274 Proceedings of the Royal Irish Academy. 
distinctive characteristic being the fact that the processes and spines 
are diagonally situated on the valve. 
Wm. Sm., B.D Vol..ii.,. p. 50,P1. Tx) fig. 384. oper. J. 
M.S., Oct., 1858, p. 17, Pl. ii., fig. 23. Ralfs, in Pritch, p. 846, Pl. 
vi., fig. 8. Heiberg, De Danske Diat, p. 89. Rab. FI. Eur., sect. 1, 
p- 313. 
Salt marsh, Ballysodare, Co. Shgo. Sea-weeds, Malahide, Co. Dub- 
lin. 
Biddulphia aurita, (Lyngbye.) Marine. 
Valves elliptical lanceolate, with the processes at the extremities 
of the longitudinal axis; processes large at the base, rounded off 
towards the fine extremity; the elevated centre of the valves bearing 
three fine and long spines; striation punctate, fine ; puncta observed 
from front view, parallel; connecting zone finely punctate. (Pl. 27, 
fig. 8). 
Smith and Roper attribute this species to De Brébisson; but with 
Ralfs, Heiberg, and Rabenhorst, I consider it should be ascribed to 
Lyngbye, who first described it as Diatoma auritum. 
Wm: Sm:,. B: Ds. Vol. ap. 49, PL xh: dig. 619.5-Repen daa. 
M.S., Oct., 1858, p. 10, Pl.i., fig. 3. Ralfs, in Pritch., p. 849. Hei- 
berg, De Danske Diat., p. 41. Rab. Fl. Eur., sect. 1, p. 311. Cleve, 
Om Svenska och Norska Diat., p. 218.—Denticella aurita, Ehr. Mic., 
T. xxxv., A 23, fig. 7.—Odontella aurita, Kiitz. Bac., p. 137, T. xxix., 
fic. 88. 
Stomachs of Ascidians, Roundstone Bay, Co. Galway. Sea-weeds, 
Ballybrack, Malahide, Dollymount, Howth, Co. Dublin. Rostrevor, 
Co. Down. Tacumshane, Co. Wexford. Laytown, Co. Meath. SBally- 
sodare, Co. Sligo. Dundalk, Co. Louth. 
Biddulphia rhombus, (Ehr.) Marine. 
Valves orbicular-lanceolate ; processes at the extremity of the longi- 
tudinal axis; spines marginal ; central elevation slight ; striation finely 
punctate, seen on front view, parallel; connecting zone finely punc- 
tate. 
Ehrenberg described this form as Zygoceros rhombus; to him, there- 
fore, should it be ascribed, and not to Wm. Smith, as some authors have 
done. 
Wm. Sm., B. D., Vol. ii., p. 49, Pl. 1xi., fig. 320. Roper, Q.J.M.S., 
Oct., 1858, p. 11, Pl. i., fig. 4. Heiberg, De Danske Diat., p. 40. Rab., 
Fl. Eur., sect. 1, p. 811. Cleve, Om Svenska och Norska Diat., 
p. 218.—Zygoceros rhombus, Ehr., Berl. Acad., 1839, p. 156. Kiitz. 
Bac., p. 138. T. xvi., fig. 9. “Ralfs, i Pritch, p. 850. 
Malahide, Baldoyle, Ballybrack, Dollymount, Co. Dublin. 
