360 * RECENT RESEARCHES IN THE DIATOMACESR. 
15. Lichen deustus, E. B. t. 2483,— Gyrophora flocculosa, Hffin.— 
Of this there are three specimens in herb. Sowerby, though the fruited 
Pere n from Dr. Swartz is Sent; having no doubt been returned to 
mith. Under the same name there appears from Scot i nd a specimen of 
e proboscidea, which is evidently the Lichen deustus of Lightft. Fl. 
Scot. IL, p. 861. Of Gyrophora arctica there is no specimen, nor is 
this at all likely ever to have been gathered in Devonshire, as T HE 
by Smith. enel of Gyrophora grisea = Lichen murinus, E. B. t 
there is no specimen preserved it herb. Sowerby, though it occurs as 
British in rs Pulteney. 
RECENT RESEARCHES IN THE DIATOMACEA. 
By tHe Rev. EucENE O'Meara, A.M. 
y. 
Nearly related to the Cymbellee are the Amphoree, in which are in- 
cluded the two genera Amphora and Zpithemia. These agree with one 
metrical form of the valves, and in ig usually trapezoid transverse 
section of the cell. sane @ possesses on each valve three distinct 
tion is sometimes aly apparent, Pioen it it possesses sage precisely 
s 
a Cymbella with one portion of the unsymmetrically divided ian neatly 
obsolete. 
In Epithemia the nodules and mediar-line are absent, or io slightly 
observable. "The two forms agree in this feature, namely, t t the single 
endochrome-plate passes over the mediar -line without sneering an 
mode of growth ; 
by the smaller kepr de "to poe ger Alge or other water-plants. 
distinct development of the nodules and mediar line, the presence of 
which has nothing to correspond with it in the lateral structure. 
