O’Mrara—Report on the Irish Diatomacee. 395 
under the name of Navicula notabilis, passing into the variety expleta, 
by Schmidt, Atlas der Diat., T. viu., figs. 50, 51 and 52. It seems 
to be perfectly distinct from Navicula notabilis, and deserving of 
being marked by a distinct specific name. 
Stomachs of Ascidians, Roundstone Bay; Stomachs of Ascidians, 
Broadhaven Bay; Arran Islands, Co. Galway. 
Navicula cynthia, (Schmidt). Marine. 
Valves broadly elliptical; ends rounded ; median compartment nar- 
row, linear, slightly incurved at the ends, and slightly constricted in 
the middle compartment at either side, narrow, arcuate, unstriate ; 
marginal striate band broad; striz fine, close, linear, slightly radiate, 
divided into two nearly equal parts by a longitudinal sulcus; length 
-0012, breadth -0007. (Plate 33, fig. 10.) 
Schmidt, Atlas der Diat., T. vi., fig. 41. This figure does not 
indicate the longitudinal suicus which in my specimens divides the mar- 
ginal band of striz into two compartments; still I am disposed to 
regard the present form as at best a variety of the form described by 
Schmidt. 
Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 
Nawicula sansegana, (Grunow). Marine. 
Valve linear, elliptical, ends rounded ; median compartment narrow,. 
linear throughout ; compartments on either side narrow, very slightly 
arcuate, striate ; marginal striate band relatively broad; strie linear, 
sub-distant, parallelin the middle, slightly radiate towards the ends; 
length :0020, breadth -0009. (Plate 33, fig. 11.) 
Schmidt, Atlas der Diat., T. viii., fig. 27, who attributes the spe- 
cies to Grunow, but I cannot find it noticed in any of the many papers 
of that author which I have had the opportunity of consulting. 
Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 
Navicula arraniensis, N.S. Marine. 
Valve small, elliptical ; median compartment narrow, slightly con- 
stricted in the middle, slightly incurved at the ends ; compartments at 
either side narrow, arcuate, striate; marginal band of strie narrow; 
strie strongly costate, distant, nearly linear. Length :0012, breadth 
"0006. (Plate 33, fig. 12.) 
Arran Islands, Co. Galway. 
Navicula schmidtii, N.S. Marine. 
Valve broadly elliptical, ends rounded; middle compartment nar- 
row, linear, strongly marked; very slightly constricted in the middle, 
very slightly incurved at the ends; compartments at either side 
R.1I.A. PROC., SER. II., VOL, Il., SCIENCE. 2U 
