REPORT ON THE HEXACTINELLIDA. 469 



follow sand with 22*7, Globigcrinca ooze with 24"5, and clay with 28'2 per cent., while 

 hard ground yielded 35"3 per cent., Coral mud 43'8 per cent., and mud (including blue 

 mud) as much as 60*4 per cent. Radiolarian ooze yielded 50 per cent., gravel and 

 stones 6 6 '6 per cent., Pteropod ooze 70 per cent., and Diatom ooze as many as 

 225 per cent. 



As one would naturally expect, the forms equipped with root tuft were principally 

 found on soft muddy ground, on the various kinds of mud and ooze, and on red clay, 

 while those adherent to solid bodies occurred partly on hard ground, gravel and stones, 

 partly also on mud, both volcanic and Coral, on Pteropod ooze and on sand, being in 

 such cases usually found attached to projecting stones or other solid bodies. 



Most of the Euplectellidse, which possess a developed basal tuft, occurred on mud 

 (including blue mud), several also on Globigeriaa and Diatom ooze, and one species on 

 each of the following — Coral mud, red clay, and Eadiolarian ooze. Of the firmly attached 

 Tsegerinse and less definitely classifiable forms, several occurred on Coral mud, one form 

 on volcanic mud and another on red clay. 



Of Asconematidse three species occurred in Diatom ooze, two in Globigeriaa ooze, 

 and one species on each of the following — sand, volcanic mud, and red clay. 



The Rossellidse were represented on very diverse bottoms, the majority (nine species) 

 on sand, several (three on each) on red clay and volcanic mud ; two on sand, two on 

 hard ground, and two on Diatom ooze ; one on gravel and stones, and another on Coral 

 mud. 



The Hyalonematidae (Amphidiscophora) were altogether absent from sand, gravel 

 and stones, Coral mud, and Radiolarian ooze ; while hard ground, green mud, red mud, 

 and Diatom ooze, each yielded one species ; volcanic mud and Pteropod ooze each two ; 

 red clay, three ; mud (including blue mud), six ; and Globigeriua ooze, the majority, 

 namely, eight. 



In regard to Dictyonina, the Uncinataria were altogether absent from green and red 

 mud; one species occurred on each of the following — gravel and stones, red clay, 

 Globigerina ooze, Radiolarian ooze, and Diatom ooze ; two were found on sand, three 

 on hard ground, and the same number on Coral mud, four on Pteropod ooze, five on 

 volcanic mud, and ten on mud (including blue mud). 



Of the few Inermia which were obtained by the Challenger, Coral mud and Pteropod 

 ooze each yielded one, whde volcanic mud and mud (including blue mud) each yielded 

 two species. 



