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2 Spong. 
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Aplysinidce. Z. wiss. Zool. xxxviii. pp. 234-313, pis. x.-xiii. ; 
abstract in J. R. Micr. Soc. (2) iii. p. 519. 
12. Marenzeller, E. v. Propagation of Sponge by Cuttings. Am. 
Nat. xvii. pp. 200-203. 
13. Marshall, W. Uber einige neue von Herrn Pechuel-Loesche aus 
dem Congo gesammelte Kiesel-schwamme. Jen. Z. Nat. xvi. 
(n. f. ix.) p. 553 ; abstract in J. R. Micr. Soc. (2) iv. p. 66. 
14. . Einige vorliiufige Bemerkungen uber die Gemmulae der Suss- 
wasser-schwamme. Zool. Anz. 1883, pp. 630-634 & 648-652. 
15. Merejknosky, C. de. Nouvelles recherches sur la zoonerythrine 
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Zool. xxxix. pp. 295-308, pis. xvi. & xvii. ; abstract in J. R. Micr. 
Soc. (2)iv. pp. 65 & 66, Biol. Centralbl. iii. p. 768, and Am. Nat. 
xviii. p. 85. 
17. Polejaeff, N. Uber das Sperma und die Spermatogenesis bei 
Sycandra raphanus , Haeck. SB. Ak. Wien, lxxxvi. pp. 276-298 
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iii. pp. 180 & 181. 
18. Potts, E. Fresh-water Sponges : what, where, when, and who 
wants them. Bull. U. S. Fish Comm. iii. pp. 389-391. 
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20. Priest, B. W. Statoblasts of the Fresh-water Sponges. J. Quek. 
Club (2) i. pp. 173-181, pi. vii., and Am. Micr. J. iv. pp. 208-213. 
21. Rathbun, R. Sponge Culture in Florida. Science, ii. p. 213. 
22. Ridley, S. O. Notes on Zoophytes and Sponges obtained by Mr. 
F. Day, off the East coast of Scotland. J. L. S. xvii. pp. 106-108. 
23. Retzer, W. Die deutschen Susswasser-schwamme. Inaug. Diss. 
Tubingen, 1883, 8vo, pp. 1-30, pis. i. & ii. 
24. Solger, B. Uber einige der anatomischen Untersuchung zugan- 
gliche Lebensercheinungen der Spongien. Biol. Centralbl. iii. 
pp. 227-235 ; abstract in Kosmos, xiii. pp. 300-302, and J. R. 
Micr. Soc. (2) iii. 
25. Thoulet, J. Sur les spicules siliceux des Sponges vivants. C.R. 
xcviii. pp. 1000 & 1001. 
26. Vejdovsky, F. Revisio Fauna Bohemica. I. Die Siisswasser- 
schwamme Bohmens. Abh. bohm. Ges. (6) xii. ; abstract in J. R. 
Micr. Soc. (2) iii. pp. 858-860. 
27. . Beitrage zur Kenntniss der Susswasser-schwamme. SB. bohm. 
Ges. 1883, pp. 19-31. 
