COSMAEKTM. 25 



62. Cosmarium connatum Breb. 

 (Plate LXVII, figs. 15-17.) 



Cosmarium connatum Breb. in Ealfs' Brit. Desm. 1848, p. 108, t. 17, f. 10; 

 De Bary, Conj. 1858, p. 41, 72, t. 6, f. 47; Arch, in Pritch. Infus'. 1861^ 

 p. 7: 1 ..-); Eabcnh. Flor. Europ. Alg. Ill, 1868, p. 175 ; Delp. Desm. suK-iln 

 1877, p. 31, t. 9, f. 23-25 ; West, Alg. W. Ireland, 1892, p. 161; Al u -. 

 Engl. Lake Distr. 1892, p. 729; Liitkem. Desm. Attersees, 1893, p. 549; 

 Eoy & Biss. Scott. Desm. 1894, p. 44; Nordst. Index Desm. 1896, p. 7!) 

 West & GT. S. West, Alg. S. England, 1897, p. 492; Alg.-fl. Yorks. 1900, 

 p. 87 ; Alg. N. Ireland, 1902, p. 41 ; Further Contrib. Freshw. Plankton 

 Scott, Lochs, 1905, p. 483. 



Dysphinctium Mencghinianum Nag. Gatt. einz. Alg. 1849, p. 112, t. 6 G, f. 2. 



Dysphinctiwn connatum Eeinsch, Algenfl. Franken, 1867, p. 178 ; Hans-. 

 Prodr. Algenfl. Bohni. 1888, p. 185; De Toni, SyU. Alg. 1889, p. 884; 

 Heimerl, Desm. alp. 1891, p. 594 ; Schmidle, Lappmark Sitsswasseralgen, 

 1898, p. 20. 



Calocylindrus connatus Kirchn. Alg. Schles. 1878, p. 143 ; Wolle Desm 

 U.S. 1884, p. 55, t. 12, f. 9 r not fig. 8] ; Cooke, Brit. Desm. 1887, p. 124, 

 t, 44, f. 2 ; Benn. Freshw. Alg. S. W. Surrey, 1892, p. 11, t. 2, f. 15. 



Calocylindrus connatus a. typicum Klebs, Desm. Ostpreuss. 1879, p. 29. 



Cells large, almost 1^ times longer than broad, 

 moderately constricted, sinus very widely open with 

 an obtuse apex ; semicells transversely subelliptic with 

 a broad base, apex commonly very slightly flattened. 

 Vertical view subcircular, slightly compressed. Cell- 

 wall often somewhat thick, finely scrobiculate, and 

 densely but minutely punctate between the scrobicu- 

 lations. Chloroplasts disposed in relation to two large 

 pyrenoids in each semicell, with numerous, somewhat 

 irregular, and often furcate lobes extending outwards 

 until they become flattened against the inner surface 

 of the cell-wall. 



Zygo spore unknown. 



Length 65-100 /x; breadth 46-74 ^ ; breadth of 

 isthmus 40-50 //, ; thickness 45-56 ^. 



EXGLAXD.- -Borrowdale and Bassenthwaite Water, 

 Cumberland ! Ambleside (Ralfs), Bowness ! (Bissett), 

 Westmoreland. Hawkshead and near Cockley Beck, 

 Lanes. ! Cullingworth and Ilkley, W. Yorks ! Put- 

 tenham and Thursley Commons, Surrey ! Enbridge 

 Lake (Roy) and New Forest ! , Hants. 



WALES.- -Capel Curig, Carnarvonshire ! (Coolie 

 Wills}. Dolgelly, Merioneth (Rolfs). 



