der niederen Thiere wälirend des Jahres I8fi3. 153 



Gen. n. Phahellia. Sceleton composed of a multitude of 

 primary cylindrical 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 anastomose. 

 Type : Hai. ventilabrum Johust. 



An diese Genera reiht Verf. noch eine Anzahl von Formen, 

 die sich durch die vorwaltende Entwickelung ihres Basaltheiles aus- 

 zeichnen und dem'Gen. Raspailia Schm. nicht fern zu stehen scheinen. 

 Es sind: 



Gen. n. Microciona. Sceleton a common basal membrane, 

 whence spring at or about right 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- 

 sangninea n. sp. 



Gen. n. Hymerapliia. 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. Hymed e sivi a. Sceleton a common basal membrane 

 sustaining a thin Stratum of disjoined fasciculi of spicula. Sp. n. //. 

 Zeüandica. (Hat pantofifelförmige Körperchen — 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. Hynieniacidon. Sceleton without fibre; spicula 

 without Order, imbedded in irregularly disposed membranous stru- 

 cture. Type : H, caruncula Bow. (Nach Anwesenheit der charakteristi- 

 schen ,.panto£felförmigen" Körperchen Arten des S chmidt'schenGen. 

 Esperia, denen freilich ein reticulirtes Skeletgewebe beigelegt wird. 

 Auch das Gen. Halisarca will Yerf. hier einreihen, weil er bei H. 

 Dujardinii zahlreiche kleine Spicula gefunden habe.) 



Subord. 3. Spiculo-reticulate sceletoüs. Sceleton continuously 

 reticulate in structure, but non fibrous. 



Halichondria Flem. Sceleton without fibre, composed of an 

 irregulär polyserial network of spicula cemented together by keratode. 

 Als Typus dieses artenreichen Geschlechts betrachtet Verf. Hai. 

 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 sj^onge perfo- 

 rated vertically by an extended spiral fasciculus of single elongated 



