DESCRIITION OF EPHYDATIA BLEMBINGIA. 103 



in the scleroblasts, both in the sponge tissue and in the gem- 

 mule coat, disposes of the necessity of such a supposition. It 

 seems that it may be considered as finally established that the 

 amphidiscs are carried to their ultimate jDOsition by the sclero- 

 blasts which secrete them. 



In conclusion I wish to otfer my sincerest thanks to Pro- 

 fessor Weldon for the free use of liis laboratory and all its 

 resources^ as well as for much invaluable assistance in relation 

 to the literature of the subject ; to Professor Minchin for 

 reading the proof sheets ; to the Government Grant Com- 

 mittee of the Eoyal Society for their kind and timely assist- 

 ance ; and to the Principal and Fellows of Jesus College, 

 Oxford, for further help. 



TiiE Department of Compakative Anatomy, 

 The Museum, Oxford. 



V. Bibliography. 



1. Bourne, G. C — " On the Stiuctuie and AfiQnities of Heliopora 



ccerulea, Pallas, willi sonic Observations on the Structure of Xcnia 

 and Heteroxenia," 'Phil. Trans. Roy. Soc. Lond.,' vol. clxxs.vi (1895), 

 B, ])p. 455—483, Plates 10—13. 



2. Carter, H. J. — "A Descriptive Account of the Fresh-water Sponges 



(genus Spongilla) in tiie Island of Bombay, with Observations on the 

 Structure and Development," 'Ann. Mag. Nat. Hist.' (2), vol. iv, 

 pp. 81—100, Plates 3—5. 



3. Carter, H. J. — "On the Ultimate Structure of Spongilla and Additional 



Notes on Eresli-water Infusoria," 'Ann. Mag. Nat. Hist.' (2), vol. xx, 

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4. Carter, H, J. — "On ihe Identity in Structure and Composition of the 



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5. Carter, H. J. — "Development of the Marine Sponges from the Earliest 



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6. Carter, H. J.— "On the Nature of the Seed-like body of Spongilla, on 



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