Wright — Foraminifera of South Donegal. 181 



Fine examples of this handsome Bulimina are not unfrequent off Killy- 

 begs Harbour. It has also been found off Skye, by Mr. Eobertson, and off the 

 Shetlands, by Mr. Brady. 



Lagena marginata, Walker & Jacob. (PI. viii. figs, 4, 4a.) 



Serpula (Lagena) marginata, Walker & Jacob, 1784. Test. Min. p. 3, pi. 

 1, %, 7. 



Examples similar to "Walker & Jacob's type, having a broad marginal keel 

 of transparent shell substance, are not unfrequent round our coasts. Rare off 

 Killybegs Harbour, seventeen fathoms. 



Lagena marginata var. Orbignyana, Seguenza. (PI. viii. figs, 5, 5a.) 



Fissurina Orbignyana, Seguenza, 1862, Foram, Monotal. Mess. p. 66, pi. 2, 



figs, 25, 26. 

 This well-marked variety, with three keels, is abundant almost everywhere 

 round our coast. It is plentiful in all the Donegal gatherings. 



Lagena costata, Williamson. 



Entosoknia costata, 1858, Rec. For. Gr. Br. p. 9, pi. 1, fig, 18 ; Wright, 

 Proc. Belfast Nat. Field Club— app. 1876-7, pi. 4, figs, 11—14. 



I have remarked that, of all our British Lagena;, this form appears to flourish 

 best off the exposed parts of our coasts. I imagine this must be due to its 

 strong test enabling it to thrive better in rough water than the other more 

 delicately formed species. Frequent off Slieve League. 



Fragments of a long, slender, tapering, arenaceous form, consisting of a 

 number of segments, and having its shell- wall frequently composed of closely- 

 fitting sponge spicula, arranged side by side, are not unfrequent off Slieve 

 League, as well as at other stations round our coast. It is, most probably, a 

 Reophax, but as no perfect example has as yet been obtained, its place among 

 the Foraminifera could not be given with any degree of certainty. 



