230 
MARINE AND ESTUARINE DIATOMS. 
COCCONEMA. 
Cocconema. Frustules stipitate. Cymbiform. Lateral surface lunate, 
striae divided unequally by a longitudinal line with median and 
terminal nodules. 
C. lanceolatum. Kennebecasis, estuarine. (Plate I, Fig. 16.) 
COSCINODISCUS. 
Coscinodiscus. Frustules often large, simple, discoid, free or adherent. 
Valves or discs flat or convex, cellulate, the cells, which may be large 
or small, closely or loosely aggregated, being arranged either radiately 
or in curving lines, sometimes with a central rosette. 
C. radiatus. (Plate I, Fig. 15.) C. Liniatus. C. Americana. C. Eccentricus. 
C. pellucida. C. griseus. C. marginatus. 
C. oculus iridis. 
The first seven of the above species are from Harris’s or Matthew’s Cove 
on the Kennebecasis. C. radiatus and C. oculus iridis are common in the 
waters of Passamaquoddy Bay and abound in the plankton of the Bay of 
Fundy. 
CYCLOTELLA. 
Cyclotella. Frustules free or adherent, disciform, simple or binately con" 
joined. Valves plane or slightly convex. Striated, striae rayed. 
C. Kutzingiana Thw. Kennebecasis, St. John, (Plate 1, Fig. 14.) 
C. meneghiniana. Kennebecasis. 
C. compta Grun. Passamaquoddy. Kennebecasis. 
CYMATOPLEURA. 
Cymatopleura. Frustules free, oblong or elliptical. Valves undulated. 
Cy. scutellum Rothesay. (Plate I, Fig. 14A.) 
CYMBELLA. 
Cymbella. Free, cymbiform. Valves lunate, striated, with a longitudinal 
line and central and terminal nodules. 
C. ehrenbergii, Kennebecasis. 
C. gastroides, Kennebecasis. (Plate I, Fig. 17.) 
C. lanceolata. Kennebecasis. 
DIATOMA. 
Diatoma. Frustules oblong. Quadrangular. Cohering by their opposite or 
more generally by their alternate angles into zig-zag chains. Valves 
elliptical or linear. (Plate I, Fig. 18.) 
D. tenue Ag. Kennebecasis. 
D. hyemale Lgng. Kennebecasis. 
