The Botany of Iceland - 01.12.1916, Qupperneq 19

MARINE DIATOMS FROM THE COASTS OF ICELAND
363
Monoraphideæ
Achnantheæ Cl. 1895. Cl. Syn. II, 163.
Rhoicosphenia Grunow 1860. Cl. Syn., II, 165.
Rhoicosphenia curvata Ktz. Cl. Syn., 11,165; V. H. Trt., Tab. VII,
fig. 319.
143 samples (S. 17, S.W. 74, N.W. 16, N. 27, E. 7, S. L. 2).
Area: Ubiquist, Grl., A. S.
Cocconeis (Ehr. 1835) Grun. 1868. Cl. Syn., II, 168.
Subgenus Cocconeis Cleve 1895. Cl. Syn., II, 168.
Cocconeis grata A. S. Cl. Syn., II, 172; Per. D. mar., Tab. III,
figg. 6—7.
12 samples (S. 1. S.W. 10, N. 1).
Area: Eur., Am.
Cocconeis levis sp. nov. Tab. nost., fig. 11, a, b.
Hypotheca: Long.: 23 p, lat.: 10/t, striis inconspicuis.
Valva elliptica: Raphe ægre perspicienda, area hyalina angu-
stissima cincta.
Epitheca(?): Long.: 16^, lat.: 7 p.
Valva forma Hypothecæ. Raphe deest. Striis in margine modo
difficillime perspiciendis.
Skagafjörður (N.), Grld.
This small species offers very few marks for identification. I think
my fig. b, in spite of its smaller size, may represent the epitheca. Both
valves occur in the same slide. This species somewhat resembles the form
delineated in A. S. Atl., tab. CXCIIl, fig. 2, which Cleve refers to Coc.
placentula.
Cocconeis Scutellum Ehr. var. genuina Cl. Cl. Syn., II, 170;
V. H. Trt., Tab. VIII, fig. 338.
160 samples (S. 18, S.W. 74, N.W. 15, N. 38, E. 15).
Area: Ubiquist, Grl., A. S.
Cocconeis Scutellum Ehr. var. ornata Grun. Cl. Syn.; 1. c., V. H.
Syn., Tab. XXIX, figs. 6—7.
9 samples (S. 1, S.W. 5, N. 3).
Area: Eur., A. S.
Cocconeis Scutellum Ehr. var. parva Grun. Cl. Syn., 1. c., V. H.
Trt., Tab.VIII, fig. 339.
8 samples (S. 2, S.W. 6),
Area: Eur., Am., A. S.
24*