COSMAEIUM. 21 



Scenedesmus moniliformis Kiitz. Syn. Diat. 1834, p. 607. 



Tessararthra moniliformis Ehrenb. in Abh. der Berlin. Akad. 1835, p. 173 ; 

 Infus. 1838, p. 145, t. 10, f. 20. 



Trochiscia moniliformis Menegh. Conspectus algol. Euganese, etc., 1837, 

 p. 16 ; Menegh. Synops. Desm. 1840, p. 239. 



Cosmarium moniliforme (Turp.) Ealfs, Brit. Desm. 1848, p. 107, t. 17, f . 6 ; 

 Arch, in Frit ch.' Infus. 1861, p. 735 ; Eabenh. Flor. Europ. Alg. Ill, 1868, 

 p. 173 ; Lund. Desm. Suec. 1871, p. 44, t. 3, f. 15 ; Delp. Desm. subalp, 

 1877, p. 10, t. 7, f. 42-45 [not f. 40, 41]; Kirchn. Alg. Schles. 1878, 

 p. 147 ; Wolle, Desm. U.S. 1884, p. 60, t. 15, f. 16-18 [not f. 19] ; Cooke, 

 Brit. Desm. 1887, p. 119, t, 43, f. 2 ; Hansg. Prodi-. Algenfl. Bohm. 1888, 

 p. 193 ; De Toni, Syll. Alg. 1889, p. 932 ; West, Alg. N. Yorks. 1889, 

 p. 293 ; Alg. N. Wales, 1890, p. 291 ; Alg. W. Ireland, 1892, p. 160 ; Alg. 

 Engl. Lake Distr. 1892, p. 729 ; Eoy & Biss. Scott. Desm. 1894, p. 168 ; 

 Nordst. Index Desmid. 1896, p. 174 ; West & G. S. West, Alg. S. England, 

 1897, p. 491 ; Alga-fl. Yorks. 1900, p. 86 ; Alg. N. Ireland, 1902, p. 41 ; 

 Scott, Freshw. Plankton, I, 1903, p. 526: Further Contrib. Freshw. 

 Plankton Scott. Lochs, 1905, p. 484; Comp. Study Plankton Irish 

 Lakes, 1906, p. 85. 



Diplosphgerium moniliforme Cramer in Wartm. et Schenk, Schweiz. Krypt. 

 fasc. 3, no. 136. 



Dijsphinctium moniliforme Eeinsch, Algenfl. Franken, 1867, p. 180. 



Ursinella moniliformis Kuntze, Eevis. gen. plant. 1891, p. 925. 



Cells small, about twice as long as broad, deeply 

 constricted, sinus widely open, but usually acute ; 

 semicells circular or subcircular. Side view of semi- 

 cell circular or subcircular. Vertical view circular. 

 Cell- wall smooth. One axile chloroplast in each semi- 

 cell, with a central pyrenoid and about six radiating 

 vertical plates or lobes (sometimes furcate and more 

 or less irregular). 



Zygospore globose and smooth. 



Length 21-37'5 /x ; breadth 11-20 /x; breadth of 

 isthmus 4-9 JJL ; diam. zygosp. 37 ft. 



ENGLAND. Cumberland! Westmoreland ! W. 1ST. & 

 E. Yorks ! Lancashire ! Surrey ! Sussex ! Devon ! 

 Cornwall ! 



WALES. Snowdon !, Capel Curig ! (Cooke $ Wills}, 

 Moel Siabod !, and Llyn Idwal !, Carnarvonshire. Dol- 

 gelly, Merioneth (Ealfs). 



SCOTLAND. Sutherland ! Ross, Inverness, Aberdeen ! 

 Kincardine, Forfar ! Perth ! Argyll (Roy $ Bissett). 

 Plankton of Sutherland, Inverness, and Outer Hebrides ! 



IEELAND. Donegal! Galway ! Kerry! Dublin and 

 Wicklow (Archer). Plankton of Galway ! 



Geogr. Distribution. France. Germany. Galicia. 



