38 Dr Greville’s Descriptions of New Genera - 
This exceedingly distinct little species is about the same 
size as A. crucifera of Kitton, and resembles it to a certain 
extent in the internal cruciform arrangement. But in the 
last-named species there are no pseudo-openings, the pro- 
duced rounded angles being simply an extension of the 
internal surface. There is a difference also in the cruciform 
appearance, which in A. crucifera is produced by the position 
and larger size of puncta, similar to those which fill up 
the rest of the space, and which do not cause the line of 
shadow above mentioned. Although the form is exceedingly 
rare, I have seen and examined several specimens, 
AMPHIPRORA, 
Amphiprora eximia, n. sp., Grev.—F ront view elongated, 
oblong, rounded at the ends, deeply constricted at the middle, 
one supplementary wing convex and widely overlapping the 
constriction, a second passing over the nodule where it is 
somewhat constricted, and within the nodule a short clevated 
longitudinal ridge. Length about :0060" (fig. 18). 
Hab.—Curteis Straits, Queensland; in a dredging com- 
municated by Dr Roberts. 
A singularly graceful species. Nothing can be more 
beautiful than the harmony of the various intersecting 
lines. As far as I can make them out, there are two sup- 
plementary wings, the largest very broad, arising at the 
terminal angles of the valve, and with a gentle curve over- 
lapping the constriction so much as to bring the convexity 
of the supplementary wing almost into a line with the 
widest part of the frustule. The second supplementary 
wings (if they be truly wings) also arise from the same 
point, soon curve outwards, and then, becoming constricted | 
at the nodule, have a somewhat lyrate appearance. Lastly, 
there is just within the nodule a little ridge (or abortive 
wing ?) which is parallel to, and follows the curve of the 
second supplementary wing, and disappears at less than 
half way between the nodule and the ends. I have not 
been able to resolve the strie. 
Ampliprora lata, n. sp., Grev.—Front view very broad 
(breadth more than half the length), truncate at the ends, 
| 
a 
