l08 AET. 1. 1. IJIMA : HËXACÏINELLIDA, lit. 



of them (4-8) to each principal increases. The miinite terminal 

 disc may be marginally toothed or sim2:)ly pinhead-like. Transi- 

 tional forms of the above discohexasters leading into the onychaster- 

 like hexasters have not been discovered. 



DIAGNOSES OF THE FAMILIES, GENERA AND SPECIES 

 TREATED OF IN THIS CONTRIBUTION. 



By way of a summary and conclusion, I reproduce here the 

 definitions I have given to the families and genera treated of in 

 this Contribution, also giving in proper places short diagnoses of 

 the species described. 



EUPLECTELLID^^. 



Lyssacine Hexasterophora of tubular, cup-like or 

 massive body; sometimes stalked; either rooted by a 

 tuft of basal spicules or firmly attached by compact 

 base; generally possessing numerous separate oscula. 

 Dermal skeleton composed of hexactinic dermalia, the 

 proximal ray of which is as a rule much longer than 

 any other in the same spicule; no hypodermal pen- 

 tactins. Hexasters various. 



For a list of the genera referable to the family, see p. 20. 



