60 ROYAL SOCIETY OF CANADA 
incrustatus, Edwardsia sipunculoides, E. farinacea (U.S.F.C., Bay of 
Fundy in 8-90 fathoms), Peachia parasitica (on Cyanea arctica, Bay of 
Fundy), Metridium dianthus, Actinauge Verrilii (U.S.F.C., Bay of 
Fundy in 50-150 fathoms), Cribrina stella, Urticina crassicornis, Stom- 
phia carneola, Bolocera tuediae (U.S.F.C., Bay of Fundy in 50-150 
fathoms), Actinopsis Whiteavesii. Finally Ganong (1885), mentions 
Metridium marginatum as occurring at Craig’s Ledges, Passamaquoddy 
Bay. 
A visit to the Biological Station at St. Andrews, N.B., during the 
summer of 1908, gave me an opportunity for studying the forms occur- 
ring in that locality, and in the present paper I desire to record those 
observed and to discuss their synonomy. 
METRIDIUM SENILE (LINN.) 
This is the most abundant form, occurring in considerable numbers 
both between tide marks and in deeper water. The individuals ob- 
tained in the former situation, as, for instance, on the beacons marking 
the channel into the harbour of St. Andrews, were all young, the larger 
individuals, so far as my observations go, being only obtainable by 
dredging in the deeper water. 
The species has been frequently described and accounts of its 
anatomical characters have been given by Carlgren (1893), and myself 
(1901), under the name Metridium dianthus, so that a further description 
of it is unnecessary here. There are some questions as to the synonomy 
of the species, however, that require discussion, and, first of all, the 
synonomy of Canadian forms which should evidently be assigned to it 
may be considered. 
The American representatives of the species were originally des- 
cribed by Lesueur (1817), as Actinia marginata, the individuals to which 
the name was applied having been obtained in Boston Bay, and to the 
individuals occurring on the eastern coast this name has since been 
generally applied. To the west coast forms the name M. fimbriatum 
was given by Verrill in 1865, but a study of them convinced me (1901), 
that they were identical with the east coast forms, and a comparison of 
the structure of both with that described for the European M. dianthus 
by Carlgren led to the definite identification of all three, a confirmation 
of suggestions that had previously been made by several authors, notably 
by Verrill (1869) and Andres (1883). 
In Stimpson’s list of Actinians occurring at Grand Manan (1853) the 
species is twice recorded. It appears under the name Actinia margi- 
nata Lesueur, and a large example dredged in 50 fathoms, but unfor- 
tunately lost before it could be thoroughly studied, is doubtfully identi- 
fied as A. dianthus Johnston. Probably both identifications are correct 
