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Show 1886.] POSITION AND CLASSIFICATION OF SPONGES. 639 1202. Potts, E. Our Freshwater Sponges. Am. Nat. vol. xvii. pp. 1293- 1296(1883). 1203. . Freshwater Sponges; what, where, when, and who wants them. Bull. U. S. Fish. Comm. vol. iii. pp. 389-391 (1883). 1204. . Freshwater Sponges as improbable causes of the pollution of river-water. P. Ac. Philad. 1884, p. 28 (1884). 1205. . Some modifications observed in tbe form of Sponge-spicules. P. Ac. Philad. 1884, pp. 184-185 (1884). 1206. . On tbe wide distribution of some American Sponges. P. Ac. Philad. 1884, pp. 215-217 (1884). [1207.] . Freshwater Sponges as improbable causes of the pollution of river-water. (Abstr.) Ann. M. N. H. ser. 5, vol. xiii. p. 486 (1884). 1208. . A new Freshwater Sponge from Nova Scotia (Heteromeyenia pictonensis). P. Ac. Philad. 1885, pp. 28-29 (1885). 1209. . On tbe wide distribution of some American Freshwater Sponges. Ann. M. N H. ser. 5, vol. xv. pp. 20-22 (1885). [1210.] . Modification in the form of Sponge-spicules. (Abstr.) J. B. Micr. Soc. vol. v. pp. 75-76 (1885). [1211.] . On the wide distribution of some American Sponges. (Abstr.) J. B. Micr. Soc. vol. v. p. 76 (1885). 1212. . A new Freshwater Sponge from Nova Scotia (Heteromeyenia pictonensis). Ann. M. N. H. ser. 5, vol. xv. pp. 425-426 (1885). 1213. . A Freshwater Sponge from Mexico (Meyenia mexicana). Am. Nat. vol. xix. pp. 810-811 (1885). [1214.] . New Freshwater Sponge (Heteromeyenia pictonensis). (Abstr.) J. B. Micr. Soc. ser. 2, vol. v. p. 817 (1885). 1215. . Freshwater Sponges from Mexico. Proc. U. S. Nat. Mus. 1885, p. 587 (1885). 1216. . Freshwater Sponges from Mexico. Ann. M. N H. ser. 5, vol. xvii. p. 170 (18S6). 1217. • Freshwater Sponges from Newfoundland; a new Species. Ann. M. N. H. ser. 5, vol. xviii. p. 243 (1886). [1218 ] •• Freshwater Sponges from Mexico. (Abstr.) J. B. Micr. Soc. vol. vi. p. 82 (1886). 1219. . Freshwater Sponges from Newfoundland. P. Ac. Philad. 1886, pp. 227-230 (1886). 1220 Pourtales, de. Report on the dredging operations of the U.S. Coast Survey. Bidl. Mus. C. Z. vol. v. pp. 201-211 (1879). 1221. Price, F. G. H . On the beds between the Gault and Upper Chalk near Folkestone. J. G. Soc. vol. xxxiii. p. 431 (1877). 1222 Priest, B. W . On the Natural History and Histology of Sponges. J. Quek. Club, vol. vi. pp. 229-238 (1881). 12->3 . Further Remarks on tbe Histology of Sponges. J. Quek. Club, vol. vi. pp. 269-271 (1881). 1224. . On an undescribed species of Sponge of the genus Polymastia (P. biclavata). J. Quek. Club, vol. vi. pp. 302-304 (1881). 1225 . On Statoblasts of tbe Freshwater Sponges. J. Quek. Club, vol. i. pp. 173-181 (1883). 1226 . Statoblasts of the Freshwater Sponges. Am. Micr. J. vol. iv. pp. 208-213 (1884). 1227. . On the Hexactinellidae. J. Quek. Club, ser. 2, vol. ii. p. 8 (1884). 1228. Pusch, G. G. Palen's Paleontologie, p. 6 (1837). 1229 Quenstedt, F. A. Das Flotzgebirge Wiirttembergs. Tubingen (1843). |