\Q 54 Proceedings of the Royal Irish Academy. 



Tribe Surirelleae. 



Surirella fastuosa Ehrenb. — CXE, 81x50/i, 85 xb%n) K 



var. lata (W. Sm.) V. H.-CB, 82-5 x 34/*; C, 76 x 38p ; CXE, 

 73 x 36^, 68 x 41,1, 77 x 40^. 



Tribe Nitzschieae. 



Hantzschia virgata (Koper) Grim. — L, at mouth of Bunowen Biver, 110 x 13/u, 



valve- view. 

 Nitzschia angularis "W. Sni. var. affinis Grim. — C, 71 x 9^. 

 apiculata (Greg.) Grim. — CB ; CXE, 33-3 x 66/<. 



bilobata W. Sm. var. minor Grun. — ONE, as small as 30 x 13p, girdle- 

 fa ee. 

 *commutata Grun. — CB, 86 x 12'bfi ; CXE, 48/x long, 

 fasciculata Grim. — L, 76ju long, 

 •communis Kabenh., var. abbreviate, Grim.— C. 



constricta (Greg.) Grun. — CXE, 45 x 14k, width of constriction ll'Sju, 

 other gatherings 4T7 x 14-2ju, width of constriction 12 - 5^, 48 x 152/j, 

 at constriction 13^. 

 **lorenziana Grun.— CB. 



var. incurva Grun. — CB. 

 plana W. Sm.-CXE, 135 x 17 M . 

 punctata ("W. Sm.) Grun. — AS, 24 x 14u: CXE, 30 x 155/*; not at all 



subrostrate, obtuse. Also from brackish water near D. 

 spectabilis (Ehrenb.) Bait's. — CB, up to 420^ long. 

 Tryblionella Hantzsch. var. levidensis ("W. Sm.) V. H.— CB. 



var. littoralis Grim. — CXE, 55/1 long, 25/a broad, 

 'vitraea Norm. var. recta (Hantzsch) V. H. — CB. 



Division III. CRYPTOEAPHIDIEAE. 



Tribe Chaetocereae. 



Sub-tribe Ehizosolenieae. 



Guinardia fiaccida (Castr.) Perag. — CB. 

 Rhizosolenia alata Brightw. var. gracillima (CL) V. H.— M. 

 'imbricata Brightw. var. Shrubsolii (CI.) V. H. — CB. 



setigera Bright.— M. 



stylifonnis Bright.— M, 



