1886.] POSITION AND CLASSIFICATION OF SPONGES. 639 



1202. Potts, E. Our Fresliwater Sponges. Am. Nat. vol. xvii. pp. 1293- 



1290 (1883). 



1203. . Freshwater Sponges ; what,, where, when, and who wants them. 



Bull. U. S. Fi.«h. 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 the form of Sponge-spicules. P. 



Ac. Philad. 1884, pp. 184-185 (1884). 



1206. . On the vride 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.) Aim. M. N. H. ser. 5, vol. xiii. p. 486 (1884). 



1208. . A new Freshwater Sponge from Nova Scotia {Heteromeyenia 



picfonensis). P. Ac. Philad. 1885, pp. 28-29 (1885). 



1209. . On the 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. S. Micr. Soc. vol. v. p. 76 (1885). 



1212. . A new Freshwater Sponge from Nova Scotia {Heteromeyenia 



picfonensis). Ann. M. N. H. ser. 5, vol. xv. pp. 425-426 (1885). 



1213. . A Freshwater Sponge from Mexico {Mcyenia mexicana). Am.. 



Nat. vol. xix. pp. 810-811 (1885). 



[1214.] . New Freshwater Sponge (Heteromeyenia pictonensis). (Abstr.) 



J. JR. Micr. Soc. ser. 2, vol. v. p. 817 (1885). 

 1215. . Freshwater Sponges from Mexico. Proc. U. 8. Nat. Mw. 1885, 



p. 587 (1885). 



1216. . Freshwater Sponges from Mexico. Ann. M. N. H. ser. 5, vol. xvii. 



p. 170 (1886). 



1217. . Freshwater Sponges from Newfoundland ; a new Species. Aiin. 



M. N. H. ser. 5, vol. xviii. p. 243 (1886). 



[1218.] . Freshwater Sponges from Mexico. (Abstr.) J. R. Micr. Soc. 



vol. vi. p. 82 (1886). 



1219. . Freshwater Sponges from Newfoundland. P. Ac. Philad. 1886, 



pp. 227-230 (1886). 



1220. Pourtales, de. Eeport on the dredging operations of the U.S. Coast 

 Survey. Bull. 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. Quelc. Club, vol. vi. pp. 229-238 (1881). 



1223. . Further Eemarks on the Histology of Sponges. J. Quel-. Club, 



vol. vi. pp. 269-271 (1881). 



1224. . On an undeseribed species of Sponge of the genus Polymastia 



(P. biclavata). J. Quek. Club, vol. vi. pp. 302-304 (1881). 



1225. . On Statoblasts of the Freshwater Sponges. J. Quelc. Club, vol. i. 



pp. 173-181 (1883). 

 1226. . Statoblasts of the Freshwater Sponges. Am. Micr. t/'. vol. iv. 



pp. 208-213 (1884). 



1227. . On the Hexactiuellida;. J. Quek. Club, ser. 2, vol. ii. p 8 (1884). 



1228. Pusch, G. G. Palen'a Paleontologie, p. 6 (1837). 



1229 Quenstedt, F. A. DasFlotzgebirgeWiirttembergs. Tiibingen (1843). 



