30 CLEVE, VEGETABILISKT PLANKTON. 
Cheaetoceros similis CL. N. sp. Chains of 3 to 5 cel- 
lules, straight, rigid. Foramina small, narrow panduriform. 
Cellules in sagittal view quadrate to rectangular, with a 
small protuberance in the middle of the valvular margin. 
Valves compressed elliptical, with a small central protuberance. 
Dimensions: long. ax. 0.012 to 0.017; sag. ax. 0.011 to 0.015; transv. 
ax. 0.007 mm. Awns rigid, all similar, arising from the mar- 
gin, their basal part very short, their prolongations diverging 
in the sagittal view at an acute, and in the transverse view 
at a right angle. — Endocysts globular, with somewhat un- 
equal valves, covered with short, scattered hairs. 
Marine: West coast of Sweden (February 1896), West 
coast of Scotland (April 1888 E. GROVE). i 
This species has some resemblance to Ch. didymus, but 
is smaller, has smaller foramina, and entirely different en- 
docysts. 
Cheetoceros subtilis CL. N. sp. Chains delicate, of a 
few cellules only. Foramina very narrow or indistincet. Cel- 
lules in sagittal view rectangular, long. ax. 0,011 to 0,017; sag. 
ax. 0.005 mm. Awns filiform, all similar, delicate, diverging 
from the longitudinal axis at an acute angle. 
Brackish: Bornholm (March 1896), Kattegat rare (Fe- 
bruary 1896). 
Chaetoceros Scolopendra CL1. N. sp. Chains multicel- 
lular, Aexible. Foramina narrow linear, much smaller than 
the cellules. Cellules in sagittal view rectangular, in trans- 
verse view broadly elliptical to orbicular. Dimensions: long. 
ax. 0.0; sag. ax. 0.02; transv. ax. 0.01 mm. Awns arising near 
the margin; their basal part short, oblique; their prolonga- 
tions parallel to the transverse axis, and with a spiral of 
short and small hairs. 
Marine: West coast of Sweden (February 1896), Western 
Scotland (April 1888). 
Cheaetoceros teres CL. N. sp Chains multicellular, 
slightly silicious, straight. Foramina very narrow or none. 
Cellules in sagittal view quadrate to rectangular, with flat- 
valves; in transverse view orbicular. Dimensions: long. ax. 
0.03 to 0.1; sag. ax. 0.03; transv. ax. 0.028 mm. Awns of the 
