4 P. T. CLEVE, ON SOME NEW DIATOMS. 
2. Mastogloia submarginata Cu. et Grun. N. Sp. 
Elliptic lanceolate, ends neither produced nor capitate. Marginal loculi very in- 
distinct, 5—8 in 0,01 mm. Strize punctate, 18—20 in 0,01 mm., most strongly marked 
near the margin and on both sides of the median line, so that they seem to be inter- 
rupted by a more or less large lunate area. The stria continue across this area, but 
are very faintly marked, and can only be discovered with good objectives. 
Length 0,04—0,048 mm. Breadth 0,013—0,017 mm. 
Gallapagos Islands (Eugenie Exp.), Campéche Bay (accord. to Grunow). 
| ie ao aa 
The specimens from Gallapagos Islands have 18 stria and 8 canaliculi in 0,01 mm., 
specimens from Campéche Bay, according to Grunow, 20 strie and 5—7 canaliculi. In 
its very indistinct canaliculi and the interrupted strie this species comes nearest to 
N. Jelineckit Grun. 
Amphora Exs. 
1. A. Berggrenti Cu. N. Sp. 
Median band not complex, central nodule not transversely dilated. The frustule 
is elongated with broad and rounded ends and almost parallel sides; its form being 
like that of A. arenaria Donx. The valve is striate, dorsal strie almost parallel, more 
distant in the middle (17 in 0,01 mm.) than near the ends (20 in 0,01 mm.); ventral 
striew irregular, divergent, especially near the terminal nodules. Terminal nodules con- 
spicuous and seem to project into the frustule. 
Length of the frustule 0,065 mm. Breadth 0,025 mm. 
Fossil, Arthurs Pass, New Zeeland, mixed with freshwater species, such as Navi- 
cula serians, N. rhomboides, N. cuspidata etc. S. BerGGren. 
Pl. I, fig. 3, *°°°/,; a. valve, 6. frustle. 
A freshwater species of Amphora having this appearance is very remarkable. I 
have issued this species in Cx. et Mézx. Diat. N:o 90. 
Cymbella Ac. 
1. Cymbella Brasiliana Cu. N. Sp. 
Almost symmetrical, naviculoid (a faint obliquity being percebtible only on large 
specimens), lanceolate with somewhat obtuse apices. Median line straight. Strie ra- 
diant, near the apices almost parallel, covering the whole surface, except a narrow 
(larger near the central nodule), area round the median line. The central strie are 
stronger and more marked than the others. All the stris are punctate, the puncta 
forming wawy longitudinal lines. Strie 22 in 0,01 mm. on the part between the 
middle and the ends. 
