VEG A-EXPEDITIONENS VETENSKAPLIGA ARBETEN. 493 
A. turgida Greg. (Diat. of Clyde. pag. 510, P1. XII, fig. 63. 
A. recta Leud. Fortm. Ceyl. pag. 21, Pl. I, fig. 14). Length of 
the frustle 0,024 mm. Br. 0,015 mm. Strie 12 in 0,01 mm. 
Å. cymbifera. Greg. — Length 0,09 mm. Strize 9 in 0,01 mm. 
A. cymbelloides Grun. (Hedwigia 1867, VI, pag. 24, Cl. & 
Möll. Diat. No 147). 
A. Javanica ÅA. Schm. (Atl. XXVII, fig 27). 
A. Proteus Greg. (Diat. of Clyde pag. 518, Pl. XTII, fig. 81). 
var. robusta Greg. (A. robusta A. Schm. NGE DESSA 
fig. 39—41). 
var. mexicamna A. Schm. (A. mexicana A. Schm. Atl. Pl. 
XXVII, fig. 417—48). | 
A. obtusa Greg. (A. Schm. Atl. Pl. XL, fig. 16—17). 
A. fureata Leuduger Fortm. (Diat. de Ceylon pag. 20, Pl. 
I, fig. 11. ÅA. spectabilis A. Schm. Atl. Pl. XL, fig. 20—23). 
A. labuensis Cl. N. Sp. — Frustle rectangular, with straight 
margins. Median lines straight. Central nodule small, not 
transversely dilated. Connecting membrane without longitu- 
dinal lines. Strie very coarse and distant, 6 in 0,01 mm., pa- 
rallel, with very fine transverse striation. Length 0,06 mm. 
Broadtbi0.:0o2 mm. — P1.-035, tg) Ia ER Vi fis bis: Vs 
This species, which has the outline of A. Donkinii Rab = 
A. lineata Donk. is remarkable for its very coarse strie. Mr. 
Grunow informs me that he has seen the same species in a 
gathering from the Adriatic Sea. 
Stauroneis australis Grev. (Ed. N. Phil. J. Vol. XVIII, pag. 
1387, fig. 13, 1863 H. Stauroneis biformis Grun. Verh. 1863, pag. 
154, P1. XIII, fig. 7). This most interesting form, described the 
same year by Grunow and Greville, does not seem to belong 
to the genus Stauroneis, but to a new genus, nearly related 
to Mastogloia and distinet from the latter genus by having 
short marginal coste instead of the loculi. This form occurs 
sparsely in the Labuan material. I have also seen it in a 
gathering from Port Jackson. Mr. Grunow mentions it as an 
inhabitant of the Red Sea. The Labuan specimens have 14— 
15 finely punctate strize in 0,01 mm. Length 0,086 mm. Breadth 
0,035 mm. 
St. bistriata Leuduger Fortm. (Diat. de Ceylon pag. 37, 
P1. IX, fig. 89). I have seen only a single valve of this spe- 
cies, which seems to belong to the genus Achnanthes. The 
strige, 10 in 0,01 mm., are costate and less divergent than in 
the figure of Mr. Leuduger. Length 0,057 mm. Breadth 0,009 mm. 
