O'Meara — Report on tlie Irish Diatomacecp. 393 



Brit. Diat., p. 12, PI. ii., fig. 4. And likely the same as that figured 

 hj Schmidt, Atlas der Diat., T. ii., fig. 36. 



Arran Islands ; Stomachs of Ascidians, Eoundstone Bay ; Sto- 

 machs of Ascidians, Broadhaven Bay, Co. Galway. Banno^r, Co. 

 Wexford. Malahide, Portmarnock, Piles of wooden bridge, Dolly- 

 mount strand, Dalkey, Co. Dublin. Bostrevor, Dundrum Bay, Co. 

 Down. Lough Gill, Co. Kerry. 



Var. ahrujjta, (Gregory). Marine. 



Like the last described variety, but the strise are costate, and the 

 intermediate lyrate free space does not extend so near the ends. 



Gregory, Diat. of Clyde, p. 486, PI. ix., fiig. 14. Eab. PL Em-., 

 Alg., sect, i., p. 178. Donkin, N. H. Brit. Diat., p. 13, PI. ii., 

 fig. 6. Gregory and Donkin figure the species with obscurely moni- 

 liform strise ; and therefore I have a d.oubt of the identity of the pre- 

 sent variety with that so described. Supposing the figures referred to 

 be exact in this particular, I could scarcely distinguish between the 

 former and j!^avicula lyra, var. elliptica. 



AiTan Islands ; Stomachs of Ascidians, Boundstone Bay ; Sto- 

 machs of Ascidians, Broadhaven Bay, Co. Galway. 



Var. costata. (O'Meara). Marine. 



Valve broadly elliptical ; marginal band of strise broad ; inner band 

 of strife narrow ; strise distinctly costate, close, parallel in the middle, 

 slightly radiate towards the ends, which latter are slightly cuneate ; 

 intermediate lyrate space very narrow, convergent at the ends, and 

 reaching to the apices; length '0024, breadth '0012. 



Arran Islands ; Stomachs of Ascidians, Broadhaven Bay ; Sto- 

 machs of Ascidians, Boundstone Bay, Co. Galway. 



Var. seductilis. (Griindler). Marine. 



Valve narrow, linear-elliptical ; marginal band of strise relatively 

 wide ; inner band of strise narrow ; strise very fine, linear, parallel in 

 the middle, slightly, radiate towards the ends, Ijrrate smooth space 

 very naiTOw; length about -0020, breadth about -0006. — I^avicula 

 seductilis (Griindl), Schmidt, Atlas der Diat., T. ii., fig. 35. 

 Yokohama. (Plate 33, fig. 5.) 



Stomachs of Ascidians, Eoundstone Bay, Co. Galway. 



Var. constrida, (O'Meara). Marine. 



Valve linear, elliptical, slightly constricted in the middle, ends 

 cuneate, rounded at the extremity ; strise, fine, moniliform, lyrate ; 

 free space naiTow, converging at the ends ; length -0042, greatest 

 breadth -0016, breadth in the middle -0015. (Plate 33, fig. 6.') 



Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 



