STAURASTRUM. 101 



Alg. S. England, 1897, p. 495 ; Alga-fl. Yorks. 1902, p. 105 ; Alg. N. 

 Ireland, 1902. p. 54 ; Freshw. Alg. Orkneys and Shetlands, 1905, p. 27 ; 

 Kaiser, Algenfl. Traunstein u. Chiemgau, I, 1914, p. 152. 



Cells considerably smaller than in the type, and with 

 much shorter processes ; apex of semicell nearly straight 

 or slightly convex ; end view 3-5-angular. 



Length 14-27 '5 JJL; breadth, including processes, 

 23-25 fx ; breadth of isthmus 4-8 '7 \L. 



ENGLAND.- -Harrop Tarn, Cumberland ! Plankton of 

 Brother's Water, Codale and Easedale Tarns, West- 

 moreland ! Pilmoor, N. Yorks ! Skipwith Common, 

 E. Yorks ! Near Goring, Oxfordshire ! Near Chapel 

 Wood and Bisley Common, Surrey ! New Forest. Hants ! 



WALES. Capel Curig, Snowdon and Llyn Idwal, 

 Carnarvon ! 



SCOTLAND.- -Rhiconich, Sutherland ! Plankton of 

 Loch Bairness, Inverness !, and of Loch Stranabhat, 

 Lewis, Outer Hebrides ! Orkneys ! 



IRELAND.- -Donegal ! Mayo! Galway ! Kerry! 



Geoyr. Distribution. Germany. Galicia in Austria. 

 Norway. Finland. Poland. Ceylon. 



112. Staurastrum paradoxum Meyen. 

 (PL CXLV, figs. 1-5.) 



Staurastrum paradoxum Meyer, Beobacht. niedere Alg. 1828, p. 777, t. 43, 

 f. 37, 38 ; Menegh. Syn. Desm. 1840, p. 227 ; Ralfs in Ann. Mag. Nat. 

 Hist, v. 15, 1845, p. 151, t, 10, f. 2 ; Kiitz. Phyc. generalis, 1843, p. 163 ; 

 Ralfs, Brit. Desm. 1848, p. 138, t, 23, f. 8 ; Arch, in Pritch. Inf. 1861, 

 p. 742 ; Rabenh. Krypt. Flora Sachs. 1863, p. 191 ; Flor. Europ. Alg. 

 1868 p 210; Delp/Spec. Desm. subalp. 1877, p. 56, t. 11, f. 63-65; 

 Kirchn. Alg. Schles. 1878, p. 167 ; Wolle, Desm. U. S. 1884, p. 129, t. 42, 

 f. 36, 37 ; Cooke, Brit, Desm. 1887, p. 171, t. 59, f. 4 ; Nordst. Freshw. 

 Alg. N. Zealand, 1888, p. 38, t, 4, f. 10, 11 ; De Toni, Syll. Alg. 1889, 

 p 1211 ; Turn. Freshw. Alg. E. India, 1893, p. 125, t. 15, f. 4, a, b, d, and 

 e ; Roy & Biss. Scott. Desm. 1893, p. 23 ; West & G. S. West, Alg. S. 

 England, 1897, p. 496 ; Comere, Desm. de France, 1901, p. 157, t. II, 

 f 19 ; West & G. S. West, Alga-fl. Yorks. 1902, p. 106 ; Von Keissler, 

 Plankt. Hallst. Sees, 1903, p. 338 ; West & G. S. West, Scott Freshw. 

 Plankton. 1903, p. 548, t. 18, f. 4, 5 ; Freshw. Alg. Orkneys & ; > 

 1905, p. 27, t, 2, f. 33-35, Ostenf. & Wesenberg-Lund, Fortnightly 

 Expl. Plankt. Icel. Lakes, 1906, p. 1112, t. 25, f. 14 ; W. & G. S. West, 

 Brit, Freshw. Phytopl. 1909, p. 175. 



Micrasterias Staurastrum Kiitz. Syn. Diat, 1834, p. 71. 



Phycastrum paradoxum Kiitz. Phyc. Germ. 1845, p. 138 (in part) ; 

 Alg. 1849, p. 180 (in part). 



Ph. tridens Kiitz. Spec. Alg. 1849, p. 180 (in part). 



