KONGL. SV. VET, AKADEMIENH HANDLINGAR. BAND. 18. >l:0 5. 21 



Melosira Ag. 



1. Melonra (Podosira?) tuberculosa Cl. N. Sp. 



■ Frustule perfectly sphasrical, 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 strias, 

 20 in 0,01 mm., crossing each other at an angle of 60°. 

 Diam. 0,05 mm. 



Pl. V, fig. 65, ««7.. 

 Gallapagos Islands rare (Eugenie Exp.). 



Stictodiscus Grev. 



1. Stictodiscus Novarce Cl. 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. V, fig. 66, "%• 



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 Crozieri Kitton 

 (Micr. Journ. 1873, Pl. 38, fig. 2) but on comparing my specimen with a specimen of 

 S. Crozieri, I found too great a difference. The puncta are much larger and the ra- 

 diate lines not so numerous as in S. Crozieri. Besides the margin in striate. 



'ö-' 



Stephanodiscus Ehb. 



1. Stephanodiscus (Jbellus A. Schm. var.?) Novce Zeelandice Cl. 



This beautiful little disc has about 20 radiate costa3, 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 costa3. 



Diam. 0,02—0,03 mm. 



New Zeeland, fresh or very slightly brackish water, Rotorua Lake, in some 

 samples communicated by Dr. S. Berggren. 

 Pl. V, fig. 62, "°7i. 



The Cyclotella hella A. Schm. Nordsee Diat. p. 94, Pl. 3, fig. 39 is a small marins 

 species, which seems to correspond in all essential characters with the New Zeeland 

 specimens. 



