KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. I8. n:o 5. 21 
Melosira Ac. 
1. Melosira (Podosira?) tuberculosa Cu. N. Sp. 
Frustule perfectly spherical, with very narrow connecting membrane, which forms 
merely an equatorial line. Valve irregularly covered with scattered tubercules. With 
good lenses the surface between the tubercules is seen to be covered with fine striae, 
20 in 0,01 mm., crossing each other at an angle of 60°. 
Diam. 0,05 mm. 
Pi. V, fig. 65, 4. 
Gallapagos Islands rare (Eugenie Exp.). 
Stictodiscus Grev. 
1. Stictodiscus Novare Cu. N. Sp. 
Disc circular, with irregularly scattered large puncta in the centre. Radiating 
lines few. Between each pair of these lines there are about 6 rows of tolerably large 
puncta. Margin of the disc striate. 
Diam. 0,15 mm. 
Pl. Vtg. 66, 7"), 
Fossil, Nankoori Deposit (Novara Expedition) in a sample communicated by Mr. 
GRUNOW, rare. 
I first supposed this elegant form to be a variety of Stictodiscus Croziert Kirron 
(Micr. Journ. 1873, Pl. 38, fig. 2) but on comparing my specimen with a specimen of 
S. Croziert, I found too great a difference. The puncta are much larger and the ra- 
diate lines not so numerous as in S. Croziert. Besides the margin in striate. 
Stephanodiscus Exs.— 
1. Stephanodiscus (bellus A. Scum. var.?) Nove Zeelandie Ct. 
This beautiful little disc has about 20 radiate coste, bifurcate near the margin, 
where no spines are visible. The whole surface is covered with small puncta, arranged 
in lines, radiating from the irregularly punctate centre. Two such punctate lines fill 
the space between each pair of coste. 
Diam. 0,02—0,03 mm. 
New Zeeland, fresh or very slightly brackish water, Rotorua Lake, in some 
samples communicated by Dr. S. Berceren. 
PL ¥,; ie. 62, °F, 
The Cyclotella bella A. Scum. Nordsee Diat. p. 94, Pl. 3, fig. 839 is a small marine 
species, which seems to correspond in all essential characters with the New Zeeland 
specimens. 
