BULLETIN OF THE NATURAL HISTORY SOCIETY. 
233 
MELOSIRA. 
Melosira. Frustules cylindrical, disciform or globose, connected into cylin- 
drical conferva-like filaments, usually embracing many individuals. 
Valves hemispherical or sub-cylindrical, more or less convex. 
M. varians. Kennebecasis, Nerepis, The Wolves. 
M. Borerii. Kennebecasis, Passamaquoddy, Miramichi. 
M. octagona. Kennebecasis. 
M. granu.lata. Kennebecasis. 
M. crenulata. Kennebecasis. 
M. sulcata. Kennebecasis. 
M. nummuloides. Indiantown, Miramichi, Passamaquoddy, St. Martins. 
(Plate I, Fig. 32.) 
M. marina. Passamaquoddy, St. Martins. 
M. subflexilis. Harding’s Pt., St. John River and harbor. 
M. Jurgensii Ag. Biological Station, St. Andrews. 
M. orichalcea Ken. (Plate I, Fig. 33.) 
MERIBION. 
Meridion. Frustules cuneate, united in a spiral filament, attached or free 
Valves elongate, cuneate, with transverse costae. Striated. 
M. intermedium. Harris’s Cove, Ken. (Plate I, Fig. 34.) 
NAVICULA. 
Navicula. Frustules free, oblong, lanceolate or boat like. Valves convex, 
with similar ends, divided by a median line, with nodules at centre or 
extremities, sometimes constricted in the middle or near the ends, or 
with apices produced or beaked. 
N. nobilis Ehr. Kennebecasis, (Plate II, Fig. 1.) 
N. major Ktz. Kennebecasis. 
N. viridis Ktz. Kennebecasis. 
N. peregrina Ktz. Kennebecasis, Passamaquoddy. 
N. Smithii C Ag. var. ovalis. Kennebecasis, Passamaquoddy. 
N. elliptica Kennebecasis. (Plate II, Fig. 4.) 
N. marina Ralfs. Kennebecasis, Passamaquoddy. 
N. maculata Bail. Kennebecasis. (Plate II, Fig. 3.) 
N. permagna Bail Kennebecasis. 
N. roteana ? Grun. Kennebecasis. 
N. minuscula. Kennebecasis, Passamaquoddy. 
N. crabro or didyma. Passamaquoddy. 
N. distans. Passamaquoddy. (Plate II, Fig. 2.) 
