16 10 Proceedings of the Royal Irish Academy. 



Penium curtum Breb., f. intermedia Wille.—C, 39"5-40-5 x 15'4-16-5^. 

 eueurbitimim Biss. — M, L ; D, 60 x 26-6//. 



f. minor W. & G. S. West.— C, SL, M, D. 

 Cylindrns (Ehrenb.) Breb.— C, 44 x 11-11-5/t, common among 

 Utrieularia minor; D; "W, 35 x llfj, the forms seemed to have 

 smaller granules than usual, the newly formed cell-walls were 

 colourless, another gathering measured 29-42 x 10-6-12//. 

 didymocarpum Lund. — C, 38-39 X 13-13-5/t, also 35 X 14 - 3/i. 

 exiguum West. — Cr, 17 X 6//,. 



f. major W. & G. S. West— S, 44-44-5 x 10-5-10V 

 inconspicuum West. — C. 

 Jenneri Balfs. — D. 

 margaritaceum Balfs. — C. 

 mooreanum Arch. — W. 



minutum (Balfs) Cleve.— W ; S, 133x13%: T), 132x14,/, 152x13-2,/, 

 119x14,/. 



var. tumidum Wille.— D, 100 X 16^. 

 Navicula Br£b. — M, W; C, 48x14,/, a rather long form occurred in 



one place, 74x15,/; L, 46x12-5,/; D, 49x12-6,/. 

 phymatospermum Nordst.— D, 33x15//; M, 30x142,/; CP; C, 



35"5x 17'5^. 

 polymorphum Perty.— S, 55 x 24-2,/ ; D, 50 x 24,/, 60 X 25//. 

 spinospermum Josh. — C, 31x14//, 28-4x12-5,/; S ; 34x15//, also 



26-7 X 134// ; D, 27-32 x 13-14,,. 

 spirostriolatum Bark. — W, LG; D, in several places, a short form 



117 x 23-oju, others averaging 140 x 25,,. 

 truncatum Breb.— W ; S W of D, 39 x 12-5//. 

 Roya Pseudoclosteriom (Boy.) W. & G. S. West— D, 86-1 1 8 x 2-5 -3«. 

 Closterium abruptum West. — C, M ; L, 155 x 15-Sju ; Cr, 158 x 15//, a little more 

 curved than type. Some forms from Clare Island were a little 

 longer than the type with narrower apices, average size 184 x 15//. 

 acerosum (Schrank) Ehrenb.— L, 320-323x33-34//, 21° of arc; S.W. of 



I), 507 X 44//, 24° of arc, also 490 X 43-8//, 27° of arc. 

 aciculare T. West, var. subpronum W. & G. S. West,— W, 498 x 6,,. 

 acutum Breb. — W ; C, from several places. 



var. linea (Perty) W. & G. S. West. — W; D, average size 134 x 3*7//. 

 angustatum Kiitz. — W, 386 X 20//. 



var. ASPERTJM, -var. nov. — Var. costis omnibus granulatis, granulis 

 subdistantibus, apicibus cellularum laevissime suhreeurvatis. 

 W, 457x22//. (PI. I, tig. 5.) 



