PHYTO-PLANKTON OF BAY OF FUNDY 103 
SESSIONAL PAPER No. 38a 
October 3. Station 9, Off Grand Manan. 
Coscinodiscus eccentricus. 
Chetoceras decipiens. Rare. 
Ditylum, Common. 
Rhizosolenia setigera. Common. 
Thalassionema (7). Very abundant. 
Copepods few. 
October 9. Station 10, St. Andrews Harbour. 
Principally Thalassionema. Abundant. 
Chetoceras decipiens. 
Ditylum. With fringed extremities. Rare. 
Rhizosolenia setigera. 
Copepods few. 
October 27. Station 25, Bay of Fundy, off Digby Gut. 
Chetoceras decipiens. 
Thalassionema. Abundant. 
Conepods, ete. Abundant. 
IJ. NOTES ON THE MORE CHARACTERISTIC GENERA. 
Acnanthes.—Though the species of this genus are usually attached by a stipe. and 
therefore not strictly planktonic, they are still not unfrequently found as isolated 
frustules or small chains in planktonic gatherings. The most common species is 
A. subsessilis, found along with A. longipes in St. John harbour in August, and near 
Grand Manan, also in Passamaquoddy bay and the St. Croix river. The genus is more 
common on the north shore of New Brunswick. 
Actinoptychus.—Like most genera of circular form, this genus is free-floating, 
and though nowhere very abundant, is widely distributed. The only species is 
A. undulatus. It was found in Chance harbour, in January; at the Biological Station, 
February 19, in the reversing Falls, St. John, February 14, near St. Andrews, April 9, 
West Quoddy, June 17, Biological Station, June 28, West Quoddy, August 1. St. 
Martin’s bay, August, Narrows of St. John river, August 10, but was not observed in 
any of the samples of the “ Prince ” collection in September and October. No marked 
differences except as regards these latter months as to relative numbers have been 
observed, either as regards distribution or season. 
Amphiprora—The members of this beautiful genus occur but sparingly in the 
plankton; but owing to their delicacy and transparency, the result of imperfect silicifi- 
cation, are apt to be overlooked... Amphiprora alata, the most common form, was 
found at Eastport, July 29, St. John harbour and St. Martins in August; but was rare 
at both. The very beautiful but rare Amp. ornata was obtained, but one specimen only, 
in the Narrows of the St. John river, August 10. 
Asterionella.—This is a typically planktonic genus, common in the plankton of 
Europe, as well as America, but is very rare in that of New Brunswick. A species, 
doubtfully referred to As. Berkeleyi, has been found in considerable numbers at some 
stations in the Bay of Fundy. 
Biddulphia—This is a very characteristic plankton genus, the attachment of the 
frustule to form chains of considerable length adapting its members readily to flotation. 
