214 BRITISH DESMIDIACE^E. 



Biccall Common. E. Yorks ! Epping Forest, Essex f 

 Warwicks ! Worcs ! Near Chapel Wood, and Puttenham 

 Common, Surrey ! Enbridge Lake, Hants., with zygo- 

 spores (Roy}. 



WALES.- -Llyn Idwal, Llyn Ogwen, Llyn Geirionedd, 

 and Llyn Bodgynwydd, Carnarvonshire ! 



SCOTLAND. Sutherland !, Inverness !, Aberdeen, 

 Kincardine, Forfar, Perth ! and Argyle (Roy & Biss,). 

 Not uncommon in the plankton ! Frequent in Lewis, 

 Outer Hebrides ! Shetlands and also in the plankton ! 



IRELAND. Donegal ! Mayo ! Galway ! Kerry t 

 Armagh ! 



Geogr. Distribution.- -Germany. Galicia and Austria. 

 Sweden. Bornholm. N. Eussia. Manchuria. Central 

 China. Japan. Ceylon. Java. Australia. New Zealand. 

 Nova Scotia. United States. Porto Rico. Colombia. 

 Brazil. Paraguay. Patagonia. 



Var. trigranulatum W. & G. S. West. (PL CLX, fig. 8.) 



Sph. granulatum var. trigranulatum AVest & G. S. West, Alg. N. Ireland, 

 1902, p. 59, t, 2, f. 18. 



Cells slightly longer than in the type ; semicells with 

 3 granules only on each side, arranged in a vertical series 

 on the lateral margin. 



Length 10'2-11'3 ;JL ; breadth 10'6 [/. ; thickness 5'8 [i ; 

 breadth of isthmus 5 [JL . 



IRELAND. Gortahork, Donegal ! 



5. Sphaerozosma Wallichii Jacobs. 

 (PI. CLX, fig. 9.) 



Sphcerozosma excavatum /3 Wallich, Desm. Low. Bengal, 1860, p. 192, t. 7, 



f. 15. 

 Sph. Wallichii Jacobs. Desm. Danem. 1875, p. 211 ; ? Wolle, Desm. U. S. 



1884, p. 30, t. 4, f. 15 ; De Toni, Syll. Alg. 1889, p. 794 ; Turn. Alg. E. 



India, 1893, p. 141, t. 18, f. 1, 12, 13 ; Johns. New Rare Desm. 1894, 



p. 286 ; West & G. S. West, Desm. U. S. 1898, p. 320 ; Borge, Alg. erst. 



Regnell. Exped. II, Desm. 1903, p. 121. 



Sph. excavatum [3 Wallichii Nordst. in Pointsf. Skandin. Vaxt. 4, 1880, p. 24. 

 . Eegnesi Schmidt, Grundl. Algenfl. Liineburg. Heide, 1903, p. 21-23, 



t. 1, f. 12. 



