VEGA-EXFEDITIONENS V ET ES S K AP L I G A ARBETEN. 493 



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

 A. recta Lend. Fortm. Ceyl. pag. 21, PL I, fig. 14). Lengtli of 

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



A. cymhifera Greg. — Length 0,09 mm. Strise 9 in 0,oi mm. 



A. cynibelloides Grim. (Hedwigia 1807, VI, pag. 24, CI. & 

 Moll. Diat. No 147). 



A. Jamnica A. Schm. (Atl. XXYII, fig 27). 



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



var. rohusta Greg. (A. robusta A. Schm. Atl. PL XXVII, 

 fig. 39—41). 



var. mexicana A. Schm. {X. mexicana A. Schm. ki\. PL 

 XXVII, fig. 47—48). 



A. oUusa Greg. (A. Schm. Atl. PL XL, fig. IG— 17). 



A. fiircata Leuduger Fortm. (Diat. de Ceylon pag. 20, PL 

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



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

 margins. Median lines straight. Central nodule small, not 

 transversely dilated. Connecting membrane without longitu- 

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

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

 Breadth 0,o2 mm. — PL 35, fig. 1 a Fr. V. fig. b. S. V. 



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

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

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

 gathering from the Adriatic Sea. 



Sfauroneis cmstrcdis Grev. (Ed. N. Phil. J. Vol. XVIII, pag, 

 187, fig. 13, 1863 H. Stauroneis hiformis Grun. Verb. 1863, pag. 

 154, PL 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 b}^ having 

 short marginal cost?e 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 striae in 0,oi mm. Length 0,086 mm. Breadth 

 0,035 mm. 



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

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

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

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

 the figure of Mr. Leuduger. Length 0,057 mm. Breadth 0,oo9 mm. 



