28 
StoddeRj on Diatoiuacece. 
jecting papillse or tubercles^ as may be easily seen in oblique 
examples. The whole group of Actinocycli and Eupodisci 
requires revision, and I believe that Mr. Edwards intends to 
undertake the task. 
We have quite abundant and variable Stauroptera aspera, 
Ehr. = Stauroneis pulchella, W. S. Ehrenberg made a 
sub-genus of those Stauroneis that were striated or marked ; 
but improved instruments having shown that all the Stauro- 
neis are marked,, and none smooth, the sub-genus should be 
cancelled, but the original specific names should stand. 
There are a great many species of other genera, some of 
which will undoubtedly prove to be new ; but these are not 
worked up as yet, or I have not received Mr. Edwards's 
results. There are also several new forms, whose position in 
classification is as yet quite doubtful. 
The Sandwich Island slides in this parcel represent very 
well the character of all the others examined, except perhaps 
in the genera Nitzschia, Amphora, and Campylodiscus, which 
have been found much more abundant in number and species 
than here, some of the species of which will probably prove 
to be new ; spicules of sponges are very abundant. 
On the Zanzibar slides I have seen two specimens of an 
AuliscuSj probably new ; and several of an Isthmian certainly 
so. 
