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Show 1867.] DR. J. E. GRAY ON SPONGES. 509 3. CACOSPONGIA, O. Schmidt, Spong. Adriat. 27. Skeleton composed of hard, rather elastic, homogeneous fibres of unequal thickness. 1. CACOSPONGIA MOLLIOR, O. Schmidt, p. 27. B.M. Hab. Adriatic. 2. CACOSPONGIA CAVERNOSA, O. Schmidt, p. 28. B.M. Hab. Adriatic. 4. SIPHONIA, Blainv. Man. Act. p. 536. Sponge polymorphic, with a central apical aperture or cloaca, with large longitudinal and smaller transverse canals ; composed of dense fibres. SIPHONIA TYPUM, Blainv. Man. Act. p. 536, t. 95. f. 1. Hab. Sicily. B.M. ** Fibres of one kind, the more solid axis being surrounded by a softer cortical substancel 5. APLYSINA, 0. Schmidt, Spong. Adriat. p. 25. Sponge fleshy; fibres of one kind, slightly elastic, consisting of a solid axis, surrounded by a softer bark. Aplisia, Nardo, not Linn. 1. APLYSINA AEROPHOBA, Nardo; 0. Schmidt, p. 25, t. 3. f. 2. Hab. Adriatic. B.M. 2. APLYSINA CARNOSA, O. Schmidt, p. 26, t. 3. f. 3. Hab. Adriatic. *** Fibres with a central tube. 6. VERONGIA. Sponge irregularly netted; the fibres with a central canal, without spinules. Verongia, Bowerbank, Ann. & Mag. N. II. xvi. p. 400, 1845 ; Brit. Sp. i. p. 209; O. Schmidt, Spong. Adriat. Supp. ii. p. 10. Aplysia, Nardo, 1854. Aplysina, Nardo, 1844, 1862; O. Schmidt, Spong. Adriat. 1. V E R O N G I A FISTULARIS, Bowerb. B. Sp. i. p. 209, t. 13. f. 266. Spongia fistularis, Lamk. 2. V E R O N G I A ZETLANDICA, Bowerb. B. Sp. ii. p. 280. Hab. Zetland. |