THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTOEY. 



[FIFTH SERIES.] 

 No. 107. NOVEMBER 1886. 



XXXIV. — Preliminary Report on the Monaxonida collected 

 hy H.M.8. 'Ghallenger'*. By Stuaet O. Ridley, M.A., 

 F.L.S., of the British Museum, and Arthur Dendy, B.Sc, 

 Associate of the Owens College, Mancliester. 



Part I. 



The following brief descriptions of genera and species are 

 published by kind permission of Dr. John Murray, F.R.S.E., 

 Director of the ' Challenger ' Commission. We propose to 

 describe in this place none but the new species, and those 

 only very briefly. The classification adopted is a modifica- 

 tion of those already in use, which seems to meet the require- 

 ments of the case. 



Order MONAXONIDA. 

 Siliceous sponges with uniaxial skeleton-spicules. 



Suborder I. Halichondrina (Vosmaer) . 



Typically non-corticate; skeleton usually reticulate. Skele- 

 ton-spicules usually acerate or acuate. 



* For figures we must refer the reader to our forthcoming- Report, 

 Ann. & Mag. N. Hist. Ser. 5. Vol. xviii. 23 



