Marine Diatoms OF 
Amphora costata W. Sm. 
W. Sm. Brit. Diat., Pl. 30, fig. 253. 
It is doubtful if this can be united with A. Erbi Ehr., as De Toni proposes, 
that species being practically a nomen nudum. Found only in a dredging made 
at Station 23. 
Amphora crassa Greg. 
Sch. Atlas, Pl. 28, figs. 31-33. 
The type form was found only at Stations 43b and 43c and was scarce; but 
the variety called punctata by Grunow was more abundant, occurring, plentifully 
at Stations 20b-c, 27s, 43a and 48b. 
Amphora cymbifera Greg. 
Sch. Atlas, Pl. 25, figs. 17-19, 32-34, 36. 
Found in dredgings made at Stations 23, 27s, 41, 43b, and the coarse form 
shown in figure 19 above at Station 41c. 
Amphora egregia A. Sch. 
Sch. Atlas, Pl. 28, figs. 13-15; Pl. 39, figs. 26, 31, misnamed. 
Found only in one dredging, Station 23. 
Amphora excludens Mann, sp. nov. 
Pl. I, fig. 8; also Sch. Atlas Pl. 25, fig. 12, unnamed. 
Valve very narrow, its ventral edge nearly straight but slightly incurved 
at the ends, its dorsal edge not arcuate but half-rhombic, the margin running 
nearly straight from the widest point at the middle to the pointed apices, these 
however curved ventrally like the beak of a bird; markings on dorsal side a 
narrow band of closely set rows of beading, decreasing in width to the apices, 
the rows radially inclined; on the ventral side a much narrower band of un- 
beaded costae, reverse-radially inclined; rhaphe straight, near the ventral side, 
bisecting a wide median hyaline space, the outer ends of the rhaphe curving with 
the beak-like apices. 
Length 0-146 mm.; width 0-018 mm.; 7-7 lines on the dorsal and 8-5 on 
the ventral side in 0-01 mm. 
This delicate species, with its dissimilar markings on the dorsal and ventral 
sides, is less angular in Schmidt’s illustration than in the one made for this 
report; the position of the rhaphe also is slightly different. Found only in a 
dredging made at Station 41, a single specimen. 
Amphora Eulensteinii Grun. 
Sch. Atlas, Pl. 25, figs. 1-3. 
Cleve in Nav. Diat., II, p. 135, includes this under A. angusta Greg., an 
unsatisfactory change. Found at Stations 23 and 43c. i 
Amphora Gourdonii Perag. 
Perag. Antare. Exp. France, Pl. 2, fig. 23. 
Several specimens of this somewhat doubtful species were found at Station 
43a. 
Amphora laevissima Greg. 
Greg. Diat. Clyde, Pl. 12, fig. 72; Sch. Atlas, Pl. 26, figs. 3, 18. 
Hardly to be united with A. laevis Greg., as is done by Cleve in Nav. Diat., 
II, p. 130. Found in one dredging, that made at Station 43d. 
Amphora mexicana A. Sch. 
Sch. Atlas, Pl. 27, fig. 47, also fig. 44, no name. 
The above figure 44 from Spitsbergen should be included here. Found in 
dredging from Stations 43a, 43b, 43¢ and 43g. 
Amphora obtusa Greg. 
Sch. Atlas, Pl. 40, figs. 4-7, 11, 16-17. 
Rather abundant in the dredging made at Station 41. 
