and readily seen. Frustules linear in f. v. with rounded 
_ ends. Length .0005; breadth .00015. Striae 42 in .001. — 
"Villerville, France. — 
 Nitzschia Kittoni Smith, nova species. Frustules 
_ linear, valves lanceolate with sharp and slightly constricted 
 apices, marginal punctae very distinct, 16 in .001, and quite 
"prominent in f. v., striae faint. Length .0007 to .OOL; 
breadth .0002. — Caracas. — 
Raphoneis australis Smith, nova species. Frastules 
_ somewhat variable in size, valves cuneate, rounded at the 
larger end, and coarsely monliform striate, striae interrupted 
by a smooth blank space, frustules slightly cuneate in f. v. 
"Length .0005 to .00086; breadth .00022 to .0004. Striae 
out 30 in .001. — Kerguelen. — 
 _Rhizosolenia Eriensis Smith, nova spec. Frustules 
of medium size, 'compressed and somewhat flattened; six 
to twelve times as long as broad; annuli on the dry frus- 
les conspicuous, altenate, and with a zig-zag median con- 
nection, valves finely striate, bristles nearly or quite as long 
as the frustules, and with the calyptra excentrie, Iying 
nearly in a line with one margin of the frustule when the 
Mat side is in view. Length of frustules .003 to .006. — 
Buffalo, Lake Erie, Lake Michigan ete. 
Cestodiscus Baileyi Smith, nova spec. Disc eir- 
cular, diam. .0025 to .0028, inflated, and with distinct ra- 
diating granules; and showing more or less the charakteristie 
subulate blank spaces of Actinoeyclus; without umbilieus; 
processes intra-marginal, small, and numerous; the punetae® 
near the margin of the valve are in parallel rows, 27 in 
001. Secondary plate or septum, with a large central 
pening, fringed with somewhat irregular rays, which do 
reach the margin. — Oregon. — 2 
_Amphora mucronata Smith, nova spec. Frustules 
‚in f. v. broadly oval, dorsum with distant longitudinal lines, 
ventral surface with indistinet longitudinal lines, or fur 
rows, central nodule elongated and pointed (mucronate), 
and touching the margin of the connecting zone, which is 
‚of variable breadth, nodules at the end quite small. Median 
line strongly and sharply inflectted and minutely punetate 
‚along its whole length, an irregular row of minute lines 0 
longated dots on the valve within the margin. In s. 
very convex; ventral margin straight, or nearly 80, 
