BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 5 N:O 8. 19 
175. C. mitidus GreG. (Diat. of Clyde pag. 499 PI. 10 fig. 45) 
Virgin Ids., abundant. 
176. Heterostephania Rothit ErB. (M. G. 35 A. 13 B. fig. 4.5. 
PritcH Pl. fig. 85) Virgin Ids. 
177. Hemidiscus cuneiformis WaAriricH. (PritcH. Pl. 6 fig. 14; 
perhaps also Fuodia gibba Bain. in PritocH. Pi. 8 fig. 22) 
Virgin Ids., several specimens. 
Neither of the two fig. in Pritch. agrees perfectly well with 
the West Indian form, which has the same outline as Gonio- 
thecvwum Anaulus Ez. (M. G. Pl. 33, 18 fig. 4) but smaller 
cellution. I have not seen the nodule, characterizing the 
genus Hemidiscus, nor the row of apiculi on the ventral 
margin. — I have seen specimens of the same appearance as 
the West Indian in gatherings from Balearic Islets, Campeche 
Bay, Gallopagos Ids. and in a fossil state from Moron deposit 
near Sevilla. 
Iust as this paper was written Mr. FRrREb. HABIRSHAW 
of New York kindly sent me a beautiful slide with diatoms 
from Barbados. An examination of this slide yielded some 
additional forms, marked with ". The slide contained follo- 
wing forms. 
Navicula Weissflogii A. SCHM. 
"Libellus Grevillet (A6.) Cr. = Schizonema GREV. SM. Navi- 
cula Libellus GREG. 
Pleuwrosigma balticum (EHB.) W. SM. 
<P. marinum DONE. 
P. strigosum W. Sm. 
P. intermedium W. SmM. 
<P. obscurum W. Sw. 
”Amplatrite (Amphiprora GREG.) complexa (GREG.) Diat. of 
Clyde PI Arfig..62. 
"Amphora ostrearia BréB. (H. L. SmitE Lens II 72 Pl. 1 
fig: 161) 
A. bigibba GRUN. 
"A. decussata Grus. (Micr. Journ. 1877 P1. 195 fig. 9) 
"Cocconeis (Orthoneis) binotata GRUS. var. 'Atlantica (Grun. 
u Nova Lör Bla ltfsstll). 
Asterionella Bleakeleyi Grus. (Micr. Journ. 1877 P1. 193 fig. 2). 
