16 40 Proceedings of the Royal Irish Academy. 



Chroocoecus minutus (Kiitz.) Nag. — D, diameter of cells 5-6//. 



var. minimus (V. Keissler) Lemm- C, L, Mw, M ; VL, 2-2-2-5// 

 broad ; D, 2-2'2/z broad. 

 minor (Kiitz.) Nag. — 0, in several localities, 3-0-4-5// broad; M, 3 - 3-4// 



broad, 

 pallidus Nag. — C, L. 



turgidus (Kutz.) Nag. — C, CP; LG, a large form, intensely aeruginose, 

 with cells up to 22'5/t in diameter, sheaths up to 59 x 72// ; W; Cr, 

 average size 18// broad ; S.W. of D, 20-22 broad, with integument 

 34//. 

 Syneehococcus aeruginosus Nag. — C, 17 - 5xll//; IT, W; D, a peculiar 

 subrotund form 24 x 21/t. 



f. ANGUSTIOR f. nov. — F. eellulis relative angustioribus, circiter 

 25 x 10//. C. 

 *crassus Arch. — M; C, 31-32 x '-^0//; W, 42 x 26 - 6/< (incipient division 

 showing) ; B, 35 x 17/<. 



f. crassior Lagerh. — SL, in a small tarn, 38 4-41-6// long, 

 29-38-3 broad, colour almost blue with hardly any trace of green. 

 MINUTUS sp. nov. — S. eellulis singulis, ellipticis, utroque polo rotundatis, 

 circiter 3"3/i latis, lj-plo longioribus. contentu pallide aerugineo et 

 granuloso. Hah.— in paludibus divitibus cum desmidiis, diatomis, 

 et algis aliis. M. 

 'Dactylococcopsis acicularis Lemm. — B, not more than 1-6/u broad. 



*fascicularis Lemm. — CI; C, a variety or form much less contorted, 

 rhaphidioides Hansg. — L, a small form 6x1//; C, 14-15 x 2-5-3/*. 

 Gloeocapsa Magma (Breb.) Kiitz. — CP. 



*muralis Kiitz.— Cr, cells elhpsoid, 4 x 6//, masses brown. 

 *punctata Nag. — 0, cells 0'8-l-6//. 

 *rupestris Kiitz. — L, 6-10// broad without integuments, 

 montana Kiitz. — C, 3*5-5// broad without integuments. 

 Gloeothece confluens Nag. — C, 6-8x3-3-3//; AS, average size 5 x 2-5// ; D, 

 mostly 3-5 x 1-8-2//. 

 linearis Nag. — C, SL. 



forma ANGUSTA f. nova. — F. eellulis 1-1-4 lat. rectis subcurva- 

 tisque. LG. 

 rupestris (Lyngb.) Born. — D. 

 *Aphanocapsa elachista W. & G. S. West. — C, 1 -4-1-5// lat. ; LE, 1-4-1-6//; 

 DL, 1-5-2//, spherical. 

 Grevillei (Hass.) Babenh. — C; CE, 3'3-5//. 

 *testacea Nag.— B, 7'5-8//: C, 8-8 - 5. 



