Arch. Biol. 
Biol. Cent. 
Bot. Cent. 
Bot. Gaz. 
Bot. Zeit. 
B. M. C. Z. 
C. R. 
Jour. Linn. Bot. 
Jour. Linn. Zool. 
Je be NESS: 
M. M. C. Z. 
Mem. Bost. 
Morph. J. B. 
Neap. Mitth. 
Nature. 
Proce. Am. Acad. 
Proe. Bost. 
Proe. Can. 
Proc. Conn. 
Proc. Phila. 
Proc. R.S. 
Phil. Trans. 
Proce. Z. 8. 
(Ajo dla WG tsk 
Eva Zieis 
Science. 
Torrey Bull. 
Z. w. Z. 
Z. A. 
THE MIcRoscoPE. 275 
—Archive de Biologie. 
—Biologische Centralblatt. 
—Botanische Centralblatt. 
—Botanical Gazette. 
—Botanisches Zeitung. 
—Bulletin of the Museum of Comparative Zoology. 
—Comptes Rendus of the French Academy. 
—Journal of the Linnean Society, Botany. 
—Journal of the Linnean Society—Zoology. 
—Journal of the Royal Microscopical Society. 
—Memoirs of the Museum of Comparative Zoology. 
—Memoirs of the Boston Society of Natural Vie: 
—Morphologesche Jahrbuch. 
—Mittheilungen a, d. zool. Stat. zu Neapel. 
—Proceedings of the American Academy of Arts and 
Sciences. 
—Proceedings of the Boston Society of Natural His- 
tory. 
—Proceedings of the Canadian Institute. 
—Proceedings of the Connecticut Academy of Arts 
and Sciences. 
—Proceedings of the Academy of Natural Sciences 
of Philadelphia. 
—Proceedings of the Royal Society. 
—Philosophical Transactions of the Royal Society. 
—Proceedings of the Zoological Society of London. 
—Quarterly Journal of Microscopical Science. 
—Recueil Zoologique Suisse. 
—Bulletin of the Torrey Botanical Club. 
—Zeitschrift fiir wissenschaftliche Zoologie (Sie- 
bold and Kélliker’s Zeitschrift). 
—Zoologische Anzeiger. 
EmpBryoLocy oF SponeEes.—Professor W. J. Sollas describes 
(Q. J. M. S., xxiv, p. 603, 1884) some of the early stages of 
the development of Halisarca lobularis. The segmentation is 
irregular and a blastula is formed by the migration of the ceils 
to the exterior, a segmentation cavity not normally being 
formed. The gastrulation takes place in a normal manner, but 
it is accompanied by numerous other infoldings of the surface 
so that it is not always easy to decide which-is the true invagi- 
nation. These other folds eventually produce the water-canal 
