698 E. KFRKPATEICK. 



7. Kirkpatrick R.— ' Ann. Mag. Nat. Hist.,' 1908 (8). ii, p. 503, pi. xv, 



fig. 14. 



8. ' Ann. Mag. Nat. Hist.," 1908 (8), ii, p. 509. 



9. Spencer, Herbert. — " Weismannism Once More." 'Contemporary 

 Review,' reprint, 1894, p. 7. 



10. Nickles. J. M., and Bassler, Ray S. — ' A Synopsis of American 



Fossil Bryozoa,' 1900, p. 28. 



11. Lnndbeck, W.— ' The Danish Ingolf-Exp. VI, i, Porifera (1),' 1902, 



p. 82. 1)1. XV, figs. 7, 8. 



12. Weismann, A. — ' The Evolution Theory," transl. J. A. and M. Thom- 



son, 1904, vol. i, p. 244. 



EXPLANATION OF PLATES 32-38, 



Illustrating Mr. R. Kirkpatrick'.s paper "On Merlia nor- 

 mani : a Sponge with a Siliceous aud Calcareous 

 Skeleton." 



PLATE 32. 



Fig. 1. — Merlia normani. Piece of shell incrusted with three 

 small specimens. Natin-al size. 



Fig. 2. — Specimen on coralline. Natural size. 



Fig. 3. — Specimen on shell, x 3. 



Fig. 4. — Specimen on volcanic block. Natural size. 



Fig. 5. — Specimen, dried and mostly denuded of soft tissues, incrusting 

 Dendrophyllia. Natui'al size. 



Fig. 5a. — Part of same. The larger circular holes are due to presence 

 of worm-tubes. X 5. (See also Text-fig. 3, p. 373). 



Fig. 6. — Macerated and incinerated specimen, x 15. 



Fig. 7. — Part of surface of sponge showing oscule surrounded by 

 a ring of pores, x 50. 



Fig. 8. — Another part of siirface showing irregular distribution of 

 pores. X 50. 



Fig. 9. — Decalcified thick vertical section of sponge showing several 

 storeys of masses of crypt-cells or calcocytes ; sponge much contracted 

 at siu'face. x 50. 



Fig. 10. — Vertical section of well-expanded specimen, a. Suljderaial 

 spaces. 6. Flagellated chaml)ers. c. Crypt-cells or calcocytes. cZ. Long 



