492 CLEVE, DIATOMS: 
N. sigmoidea (Ehb.) 
N. intermedia Hantzsch. 
N. Denticula Grun. var. minor, lanceolata, costis abbrevia- 
tis. A very remarkable variety with coste not reaching half- 
way across the valve, 6 in 0,01 mm. and 17 strie in 0,01 mm. 
P1. 37, fig. 68. It is only on the authority of Mr. Grunow 
that I have accepted the determination as-a variety of N. 
Denticula. 
N. Tabellaria Grun. 
Hanteschia amphioxys var. californica Grun. (A. Diat. pag. 103). 
Surirella elegans Ehb. 
S. saxonica Auersw. (A. Schm. Atl. P1. XXIII, fig. 1—2). 
S. linearis W. Sm. (A. Schm. Atl. P1. XXIII, fig. 27—33). 
S. apiceulata W. Sm. (A. Schm. Atl. P1. XXIII, fig. 34—35). 
Cymatopleura Solea (Bréb.) W. Sm. 
Cyclotella comta Ehb. 
Melosira varians i gardh. 
IV. Diatoms from Labuan. 
During the stay of the Vega in Labuan near Borneo Dr. 
Kjellman made some gatherings of marine alge, among which 
was found a number of diatoms, which I have examined. I 
have registered the following forms: 
Amphora ostrearia Bréb. (H. L. Smith Lens II, p. 72, Pl. 
I, fig. 16. — A. Schmidt Atl. P1. XXVI, fig: 23? strige not 
punctate!) This very variable species occurs in many forms, 
described as distinct species, as A. vitrea Ol. A. quadrata Bréb. 
A. elegans Greg. A. membranacea W. Sm. and Roper. 4. 
littoralis Donk. Specimens from Labuan have 12 strie in 0,01 
mm., composed of distinct, separate puncta. Length of the 
valve 0,095 mm. 
var. Porcellus (A. Porcellus Kitton in A. Schm. Atl. PI. 
NXXIX, fig. 15—17. A. nove caledonie Grumn. 1. 'c. PI. XXVI, 
fig. 16 — conf. Grun. Arct. Diat. pag. 25). The variety from 
Labuan has the outline of A. arcuata (A. Schm. Atl. P1. XX VI, 
fig. 27—29) but has much coarser strize, composed of distinct 
puncta, 9 in 0,01 mm. Length 0,06 mm. 
A. Weissflogii A. Schm. (Atl. P1. XXV, fig. 58) Strie 11 in 
0,01 mm. Length 0,075 mm. 
A. Schmidtii Grun. (A. Schm. Atl. XX VIII, fig: 2). 
