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EXPLANATION OF PLATES. 
PLATE I. 
Cladonema mayeri sp. n. 
. Medusa of Cladonema mayeri. X 25. 
. Cladonema mayeri. Aboral view. 
PLATE 2, 
Cladonema mayeri sp. n. 
. Manubrium, much enlarged, showing gastric pouches, oral tentacles and bands 
of markings. 
. Top of bell. Dilations and branching of canals and pattern of white markings. 
Top of abnormal bell, showing eleven canals arising from seven primaries. 
. Mouth and oral tentacles of medusa. is 
. Hydroid stage of C. mayeri, showing two verticils of tentacles, lower set con- 
tracted. 
. Hydroid with tentacles fully extended. Bud in early stage of development upon 
column, showing granular endoderm. 
. Medusa-bud, further developed, with tentacles forming. 
. Medusa-bud with tentacles elongating. Oral view. 
. Medusa bud with tentacles developing. Oral view. 
PEATE 3: 
Campanularia and Aglaura. 
. Campanularia macrotheca, new species. Stalk with nutritive and reproductive 
zooids. X Io0. 
. Empty hydrotheca of C. macrotheca. 
. Aglaura ciliata, new species. Enlarged. 
. Oral lappet of A. ciliata. 
. Manubrium of A. ciliata, sectional view. 
PLATE 4. 
Cassiopea, Polyclonia, Cladonema. 
. Polyclonia frondosa. 
. P. frondosa, oral view. 
. Cassiopea xamachana, Bigelow. 
. C. xamachana. Oral view. 
. Cladonema mayeri sp. n. Side view. X62. Photo. From life, by author. 
. C. Mayeri. Oral view. X62. Photo. From life. 
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