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Gen. n. Phakellia. Sceleton composed of a multitude of 
primary eylindrical axes, radiating from a common base and rami- 
fying continuously, from which emanate at about right angles to 
the axes secondary series of ramuli, which ramify continuously as 
they progress towards the surface, but never appear to anastomoöse. 
Type: Hal. ventilabrum Johnst. 
An diese Genera reiht Verf. noch eine Anzahl von Formen, 
die sich durch die vorwaltende Entwickelung ihres Basaltheiles aus- 
zeichnen und —. Gen. Raspailia Schm. nicht fern zu stehen scheinen. 
Es sind: 
Gen. n. Microciona. Sceleton a common basal membrane, 
whence spring at or about riecht angles to its plane numerous se- 
parate columns of spicule intermixed with keratose, furnished ex- 
ternally with spicula, which radiate from the columns at various 
angles towards the dermal surface of the sponge. Type: M. atro- 
sanguinea N. ‚SP. 
Gen. n. Hymeraphia. Sceleton a single basal membrane, 
whence spring numerous large separate spicula, which pass through 
the entire thickness of the sarcodous stratum, to or beyond the 
dermal surface of the sponge. 
Gen.n. Hymedesmia. Sceleton a common basal membrane 
sustaining a thin stratum of disjoined fasciculi of spicula. Sp.n. H. 
Zetlandiea. (Hat pantoffelförmige Kusupenelten — retentive spicula 
Bow. — wie Esperia.) 
Subord. 2. Spiculo-membranous sceleton. Composed of in- 
terstitial membranes having the sceleton-spicula irregularly disposed 
on their surfaces. 
Gen. n. Hymeniacidon. Sceleton without fibre; spicula 
without order, imbedded in irregularly disposed membranous stru-. 
‚cture. Type: H.caruncula Bow. (Nach Anwesenheit der charakteristi- 
schen „pantoffelförmigen“ Körperchen Arten des Schmid t’schen Gen. 
 Esperia, denen freilich ein reticulirtes Skeletgewebe beigelegt wird. 
Auch das Gen. Halisarca will Verf. hier einreihen, weil er bei H. 
Dujardinii zahlreiche kleine Spicula sefunden habe.) 
Subord. 3. Spiculo-reticulate sceletons. Sceleton eontinuously 
reticulate ın structure, but non fibrous. 
Halichondria Flem. Sceleton without fibre, composed of an 
irregular polyserial network ofspicula cemented together by keratode. 
Als: Typus dieses artenreichen Geschlechts betrachtet Verf. Hal. 
panicea Johnst. (= Suberites Schm.) 
Gen. Hyalonema Gray. Sceleton an indefinite network of 
siliceous spicula, composed of separated elongated fasciculi reposing 
»on continuous membranes, having the middle of the sponge perfo- 
rated vertically by an extended 'spiral fascieulus of single elongated 
