HTALONEMA. 21 



Holtenia pourtalesii, O. Schmidt, Die Spongien des Meersbusen von Mexico, 

 Seite 65 (1880). 



Geogeaphical Distribution.— Atlantic Ocean : FJorida. 254-324 fathoms. 



Familia HYALONEMATID/E. 



Lyssacina with amphidiscs in the hniitiiig iiiembraiies and 

 pentact pinulae in the dermal and gastral surfaces. 



Genus HYALONEMA. 



Hyalonematidee at the lower end of the funnel-shaped, somewhat 

 spherical body, of which a long and slender root-tuft is observed, 

 the spicules of which are four-toothed anchors. No uncinates. 

 Marginalia are diacts pointed above, with spined distal ray. 



Hyalonema sieboldii. Gray. 



Hyalonema nurahilis, Gray, " On the Coral known as the Glass-plant," Pro- 

 ceedings Zoological Society London, vol. iii. p. 63 (1835). 



Hyalonema sieboldii. Gray, " Note on the Glass-rope, Hyalonema" Annals 

 and Magazine Natural History, ser. 3, vol. xviii. p. 287 (1866). 



Hyalonema sieboldii, W. Marshall, " TJntersuchuugen iiber Hexactinelliden," 

 Zeitschrift f iir wissenschaftliche Zoologie, Band xxv. Supplement, Seite 142 

 ri875). 



Hyalonema sieboldii, W. Marshall, " Ideen iiber die Verwandtschaftsverhiilt- 

 nisse der Hexactinelliden," Zeitschrift fiir wissenschaftliche Zoologie, 

 Band xxvii. Seite 113 (1876). 



Hyalonema sieboldii, Max Schultze, Die Hyalonemen, Bonn (1860). 



Hyalonema sieboldii, F. E. Schulze, Report on the Hexactinellida, Reports 

 on the Results of the Voyage of the ' Challenger,' vol. xxi. p. 190 (1887). 



Geogeaphical Disteibution. — Seas of Japan. 200 fathoms. 



2. Ordo HEXACERATINA. 



Silicea with large, sac-shaped, ciliated chambers, with simple 

 inhalant canals. Skeleton, when present, composed of pithed 

 horny fibres. Without siliceous or calcareous spicules. 



