocagei Wright. 



12. ,, raniosus F. E. Sch. 



13. ,, vadu.-i „ ,, ,, 



14. (J/ionelasnta dosderleini ,, ,, „ 

 1.3. ,, caly.r „ ,, „ 

 l(j. Hexnctliiclla tuhulosa „ ,, ,, 



17. ,, vcntilabruiih F. E. Sch. 



With the exception of Euplectella oweni, which I believe is 

 a native of southern Japan, all were from the Sagami Sea. 

 That so many species have become known from this locality, is 

 due to the labors of Dr. Doderleix, who long collected there. 



I can not at present tell exactly to what extent the above 

 number of species will be increased through my own investiga- 

 tions, since a portion of my Dictyonine materials yet remains 

 to be worked over. However, taking the Lyssacina alone, I may 

 say that from the Japanese coast thus far nearly 50 species 

 belonging to that group have become known to me. Out of 

 that number, no less than 44 are from the Sagami Sea, — a very 

 considerable augmentation of the o formerly known Lyssacine 

 species from the same locality (Nos. 2-6 of the above list). As 

 regards the Dictyonina, I do not tliink the number of species 

 can be increased in the same proportion, but I expect to be 

 able to make several additions at least. And after all, I shall 

 believe that I have made but a beginning in hauling up to 

 light the rich Hexactinellid fauna of our neighboring seas. 



The specimens which served as the basis of this work are 

 for the greater part preserved in the Museum of the Zoological 

 Institute of the Science College. An important contingent to 



