BY R. VON LENDENFELD, PH.D. 897 



If we were not to attach great importance to the chemical 

 nature of the skeleton we would have to place the Physemaria — 

 those that are Sponges — in this Suborder because they resemble 

 the Asconidse very closely. I think it very probable that this will 

 be done in future, when the Embryology of these doubtful 

 organisms is better known. 



1. FAMILY. ASCONIDSE. Claus (1.) 



HOMOCCELA WITH A PLAIN POROUS BODY WALL, WITH- 

 OUT ANY COMPLICATION OF THE INNER SURFACE. 



The Asconida? are identical with Haeckel's (2) Ascones. 

 Polejaeff (I.e.), comprises all species in Bowerbank's (3) Genus 

 Lencosolenia. Although the difference between the Genera of 

 Haeckel may in many cases appear trivial, I shall nevertheless 

 adopt them here. The soft parts of only very few have been 

 studied, so that any classification must appear preliminary. 



1. GENUS. ASCETTA. Haeckel, 1872. 

 Asconidse possessing triradiate spicules only. 



1. SPECIES ASCETTA PRIMORDIALIS. E. Haeckel. 



Prosycum primordialis. E. Haeckel. 



Prodromus eines Systems der Kalkschwamme. Jenaische 



Zeitschrift fur Medicin und .Naturwissenschaft, 1870. 



Band V., Heft, 2, p. 236-257. 

 Olynthus simplex. E. Haeckel. 



Prodromus, I.e., p. 237. 

 Leucosolenia dictyoides. E. Haeckel. 



Prodromus, I.e., p. 243. 

 Soleniscus loculosus. E. Haeckel. 



Prodromus, I.e.. p. 244. 

 Clathrina loculosa. E. Haeckel. 



Prodromus, I.e. p. 245. 



(1.) C. Claus. Grundziige der Zoologie, IV., Anflage. Seite 221. 



(2.) E. Haeckel. Die Kalkschwamme, eine Monografie. Band II. Seite 

 11. 



(3.) T. S. Bowerbank. On the Anatomy and Physiology of the Spongiad®. 

 Transactions of the Royal Society of London, Vol. 152, p. 1094. 



