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ARTHUR DBNDY. 
the Sponge dies down in the winter, and that the embryos are 
then released by the decay of the maternal tissues. 
I do not think it advisable at present to enter into any 
speculations with regard to the general significance of the 
development of Stelospongus, but prefer to wait for more 
light on the subject. 
In conclusion, I have to express my cordial thanks to 
Professor Howes, of the Royal School of Mines, for kindly 
undertaking to correct the proof-sheets of this paper in my 
absence from England. 
List of Memoirs referred to. 
(1) Carter. — “Notes on the Species, Structure, and Animality of the 
Freshwater Sponges in the Tanks of Bombay,” ‘ Ann. and Mag. Nat. 
Hist.,’ ser. 2, vol. i, p. 303. 
(2) Carter. — “ A Descriptive Account of the Freshwater Sponges (genus 
Spongilla) in the Island of Bombay, with Observations on their 
Structure and Development,” ‘ Ann. and Mag. Nat. Hist.,’ ser. 2, 
vol. iv, p. 82. 
(3) Carter. — “Notes on the Infusoria of the Island of Bombay,” No. 1, 
“Organisation” (plate vi, fig. 41), ‘Ann. and Mag. Nat. Hist.,’ 
ser. 2, vol. xviii, pp. 115, 221. 
(4) Carter. — “ On the Ultimate Structure of Spongilla, and Additional 
Notes on Freshwater Infusoria,” ‘ Ann. and Mag. Nat. Hist.,’ ser. 2, 
vol. xx, p. 21. 
(5) Carter. — “ On the Nature of the Seed-like Body of Spongilla, &c.,” 
‘Ann. and Mag. Nat. Hist.,’ ser. 4, vol. xiv, p. 97. 
(f>) Carter.— “Descriptions of Sponges from the Neighbourhood of Port 
Philip Heads, South Australia,” continued, ‘Ann. and Mag. Nat. 
Hist.,’ ser. 5, vol. xv, p. 301. 
(7) Carter. — “On the Reproductive Elements of the Spongida,” ‘Ann. 
and Mag. Nat. Hist.,’ ser. 5, vol. xix, p. 350. 
