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The awns are transversely striate, strise being 15inO,oi mm.
C. atlanticus Cl. (1. c. Pl. II, fig. 8 a) Greenl. (Davis Strait,
Tindingen), Northern Atlantic.
var. attenuata Grun. (A. Diat. pag. 121. Cl. D. of A. Sea
1. c. fig. 8 b).
var. tumescens Grun. (Van Heurck Syn. Pl. LXXXI, fig. 6).
C.pelagicus Cl. (I). of the A. Sea pag. 11, Pl. I, fig. 4) Northern
Atlantic Ocean.
In some specimens the awns have distant papillse.
C. connivens Grun. (in Cl. & M. Diat. No 118) Northern
Atlantic.
C. Wighami Btw. (M. J. IV, pag. 108, Pl. VII, fig. 19 — 36)
Greenland (Davis Strait), Northern Atlantic Ocean.
forma minuta Grun. (A. Diat. pag. 120, Pl. VII, fig. 134) Kara.
C. borealis Bail. (Smith. Contr. VII, pag. 8, fig. 22—23)
Greenl. (Tindingen), Northern Atlantic, Kara, Cape Wankarema.
var. Brightivellii Cl. (I). of A. S. pag. 12, Pl. II, fig. 7) Davis
Strait, Northern Atlantic Ocean.
C. peruviamis Btw. (M. J. IV, pag. 107, Pl. VII, fig. 16—
18) Davis Strait, Northern Atlantic.
C. Lorenzianus Grun. var. parvula Grun. (A. D. pag. 120,
Pl. VII, fig. 138) Kara.
C. furcellatus Bail? (Grun. A. Diat, pag. 120, Pl. VII, fig.
136) Northern Atlantic Ocean.
This peculiar form is the auxospore of a species nearly
related to C. socialis Laud. (T. M. S. XII, pag. 77, Pl. VIII,
fig. 1).
var. mamillaris Grun. (A. Diat. pag. 120, Pl. ATI, fig. 37) Kara.
G. Tcarianus Grun. (A. Diat. pag. 120, Pl. VII, fig. 135) Kara.
Synclendrium Diadema Ehb. (Btw. M. J. IV, Pl. VIII, fig.
49—52) Northern Atlantic, Cape Wankarema.
Evidently the auxospores of several species of Chastoceros.
Dicladia Mitra Bail. (Sillim. Am. Journ. 1856, pag. 4, Pl.
I, fig. 6. I). grobnlandica Cl. D. of the A. S. pag. 12, Pl. II, fig.
10) Greenl., Kara (Matotschkin Schar), Cape Wankarema.
21. Melosireae.
Asteromphalus Hookeri Grev. var. (A. Brookei Cl. D. of the
A. S. pag. 10, Pl. IV, fig. 19) Greenl. (Davis Strait).
Actinoptychus undulatus Ehb. (A. Schm. Atl. Pl. I, fig. 4)
Cape Wankarema.
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