Spong. 1 
XVII. SPONGLE. 
BY 
Professor E. A. Minchin. 
CONTENTS. 
Page 
Introduction.4 
Corrigenda and Addenda to previous Records ... 5 
I. Titles . 6 
II. Biology. 
a. Evolution. 
(i) General Principles . . 11 
(ii) Relations of Sponges . . . . . . 12 
(iii) Phylogeny (vacant). 
b. Morphology. 
(i) General Accounts . . . . . . 12 
(ii) External Characters . . . . . . 12 
(a) Orientation, Attachment . . . . 12 
(b) Form and Mode of Growth . . . 13 
(c) Colour . . . . . . . 13 
(iii) Anatomy of Soft Parts. Canal-System . . 13 
(iv) Skeletal System . . . . . . . 13 
(a) General Accounts . . . . . 13 
(b) Material of the Skeleton . . . . 13 
(c) Skeletal Elements, Morphology, Develop¬ 
ment, and Nomenclature of . . . 13 
(d) Skeletal Anatomy . . . . . 14 
(v) Histology . . . . . . . 14 
(a) General Accounts . . . . . 14 
(b) Special Organs or Tissues , . . 14 
(vi) The Germ-Layer Question ..... 14 
c. Physiology. 
(i) General Accounts (vacant). 
(ii) Nutrition ........ 14 
(iii) Respiration (vacant). 
(iv) Secretion and Excretion, Pigments, Ferments, etc. 
(v) Irritability, Contractility, etc. (vacant). 
(vi) Individuality. . 15 
(vii) Miscellanea and Experimental (vacant). 
[VOL. XXXIX.] F 3 
1902. 
