274 Proceedings of the Royal Irish Academy. 



distinctive cliaracteristic being the fact that the processes and spines^ 

 are diagonally situated on the valve. 



Wm. Sm., B. D., Yol. ii., p. 50, PI. Ixii., fig. 384. Eoper, Q. J. 

 M. S., Oct., 1858, p. 17, PI. ii., fig. 23. Ealfs, in Pritch, p. 846, PI. 

 vi., fig. 8. Heiberg, DeDanske Diat, p. 39. Eab. PI. Eur., sect. 1, 

 p. 313. 



Salt marsh, Ballysodare, Co. Sligo. Sea- weeds, llalahide, 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- 

 thi'ce fine and long spines ; striation punctate, fine ; puncta observed 

 from front view, parallel ; connecting zone finely punctate. (PI. 21 ^ 

 fig. 8ff). 



Smith and Eoper attribute this species to De Brebisson ; but with 

 Ealfs, Heiberg, and Eabenhorst, I consider it should be ascribed to 

 Lyngbye, who first described it as Diatoma auritum. 



Wm. Sm., B.D., Yol. ii., p. 49, PL xlv., fig. 319. Eoper, Q.J. 

 M. S., Oct., 1858, p. 10, PI. i., fig. 3. Ealfs, in Pritch., p. 849. Hei- 

 berg, De Danske Diat., p. 41. Eab. PL 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., 

 fig. 88. 



Stomachs of Ascidians, Eoundstone Bay, Co. Galway. Sea-weeds, 

 Ballybrack, Malahide, Dollymount, Howth, Co. Dublin. Eostrevor,^ 

 Co. Down. Tacumshane, Co. Wexford. Laytown, Co. Meath. Bally- 

 sodai'e, Co. Sligo. Dundalk, Co. Louth. 



Biddulphia rhomlus, (Ehr.) Marine. 



Yalves 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 Zygoccros rhombus; to him, there- 

 fore, should it be ascribed, and not to "NYm. Smith, as some authors have 

 done. 



Wm. Sm., B. D., Yol. ii., p. 49, PL Ixi., fig. 320. Eoper, Q. J. M. S., 

 Oct., 1858, p. 11, PL i., fig. 4. Heiberg, De Danske Diat., p. 40. Eab., 

 El. Eur., sect. 1, p. 311. Cleve, Om Svenska och I^orska Diat., 

 p. 218. — Zygoccros rhombus, Ehr., Berl. Acad., 1839, p. 156. Kiitz. 

 Bac, p. 138. T. xviii., fig. 9. Ealfs, in Pritch, p. 850. 



Malahide, Baldoyle, Ballybrack, Dollymount, Co. Dublin. 



