YJii CONTENTS. 



PA6H 



XVIII —Description and Life-history of a new Fungus, Milowia nivea. 



By G. Massee, F.RM.S. (Plate XII.) Part 6 841 



XIX.— Notes on the Structural Characters of the Spines of 

 Echinoidea. (Cidarida3.) By Prof. F. Jeffrey Bell, M.A., 



Sec. E.M.S. (Plate XIIL) „ 846 



XX.— Kesearches on the Structure of the Cell-walls of Diatoms— 



Eupodiscus. By Dr. J. H. L. Flogel. (Fig. 144) .. .. „ 851 



XXI.— On some Photographs of Broken Diatom Valves, taken by 



Lamplight. By Jacob D. Cox, LL.D., F.E.M.S „ 853 



SUMMAKY OF CuEEENT KeSBAECHES EELATING TO ZoOLOGY AND BOTANY (PEINCI- 

 PALLY InVEETEBEATA AND CeYFTOGAMIA), MiGEOSCOPY, &C., INCLUDING 



Oeiginal Communications peom Fellows and Othees.* 



27, 201, 354, 535, 704, 859 



ZOOLOGY. 



A.— Geneeal, including Embryology and Histology of the Vertebrata. 



PAGE 



Influence of Gravity on Cell-division Parti 27 



Influence of Physico-Chemical Agencies upon the Develop- 

 ment of the Tadpoles of Bana escwlenta . , ,, 29 



Colours of Feathers „ 29 



Budimentary Sight apart from Eyes „ 31 



Commensalisin between a Fish and a Medusa „ 35 



Development of the Optic and Olfactory Organs of Human 



Embryos Part 2 201 



Eggs of Birds „ 203 



Chemical Composition of the Egg and its Envelopes in the 



Common Frog „ 203 



Zoonerythrine and other Animal Pigments „ 204 



Commensalism between a Fish and a Medusa „ 204 



Contributions to the History of the Constitution of the 



Ovum Part 3 354 



Origin of Metameric Segmentation „ 355 



Gastraia Theory „ 357 



Changes of the Generative Products before Cleavage ., ,. „ 357 



Development of Spermatozoa 359 



Human Embryo „ 359 



Placentoid Organ in the Embryo of Birds „ 360 



Development of the Spinal Nerves of Tritons ., ,. ., „ 360 



Poison of Bat rachians ,, 360 



Development of Lacerta agilis „ 361 



Development of Teleostei ' , 362 



Influence of High Pressures on Living Organisms .. . . „ 362 

 On some Appearances in the Blood of Vertebrated Animals 



ivith reference to the Occurrence of Bacteria therein . . Part 4 525 



* In order to make the classification complete, (1) the papers printed in the 

 ' Transactions,' (2) the abstracts of the ' Bibliography,' and (3) the notes printed 

 in the ' Proceedings ' are included here. 



