VEGA-EXFKDITIONENS V ET E N S K A 1' L I O A All BETES. ^99 



P. oriental Grev. (T. M. S. XIV, pa^. 77, PI. VITI, fig. 1). 



P. tesseUdum Grev. (M. J. Vol. VII, pag. 20S, IM. X, fig. 7). 



P. pidcheUum Grev. (M. J. VII, pag. 209, fig. 4—6). 



P. cosfafum Grev. (Ed. N. Phil. Journ. XVIII, 18G3, pag. 35, 

 fig. 5 — G). The structure of the valve consists of numerous, 

 strong, transverse costse and fine stria\ composed of puncta, 

 2 to 3 between each pair of costte. 



Bimero gramma minus Greg. (Diat. of CI. pag. 495, PL X, 

 fig. 35). 



var. nana (Greg.). 



Baphoneis amphiceros Ehr. — In the Labuan material I have 

 seen this species in an almost incredible number of varieties, 

 of which some are described as distinct species, 



a. forma typica PI. 37, fig. 52 a. Van Heurck Syn. PI. 

 XXXVI, fig. 20—23. 



b. var. major Raphoneis lanceolata Ebb.? Length 0,075 

 mm. Breadth 0,o23 mm. Rows of puncta 7 in 0,oi mm. 



c. var. triangidaris. 



d. var. cruciata = xVmphitetras cruciata Jan & Rab. Hond. 

 Diat. pag. 4, PI. I, fig. 5. — Intermediate forms between a. and 

 d. are common in the Labuan material. PI. 37, fig. 52 b. 

 Such an intermediate variety is Raph. amph. var. californica 

 Grun. in Van Heurck Syn. XXXVI, fig. 24. 



e. var. pentagona. PI. 37, fig. 52. c intermediate between 

 d. and e. 



f. var. Casfracanei Grun. (Van Heurck Syn. PI. XXXVI, 

 fig. 28) Labuan. 



li.? hilineata Gr. & CI. — Valve variable in the outline, 

 generally lanceolate. Sculpture strong, parallel costae 7 in 

 0,01 mm., which, according to Grunow, are delicately punctate. 

 The costse are interrupted by strongly marked lines on both 

 sides of the raphe. Length 0,025 — 0,054 mm. Breadth 0,oo8 — 

 0,012 mm. 



forma a. JanceUida Gr. & CI. valve lanceolate — PI. 37, fig. 

 55, b. Labuan, Seychelles (Grun.). 



forma b. protrada CI. valve with protracted ends, median 

 raphe expanded to an area. Length 0,o48. Br. 0,oi2 mm. — PI. 

 37, fig. 55 a. — Labuan, Seychells (Grun.). 



forma c. elUptica Grun. Valve elliptic — Seychells (Grun.) 



forma d. contracta Grun. Valve contracted in the middle. 

 Seychells (Grun.). 



B. macidata CI. N. Sp. — Rhombic or lanceolate, covered 

 with pearl-like puncta, arranged in rows, crossing each other 



