4 p. T. CLEVE, ON SOME NEW DIATOMS. 



2. Mastogloia submarginata Cl. et Grun. N. Sp. 



Elliptic lanceolate, ends neither produced nor capitate. Marginal loculi very in- 

 distinct, 5 8 in 0,01 mm. Stria? 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 0,0130,017 mm. 



Gallapagos Islands (Eugenie Exp.), Campeche Bay (accord, to Geunow). 

 PI. I, %. 2, "%. 



The specimens from Gallapagos Islands have 18 stria; and 8 canaliculi in 0,01 mm., 

 specimens from Campeche Bay, according to Grunow, 20 striae and 5 7 canaliculi. In 

 its very indistinct canaliculi and the interi'upted stria? this species comes nearest to 

 N. Jelineckii Grun. 



Amphora Ehb. 



1. A. Berggrenii Cl. 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 Donk. The valve is striate, dorsal stria? almost parallel, more 

 distant in the middle (17 in 0,01 mm.) than near the ends (20 in 0,01 mm.); ventral 

 stria? 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. 

 PI. I, fig. 3, "7i; a. valve, b. frustle. 



A freshwater species of Amphora having this appearance is very remarkable. I 

 have issued this species in Cl. et Moll. Diat. N:o 90. 



Cymbella Ag. 



1. Cymbella Brasiliana Cl. N. Sp. 



Almost symmetrical, naviculoid (a faint obliquity being percebtible only on large 

 specimens), lanceolate with somewhat obtuse apices. Median line straight. Stria? 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 stria; are 

 stronger and more marked than the others. All the stria? are punctate, the puncta 

 forming waAvy longitudinal lines. Stria? 22 in 0,01 mm. on the part between the 

 middle and the ends. 



