TE'I'MKMOKTS. 210 



WALKS. Llyn Bochlwyd and Tvvll Dliu, Carnarvon- 

 shire ! 



SCOTLAND. Common! (Roy fy Bissett). ('mnmon in 

 Outer Hebrides! Orkneys! 



IRELAND. Gal way ! Kerry ! 



(li'oi/r. l)ix/i'il>/ifinii. Germany. Poland. Norway. 

 Sweden. Denmark. 



Tliis variety is strikingly ;i lmml;i Ml in tin- west ;nnl nortli- 

 wi'st of Scotland. The form of tin- cells, which arc broadesl 

 towards the apices, is very characteristic. 



Var. minimum nob. (PI. XXXII, fig. (>.) 



Tetmemorus Brulissonii var. minor West, Alg. W. Ireland, LS92, p. 132 (in 

 part) . 



Cells very small; lateral margins of semicells 

 parallel. 



Length 57 /x ; breadth 15 /z ; breadth of isthmus 11 //,. 

 IRELAND. Near Oughterard, Galway ! 



2. Tetmemorus granulatus (Breb.) Ealfs. 

 (PL XXXII, figs. 7-9.) 



Clostci-inin <jr<tuti.latus Breb. in Cheval. microscop. et usage, Paris, ls;; ( .i, 

 p. 272 ; Breb. in Menegh. Synops. Desin. 1840, p. 230. 



Tetmemorus granulatus Half's, in Ann. Mag. Nat. Hist. 18-14, p. 257, t. s, 

 f. 2; Hass. Brit. Freshw. Alg. 18-45, p. 378, t. 89, f. 6; Rail's, Brit. 

 Desm. 1848, p. 147, t. 24, f. 2 ; 't, 33, f . 1 ; De Bary, Conj. 185N, p. 2SI, etc., 

 t. 5, f. 11; Arch, iii Pritch. Infus. 1861, p. 740; Rabenh. Flor. Europ. 

 Algar. Ill, 18G8, p. 140, f. .55; Kirchn. Alg. Schles. 1S7S, p. 1 15 , Cooke, 

 Brit. Desm. issd, p. Ill, t. 18, f. 8; t. 19, f. 1; Hansg. Prodr. Al-onil. 

 r.r.hm. 1888, p. 189; De Toni, Syll. Alg. 1889, p. 807; West, Alg. N. 

 Yorks. 1889, t. 291, f. 5; West, Al--. W. Ireland, 1892, p. 132; K<>y A 

 liiss. Scott. Desm. 1894, p. 242; Nordst. Index Desm. 1896, p. L35 ; 

 West & G. S. West, Alg. S. England, 1897, p. 483 ; Alga-fl. Yorks. 19ou. 

 p. 59 ; Alg. N. Ireland, 1902, p. 20. 



Pcnium (Tetmemorus) granulatus Kiitz. Spec. Alg. 1849, p. 107. 



Cells fusiform in both front and side views, 5--\l 

 times longer than their diameter, with a slight median 

 constriction; semicells gradually attenuated from the 

 base to the apex; apices rounded, with a median 

 incision of somewhat variable depth, apical angles 

 rounded or subacute; cell-wall finely scrobiculate, 



