BY R. VON LENDENFELD, PH.D. 1111 



I. SUB-FAMILY. VOSMAERIN.E. Von Lendcnfeld. 

 The ciliated chamber-tubes are all situated at the same distance 

 from the main axis of the sponge-person and all stand radially like 

 the simple ciliated tubes of the Syconidae. The layer of ciliated 

 chambers is cylindrical. A thick layer of reticulate exhalent 

 Canals intervenes between the ciliated chambers and the gastral 

 cavity. The inhalent canals also form a reticulation. 



15. GENUS. VOSM^RIA, You Lendenfeld. 



VosuiEerinpe with triradiate, quadriradiate, and acerate spicules. 

 Sensitive cells in small irregularly scattered clusters on the 

 surface. I cannot agree with Pol^jaeff in combining forms like 

 his Leucetta vera and Haeckeliana with different ciliated 

 chambers and a different canal system to one Genus, and I have 

 no doubt that Polejaeff will gladly accept an alteration on this 

 point, according to the structure of the canal system, the 

 importance of which he has very correctly asserted. 



27. SPECIES. VOSM.^RIA GRACILIS. Nov. spec. 



The Sponge has the outer appearance of an ordinary Syconid, 

 is ovate or cylindrical, does not form colonies and attains a length 

 of 25 mm. and a diameter of 12 mm. The circular, tei-minal 

 small Osculum is surrounded by a frill. The gastral cavity is 

 cylindrical, the body wall attains in the central and lower part of 

 the Sponge a thickness of 2-5-4 mm. The ciliated chambers are of 

 the uniform length of 1-1 mm., only towards the Osculum they are 

 shorter. The Sponge appears hairy. The reticulation of the 

 inhalent canals is but slightly developed, that between the ciliated 

 chambers and the gastral cavity on the other hand attains a 

 diameter of 2 mm. In this part of the Sponge the sexual cells 

 are matured. The inhalent canals are narrower than the ciliated 

 chambers. The latter possess a width of 14 mm. The exhalent 

 canals are of very varying dimensions and irregular, sometimes as 

 narrow as 0*05 mm. often attaining a diameter of 1 mm. They 



