HYDROZOA. 
Ccel. 9 
135. Whitfield, R. P. assisted by Hovey, E. 0. Catalogue of the types 
and figured specimens in the palaeontological collection of the Geological 
Department, American Museum of Natural History. Bull. Amer. 
Mus. vol. xi, Part ii, 1899. 
Goelenterata , pp. 79-88. 
136. Williams, H. S. On the occurrence of Paleotrochis in Volcanic 
Rocks in Mexico. Amer. J. Sci. vii, pp. 335 & 336. 
See Diller (29). 
137. Wollemann, A. L^eber Korallen aus dem Hilsconglomerat. Jahresber. 
Ver. Braunschweig xi, p. 199. 
138. - & Kloos, J. H. Ueber das Vorkommen von Bryozoen und 
Korallen. [Fossil.] T. c. p. 200. 
II. SUBJECT-INDEX. 
COELENTERATA (collectively). 
General Biology. 
Bipolar Theory ; Goelenterata of Arctic and Antarctic Regions; D’Arcy 
W. Thompson (121). 
Germ-layer theory ; Schultze, L. S. (117). 
Breeding Periods, Lo Bianco (81); C. Aurivillius (7); Thompson 
(122), Vallentin (126). 
Commensalism ; List of forms commensal with Crustacea; Richard 
( 110 ). 
Palceotrochis of volcanic (inorganic) origin ; Williams (136), Diller 
(29). 
Symmetry and Asymmetry ; Reh (108). 
Plankton; Aurivillius (8). 
Collecting in Jamaica; Conant (23), Duerden (32). 
Preservation of Coelentera ; Romer, see Schaudinn & Romer (115). 
Bibliography; Vanhoffen (127), Ward (131), Whitfield & Hovey 
(135). 
Iconography; Haeckel (50). 
HYDROZOA. 
HYDROIDEA 
(including Hydromedusae). 
General Biology. 
Asexual reproduction; Blastolytes produced by fission in Hypolytus 
peregrinus , Murbach (96). 
Development. Pennaria tiarella McC., Hargitt (54) ; Plumularia 
echinulata Lmk, periodicity ; creeping planula, p. 12, Betencourt (12); 
direct development of Limnocnida tanganjikce, Moore (93) ; Eudendrium 
annulatum , Norman, fixation of planula and development of polypite, 
p. 4, pi. 1, fig. 4, Betencourt (12). 
