Works referred to
- Orton , J. H. 1914 . Preliminary account of a contribution to an evaluation of the Sea . Journ. Mar. Biol. Assoc. Plymouth , x : 312 – 326 .
- Sollas , W. J. 1888 . Report on the Tetractinellida collected by H.M.S. ‘Challenger’ . Challenger Reports , xxv : 437 – 437 .
- Wilson , H. V. 1907 . On some phenomena of coalescence and regeneration in sponges . Journ. Exper. Zool. , v : 245 – 258 .