HYDROIDS OF THE HAWAIIAN ISLANDS, 
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EXPLANATION OF PLATES." 
PLATE I. 
Hydrodendrium gorgonoides Nutting. 
Fig. 1. Part of colony (X 5). 
2. Cross section of stem, showing naked coeno- 
sarc above (X 125). 
3. Hydranth and gonophore (X 25). 
4. Cross section of stem, showing irregular 
lacunae (X 25). 
Fig. 5. Longitudinal section of hydranth (to the 
right), and gonophore (to the left),, 
showing ova in the endoderm ( X 125). 
6. Longitudinal section of male gonophore, 
showing spermary (X 125). 
PLATE II. 
(All figures x 5.) 
Fig. 1. Corydendrium minor Nutting. 
2. Corydendrium corrugatum Nutting. 
3. Balea mirabilis Nutting. 
Fig. 4. Campanularia eloisa Nutting. 
5. Halecium scandens Nutting. 
6. Campanularia eloisa Nutting. 
PLATE III. 
(All figures x 5.) 
Fig. 1. Stegopoma gilberti Nutting. 
2. Stegopoma gracilis Nutting, growing as a 
parasite on Halicornaria. 
3. Stegopoma plumicola Nutting, parasitic on 
Lvtocarpus phoeniceus. 
Fig. 4. ?Cryptolaria operculata Nutting. 
5. ?Opercularella longicauda Nutting. 
6. Lafoea contorta Nutting. Basal part of 
colony to the left, distal part to the right. 
a The photomicrographs were made by the author. The pen drawings were made by Mrs. Elizabeth B. Darrow, after 
camera lucida drawings in pencil by the author. 
