8ponq» 1 
SPONGIIDA. 
BY 
Stuart 0. Ridley, M.A., F.L.S., F.R.M.S. 
Chief Works on Recent Sponges. 
1. Carter, H. J. (a) History and Classification of the known Species 
of Spongilla. Ann. N. H. (5) vii. p. 77, pis. v. & vi. (b) On Spon- 
gilla cinerea ; tom. cit. p. 263. 
The first paper contains a descriptive account of all the fresh-water 
Sponges known to the author ; the old genus Spongilla is divided into a 
number of genera, mainly by the characters of the reproductive gem- 
mule (‘ statoblast’ of the author). 
2. . Supplementary Report on Specimens dredged up from the 
Gulf of Manaar, together with others from the Sea in the vicinity of 
the Basse Rocks and Bass’s Straits respectively, presented to the 
Liverpool Free Museum by Captain H. Oawne Warren. Tom. cit. 
p. 361, pi. xviii. figs. 1-9. 
Relates chiefly to Sponges from the above localities, in Ceylon and 
Australia, describes 16 new species from various families, and gives a 
list of the species described by him altogether from these localities [see 
Zool. Roc. xvii. Spong. p. 1]. 
3. . Contributions to our Knowledge of the Spongida. Order ii. 
Ceratina. Op. cit. (5) viii. p. 101, pi. ix. (part). 
Notes on some of the families and genera. 
4. . On the Development of the Fibre in the Spongida. Tom. cit. 
p. 112, pi. ix. (part). 
5. . A. Contributions to our Knowledge of the Spongida. Order iii. 
Carnosa. Tom. cit. p. 241. B. Addendum to our Knowledge of 
the Carnosa ; tom. cit. p. 450. 
A review of the Order and described species, with addition of a new 
one. The group is divided into Halisarcida and Gumminida. 
6. Duncan, P. M. On some Remarkable Enlargements of the Axial 
Canals of Sponge Spicules and their Causes. J. R. Micr. Soc. (2) i. 
p. 557, pis. vii. & viii. 
