O’Mrara—Report on the Irish Diatomacee. 247 
Greville, in Hooker’s Brit. Flora,* p. 401. Wm.Sm. B.D., Vol. iz, 
p. 56; Pl. 3., fig. 330. Heiberg, De Danske Diat., p. 28.—M. moni- 
liformis, Kiitz. Bac., p. 53, T. i1., fig. 2. Raben. Fl. Eur., p. 38. 
Ralis, in-Pritch:, p. 817, Plow, fige.71. 
River Slaney, near Killurin, Co. Wexford. Brackish ditch near 
Wexford town. Malahide, Dollymount strand, Howth, Co. Dublin. 
Sea weeds, Giants’ Causeway, Co. Antrim. Brackish ditch near the 
town of Wicklow. R. Nannywater, Laytown, Co. Meath. 
Melosira subflexilis, (Kiitz.) Fresh or brackish water. 
Frustules usually narrow elongate, slightly inflexed upon the 
margin. (Pl. 26, fig. 2.) 
ibe b4c. oe, u., ie To... Wm. Sm,, BD, Vol, i., p. 37; 
Pl. 11., fig. 381. Heiberg, De Danske Diat., p. 28. Rab. Fl. Eur., 
ee 
Considerable diversity of opinion exists as to the habitat of this 
species. According to Kiitzing it belongs to the fresh water forms, 
haying been found by him inrapid brooks. ‘‘In schnell fliessenden 
Bachen.” Bac., p. 54. Still more precisely does Rabenhorst assign 
to it a fresh water habitat. ‘‘ Hab. in rivulis Sporadice per totam 
Europam e planitie usque in regionem montanam superiorem, Fl. Eur., 
p- 89. While Smith gives it either a fresh water or brackish locality, 
Heiberg makes it a marine species. His remarks are worthy of notice. 
“Smith attributes the authorship of this species to Kiitzing, but 
Kiitzing’s figure can hardly be identified with certainty, and seems to 
be more properly referrible to Melosira varians. Kiitzing’s Melosira 
Jurgensii more nearly resembles Smith’s species, and so Pritchard 
accepts it. But Pritchard calls the species Melosira Jurgensii, and 
represents Melosira subflexilis Sm. as a synonym; but in any case 
this ought to be reversed, inasmuch as Smith was the first to define 
the species so that it could be identified with certainty.” ‘Smith 
assigns it to fresh water, but as the localities mentioned are near the 
mouths of rivers, the species possibly has been borne out along with the 
floods.” De Danske Diat., pp. 28, 29. In addition, I have only to say 
that the localities in which the species has been found by me in 
Treland are marine, but still liable to the access of fresh water. 
Lough Foyle, Bellarena, Co. Derry. Greystones, Co. Wicklow. 
Melosira varians, (Agardh.) Fresh water. 
Ends of the frustules not so convex as in the preceding species. 
Kiitz. Bac., p. 54, T. i1., fig. 10. Rab. Die Siissw Diat., p. 13, 
Tu. fie. 40° WimiSm<B.D:) Voll u:, p: 57, Pliar, fig: 332. . Ralts, 
* Forexplanation of contractions and list of references, vide List at end of Report. 
