TEGA-EXPEDITIONENS VET ENSKAPLIO A ABB ET EN. 493- 



A. turgida Greg. (Diat. of Clyde, pag. 510, PI. XII, fig. 63. 

 A. recta Leud. Fortm. Ceyl. pag. 21, PI. I, fig. 14). Length of 

 the frustle 0,024 mm. Br. 0,oi5 mm. Striae 12 in 0,oi mm. 



A. cymbifera Greg. — Length 0,o9 mm. Strise 9 in 0,oi mm. 



A. cymhelloides Grun. (Hedwigia 1867, VI, pag. 24, CI. & 

 M611. Diat. No 147). 



A. Javanica A. Schm. (Atl. XXVII, fig 27). 



A. Proteus Greg. (Diat. of Clyde pag. 518, PI. XIII, fig. 81). 



var. rolusta Greg. (A. robusta A. Schm. Atl. PI. XXVII, 

 fig. 39— 41). 



var. mexicana A. Schm. (A. mexicana A. Schm. Atl. PI. 

 XXVII, fig. 47—48). 



A. oUusa Greg. (A. Schm. Atl. PI. XL, fig. 16—17). 



A. furcata Leuduger Fortm. (Diat. de Ceylon pag. 20, PI. 

 I, fig. 11. A. spectabilis A. Schm. Atl. PL XL, fig. 20—23). 



A. labuensis CI. N. Sp. — Frustle rectangular, with straight 

 margins. Median lines straight. Central nodule small, not 

 transversely dilated. Connecting membrane without longitu- 

 dinal lines. Strise very coarse and distant, 6 in 0,oi mm.; pa- 

 rallel, with very fine transverse striation. Length 0,o6 mm. 

 Breadth 0,02 mm. — PI. 35, fig. 1 a Fr. V. fig. b. S. V. 



This species, which has the outline of A. Donkinii Rab = 

 A. lineata Donk. is remarkable for its very coarse strise. Mr. 

 Grunow informs me that he has seeu the same species in a 

 gathering from the Adriatic Sea. 



Stauroneis australis Grev. (Ed. N. Phil. J. Vol. XVIII, pag. 

 187, fig. 13, 1863 H. Stauroneis Uformis Grun. Verh. 1863, pag. 

 154, PI. 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 distinct from the latter genus by having 

 short marginal costse 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 strife in 0,oi mm. Length 0,086 mm. Breadth 

 0,035 mm. 



St. histriata Leuduger Fortm. (Diat. de Ceylon pag. 37, 

 PI. IX, fig. 89). I have seen only a single valve of this spe- 

 cies, which seems to belong to the genus Achnanthes. The 

 strise, 10 in 0,oi mm., are costate and less divergent than in 

 the figure of Mr. Leuduger. Length 0,o57 mm. Breadth O.oos mm. 



