SPONGES FROM THE ABROLHOS ISLANDS. 477 
On a Collection oE Sponges from the Abrolhos Islands, Western Australia. 
By Arthur Dendy, D.Sc, P.R.S., F.L.S., Professor of Zoology in the 
IJiiiversityof London (King's College), and Leslie M. Frederick, M.Sc, 
Harold Row Student in the Zoological Department, King's College., 
(Plates 25 & 26.) 
[Read 21st June, 1923.] 
Introduction. 
The collection of Sponges made by Professor Dakin at the Abrolhos 
Islands is a very rich and, in some respects, a very remarkable one. It 
comprises 48 determinable species, of which 12 are regarded as new. The 
collection is especially rich in Calcarea, and includes a number of fine 
specimens of that extremely rare and interesting sponge Grantiopsis cylin- 
drica ; a new species of the no less rare and remarkable genus Lelapia, and 
a new genus of Leucascidse. The Tetraxonida, as usual, form the bulk of 
the collection, but do not include any very striking novelties ; there are, 
however, two rather remarkable new species of Euceratosa. 
The following is a complete list : — 
Order CALCAREA. 
Family Homoccelid^. 
1. Leucosolenia grisea n. sp. 
2. Leucosolenia protogenes Haeckel. 
Family LEUCASCiD.ai;. 
3. Ascoleucetta compressa n. gen. et sp. 
4. Leiwetta chagosensis Dendy. 
5. Leucetta microrapMs Haeckel. 
Family LEUCALTiDiE. 
6. Leucaltis clathria Haeckel. 
Family SYCKTTiDiE. 
7. Sy<-on gelatinosum de Blainville. 
Family Heteropiid^. 
8. Vosmaeropsis mackinnoni n. sp. 
Family GrRANTIID^E. 
9. Grantiopsis cylindrica Dendy. 
9 a. Grantiopsis ci/Undrica Dendy \ar. fniticosa nov. ■ 
