Hydroids of St. Andrews Bay. 257 
riantly, are covered with young mussels, and the bed of 
Zostera on the far side of the Eden has not yet been ex- 
amined. 
ATHECATA. 
Clava multicornis.—The commonest form. Found every- 
where on stones between tide-marks. 
Hydractinia echinata.—Colonies occur on various empty 
shells. 
Coryne vaginata.—On Delesseria sanguinea. 
Syncoryne decipiens.—F rom débris of fishing-nets. 
Eudendrium ramosum.—F rom deep water. 
capillare—On Antennularia ramosa. 
Tubularia indivisa.—F rom deep water. 
coronata.—K rom deep water. 
larynx.—From deep water. 
In addition to such positivesresults, the detached Medusa- 
buds occur with sufficient regularity to make it practically 
certain that the corresponding hydroids are present, and the 
distribution is often sufficiently local to indicate the position 
those should occupy. In March or beginning of April we 
look for Lizzia (Rathkea) octopunctata; in May Hybocodon 
prolifer; in June Syncoryne eximia, Sarsii, and gravata, 
Stauridium productum, Perigonimus repens, Bougainvillia 
fruticosa, LEctopleura Dumortierti; in July Bougainvillia 
ramosa and Syncoryne pulchella. Huphysa aurata, the most 
beautiful of our smaller hydroids, occurs in great numbers 
from the latter end of July till the beginning of September. 
MEDUS&. 
Lizzta octopunctata. April. 
Hybocodon prolifer. May. 
Syncoryne Sarsvi. June. 
eximia. June. 
gravata. June. 
Stauridium productum. June. 
Perigonimus repens. June. 
Bougainvillia fruticosa. June. 
Ectopleura Dumortierti. June. 
Bougainvillia ramosa, July. 
Syncoryne pulchella. July. 
Euphysa aurata. August. 
The Thecaphora are indicated in the following comparative 
list. 
