586 JAMES F. GEMMILL 
ment des Actinies”’, ‘Arch, Zool. expér. et gén.’, sér. iii, t. 3, 
pp. 43-262. 
8. Gemmill, J. F.—‘‘ The Development of the Starfish Solaster 
endeca, Forbes’’, ‘Trans. Zool. Soc. Lond.’, 1912, pp. 1-71. 
9. —— “The Development of the Sea Anemones Metridium dian- 
thus and Adamsia palliata’”, ‘Phil. Trans. Roy. Soc. 
Lond.’, Ser. B, vol. 209, pp. 351-75. 
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London, Van Voorst, 1860. 
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v, London, 1832, pp. 163-4. 
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tolfe de Marseille ’’, ‘ Ann. Sc. Nat.’, sér. vi, t. 10, 1878. 
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niaires sans Polypier ”’, ‘ Arch. Zool. expér. et gén.’, t. 1, 1872. 
MeMurrich, J. P.—‘‘On the Development of the Hexactiniae ”’, 
* Journ. Morph.’, vol. 4, pp. 303-30. 
16. —— ‘ Report on the Actiniaria collected by the Bahama Expedition 
of the State University of Iowa, 1897”, ‘ Bull. Lab. Nat. Hist. 
Univ. Iowa, 1898’ (quoted from Carlgren (3), p. 34). 
17. Masterman, A. T.—“‘The Early Development of Cribrella 
oculata, Forbes, with remarks on Echinoderm Development ”’, 
‘Trans. Roy. Soc. Edin.’, vol. 40, 1902, pp. 373-417. 
18. Scott Eliot, Laurie, and Murdoch.— Fauna, Flora and Geology of the 
Clyde Area’. Glasgow, MacLehose, 1901. (Laurie, p. 367.) 
19. Wilson, H. V.—‘‘ The Development of Manicina areolata”, 
‘Journ. Morph. Boston’, vol. 2, pp. 191-252. 
—_ 
ot 
EXPLANATION OF FIGURES. 
bl.c., blastocoele cavity ; end., endoderm ; g., commencement of gastru- 
lation; n.f., furrows on blastula from which trophenchyme nuclei 
are nipped off; n.t7., these nuclei degenerating within the trophen- 
chyme; st., stomodaeum; ifr., trophenchyme; tr.a., trophenchyme 
within the archenteron; 1-6, the primary ~hexactinian mesenteries 
numbered according to their order of development (see explanation in 
text). 
Fig. 1.—Section of Bolocera egg, 10 hours after fertilization, showing 
five nuclei; all the nuclei are in one hemisphere of the egg. 
Fig. 2.—Section of egg about 18 hours after fertilization, showing the 
characteristic complete segmentation (see p. 579). 
