24 P. T. CLEVE, ON SOME NEW DIATOMS. 



2. Triceratium {Hydrosera; Terpsinoe) Javanicum Cl. N. Sp. 



Valve plane, hexagonal, with thret; angles separated from the disc by transverse 

 lines (diaphragras) and alternating with three other angles, which are contigous with 

 the disc. One of the three latter angles has near the apex a small transvere fissure 

 corresponding to the appendages on Hydrosera triquetra Wallich. Structure irre- 

 gular 5 — 7-gonal cells, 4 — 5 in 0,01 mm., absent from the ends of the three first named 

 angles. F. W. Rectangular with longitudinal furrows, corresponding to the sinuses 

 between the angles. 



Diam. 0,075 mm. 



Pl. VI, fig. 75, «"%• 



Java, Batavia in brackish water (Eugenie Exp.). 



This form is so nearly related to Hydrosera triquetra Wallich Micr. Journ. VI, 

 p. 251, Pl. 13, fig. 1'^ — 6, that it perhaps might be more correctly regarded as a mere 

 variety. 



3. Triceratium dubium Btw. 



Micr. Journ. VII, p. 180, Pl. 9, fig. 12 is the triangulär form of T. bicorne Cl. 

 (Bih. t. K. Sv. Vet.-Ak Handl. Pl. 5, fig. 30). 



4. Triceratium Tripos Cl. N. Sp. 



Outline in the S. V. almost orbicular or triangulär with very broad and rounded 

 angles. Processes three near the angles. Structure a somewhat coarse and irregular 

 cellulation of hexagonal cells, about 5 in 0,01 mm. In the F. V. the valve is elevated, 

 sloping regularly from the apex to the margins. The three processes are strong and 

 and project somewhat obliquely. 



Diam. of the valve 0,0525 mm. 

 Pl. VI, fig. 72, '"Vi- 



Gallapagos Islands (Eugenie Exp.). 



5. Triceratium Anderssonii Cl. N. Sp. 



This very rare and exceedingly fine species, of which I have found only one in- 

 complete speciraen, is quadrangular with straight sides and rounded angles, upon which 

 are large truncate processes. The structure consists of branching veins, radiating from the 

 centre to the margins, and of tolerably coarse cellules, about 5 in 0,01 mm., of which 

 two rows fill the space between each pair of lines. 



Greatest diameter 0,09 mm. 

 Pl. VI, fig. 69, ""/,. 



Gallapagos Islands (Eugenie Exp.). 



The structure of this remarkable species, which I have named in honour of the 

 late Prof. N. J. Andersson, is that of a Stictodiscus. 



