270 Rey. Evoens O'Meara, A.M, 
Nitzschia. Hassall. 
»,  bilobataa Wm.Sm.. Newcastle, co. Wicklow. 
» plana. Wm.Sm. . Newcastle, co. Wicklow. 
birostrata. Wm. Sm. . Salt Hill, co. Dublin. 
,,  Closterium. Wm. Sm.. Salt Hill, co. Dublin. 
»  curvula. Wm.Sm. . Lucan, R. Dodder, co. Dublin. 
»  panduriformis. Greg. Portmarnock, salt ditch near town of | 
Wicklow. 
» virgata. Roper, . Malahide, Portmarnock, co. Dublin. 
» hyalina. . Greg. . Malahide, co. Dublin. 
»  palea. Wm. Sm. ~ Kailcool, co. Wicklow. 
» insignis. Greg. .« Dalkey, co. Dublin ; Newcastle, co. 
Wicklow. 
,  thermalis. Grunow,. Killakee, Blackrock, co. Dublin; Kil- 
cool, Powerscourt, co. Wicklow. 
» Hungarica. Grunow, Kingstown, co. Dublin. 
minutissima. Wm.Sm. North Wall, co. Dublin. 
Odontidium. Kiitz. ; 
sinuatum. Wm.Sm. R. Dodder, co. Dublin; Slate Quarry, 
Glenmore, co. Wicklow. 
»  hyemale. Lyngb. . Black Castle, co. Wicklow. 
»  mesodon. Ehr. . Friarstown, Piperstown, co. Dublin ; 
Glencree, Powerscourt, co. Wicklow. 
anomalum. Wm.S8m. Newcastle, co. Wicklow. 
»,  tenue. Kiitz. . Powerscourt, co. Wicklow. 
elegans. Kitz. . Powerscourt, Rathdrum, Black Castle, 
co. Wicklow. 
,? 
Odontodiscus. hr. : 
excentricus. Ehr. . Dollymount, Malahide, Dalkey, Bally- | 
‘ brack, co. Dublin. 
9) 
Orthosira. Thwaites. ; 
,, arenaria. D. Moore, Killakee, co. Dublin; Kilcool, co. 
Wicklow. 
sulcata. . Ehr. . Malahide, Dalkey, co. Dublin; near 
town of Wicklow. 
5  orichalcea. Wm. Sm. Killakee, co. Dublin; Glencree, co. 
Wicklow. 
»  roseana. Rab. » Jullakee, co. Dublin. 
Plagiogramma. Greville, 
5,  Sslaurophorum. Greg. Dollymount Oyster Beds, Malahide, 
co. Dublin. 
Pleurosigma. Wim. Sm. : 
formosum. Wm. Sm. Howth, Malahide, co. Dublin. 
,» decorum. Wm. Sm. Salt Hill, co. Dublin. 
5, speciosum. Wm. Sm. Salt Hill, co. Dublin. 
elongatum. Wm. Sm. Bray, Newcastle, co. Wicklow. 
»  nubeculaa Wm.Sm. Malahide, co. Dublin; Kilcool, co. 
Wicklow. 
