New Diatoms from Honduras. Described by A. Grunow. 171 
the Pinnularia, but which I have been unable to see even with a 
power capable of resolving the striation of Amphipleura pellueida 
into rows of dots, and as far as I know no one else has been more 
successful. It is true that the coarse striation of Pinnularia often 
reaches as far as the median line, but these prolongations of the 
costae are very shallow and in most cases quite invisible. In 
corroded valves they are more distinct as well as the granulations 
of the costae which are now and then very evident; but as I 
previously remarked, I have never been able to detect the fine 
striation as represented by Schumann. In oblique sunlight various 
short irregular and fine striae appear, but they are produced by 
diffraction, and which may have induced him to presume a fine 
striation over the whole of the valve, and really exists in many 
diatoms. Further examination with the best objectives would be 
very useful. 
Striatella. 
Striatella Lindigiana Grun. S. articulis subcylindraceis, 
isthmis crassis gelatinosis, dissepimentis alternatim a smnmo ad 
imum incrassatis, membrana connectiva longitudinaliter et transverse 
subtiliter striato punctata, valvis late ovatis vel suborbicularibus, 
linea media ante polos extincta vel obsolete bifida, striis punctatis 
subradiantibus 15-17 in * 01 mm., ad polos tenuioribus 22-23 in 
•01 mm., radiantibus. Longit. valvrn -07- - OS7 mm., latit. 
valvae • 05- ’065 mm. Tab. CXCIV., Fig. 5, a, b, c. 
Not rare in the Honduras gathering, but never seen by me 
from any other locality ; the dots composing the striae are hex- 
agonal when seen with a higher power. 
S. intermedia Grun. S. Lindigianae affinis, dissepimentis 
magis confertis, valvis ovatis vel oblongis, apice vix producto, 
obtuso, linea media interdum undulata, nodulis, terminalibus 
conspicuis, striis punctatis subradiantibus 24-27 in ‘01 mm., 
striis longitudinalibus 28-30 in '01 mm. Longit. valvte *69- 
• 126 mm., latit. valvm • 042- ' 062 mm. Tab. CXCIY., Fig. 6, a, b, c. 
Not rare in the Honduras gathering. 
The median line is sometimes divided into two branches, which 
by reuniting and dividing form 2-4 little oval spaces. 
The structure of S. unipundata resembles an obliquely striated 
Pleurosigma. Oblique striae 18-20 in ’01 mm., transverse striae 
30 in - 01 mm. Not being aware of the existence of any exact 
delineation, I have represented the valve of this species in PI. 
CXCIV., Fig. 7, a, b. 
Climaconeis. 
Climaconeis Lorenziana Grun., ‘ Yerh. Wien zool. hot. 
Gesellsch.,’ 1862, tab. v., fig. 7. G. Frauenfeldii Grun., ‘ Verb. 
Wien zool. bot. Gesellsch.,’ 1862, tab. vii., fig. 2. Climacosphenia 
