264 Proceedings ‘of the Royal Irish Academy. 
(d). Cellules radiate at the margin, linear in the central portion. 
Coscinodiscus fimbriatus, (Ehr.) Marine. 
Cellules hexagonal; small; in the central portion of the disk 
arranged in lines crossing in quincunx; towards the margin radiate ; 
smaller towards the margin. 
Ehr. Mic. Ralfs, in Pritch., p. 829. 
Stomachs of Ascidians, County Clare. 
(e.) Cellules arranged variously. 
Coscinodiscus marginatus, (Ehr.) Marine. 
Cellules large, hexagonal, arranged in irregularly curved lines, 
with a distinct narrow strongly costate margin. 
Ehr. Mic. Ralfs, in Pritch., p. 829. Weisse, Recherches Micro- 
scopique sur le Guano, Bul. de Academie Imp. de St. Petersburg, 
‘A exii., i 122) Pb ashe. 20" 
Stomachs of Ascidians, Roundstone Bay. Arran Islands. Stomachs 
of Ascidians, Broadhayen Bay, Co. Galway. 
Coscinodiscus lineatus, (Ehr.) Marine. 
Cellules rounded, arranged in oblique, parallel lines. 
Ehrenberg, in his Microgeologie, gives several figures under this 
name. One of them, T. xxu.., fig. 6 a.b., seems scarcely assignable to 
the genus Coscinodiscus, inasmuch as it is furnished with a marginal 
circlet of nodules. Besides this there are two other forms, quite dis- 
tinct: one in which the striz are linear, to be immediately described ; 
the other, the present form, which is furnished with cellules as 
described above. 
Bhr. Mae. Kutz. Bac:,.p. tol; Ta, ne. 0. Ralie, in Praten,, 
p. 830. 
Malahide. Monkstown. Dredgings in Bay, Co. Dublin. Sea- 
weeds, Wicklow. Breaches near Newcastle, Co. Wicklow. Bannow, 
Co. Wexford. Stomachs of Ascidians, Co. Clare. Stomachs of Asci- 
dians, Roundstone Bay, Arran Islands, Co. Galway. 
Coscinodiscus Ehrenbergii, N.S. Marine. 
Disk striate. Strie linear, in two series, crossing each other 
obliquely. (Pl. 26, fig. 24.) 
This is the form described by Ehrenberg as Cos. Lineatus, Mic., 
-xxxy,, A. 17; fie. 75 Woooxy, A. 16, fe 3: .. Wieisse, bulge 
l Academie de St. Petersburg, Tom. xii, Pl. 1., fig. 20 a. 
Malahide. Piles of wooden bridge, Dollymount, Co. Dublin. 
Stomachs of Ascidians, Roundstone Bay, Co. Galway. 
