372 Proceedings of the Royal Irish Academy. 
Navicula translucida, N.S. Marine. 
Valve lanceolate, transverse strie obvious, costate, radiate; longi- 
tudinal striz, two or three obvious; length, °0020, breadth, -0003. 
(Pl. 31, fig. 41.) 
Stomachs of Ascidians, Co. Clare. 
Navicula papillifera, N. 8. Marine. 
Valve elliptical-lanceolate, ends produced, papilliform; median 
line incurved and expanded towards the central nodule; intermediate 
free space narrow; transverse strie obsolete, longitudinal striz ob- 
vious, numerous; length -0020, breadth -0006. (PI. 31, fig. 42.) 
Stomachs of Ascidians, Roundstone Bay. 
Navicula liburnica, (Grun.) Marine. 
Valve elliptical, lanceolate, transverse stric fine, linear, slightly 
radiate ; longitudinal strive: indistinct, yet with good light noticeable ; 
intermediate free space narrow, lanceolate. (PI. 31, fig. 43.) 
Grunow, Verhand. der K. K. Zool. Bot. Gesell., Band x., 1860, p. 
o4/, 1. 1. fig. 25. “Rab, Hh Hor, Ale. seck. 1.5, 72: 
Stomachs of Ascidians, Co. Clare. Stomachs of Ascidians, Round- 
stone Bay. Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 
Navicula plumbicolor, N.S. . Marine. 
Valve linear, with rounded ends; length, ‘0018; breadth, -0007 ; 
transverse strize very obscure, punctate, radiate, longitudinal sulcus 
sub-marginal ; longitudinal strie more easily observed than the trans- 
verse ; intermediate free space narrow, linear; dry valve of a leaden 
colour. (PL, 31, fig. 44.) 
Stomachs of Ascidians, Broadhaven Bay, Co. Galway. 
Navicula veneta, (Kiitz.) Brackish water. 
Valve minute; length, ‘0010; breadth, -0003; lanceolate, ends 
slightly produced; transverse strive faint, convergent in the middle ; 
longitudinal striz noticeable with good illumination; longitudinal 
free space narrow, linear. (Pl. 31, fig. 45.) 
Kutz. Bac., p. 95, T. xxx., fig. 76.. Donkin GN. He Det Dias 
p. 43, Pl. vi., fig. 138,) rightly observes that the form ‘‘is abun- 
dant in estuaries and harbours between tide marks.” Rab. Sutssw. 
Diat., p. 39, T.*v1., fis: 83:, Ralis,’im Pritch., p. 901. ~sNone omie 
above authors refer to the longitudinal striz, which, however, by 
careful illumination may be easily detected if the valves be dry. 
Mouth of Bray River, Co. Wicklow. Dollymount Strand, Co. 
Dublin. Galway Bay, near town of Galway. 
