596 THE AMERICAN NATURALIST. 
1884.— Kraepelin, K., Die Deutschen Siisswasserbryozoen, Teil I, Adz. 
Naturw. Verein, Hamburg, X, 1887; Teil II, ġid., XII, 1893. — Braem, F., 
Untersuchungen ueber die Bryozoen des siissen Wassers, B76/. Zool., II, 
1890.— Davenport, C. B., Cristatella: the Origin and Development of the 
Individual in the Colony, Bull. Mus. Comp. Zool., Harvard, XX, 1890, and 
on Urnatella Gracilis, Bul/. Mus. Comp. Zool., Harvard, XXIV, 1893. 
