8 P. T. CLEVE, ON SOME NEW DIATOMS. 
N. Hennedyi var. Tahitensis Cu. 
Broadly oval with almost parallel sides. Striw scarcely punctate, marginal 13 in 
0,01 mm., central 15 in 0,01 mm. 
Length 0,05 mm. Breadth 0,023 mm. 
PL. tie, 1, 
Tahiti (Eugenie Exp.). 
This variety is remarkable for its almost smooth striae. 
6. Navicula rudis Cu. N. Sp. 
Broadly oval, with broadly rounded ends. Strie coarse, 6 in 0,01 mm. marginal 
composed of about 5—8 large, separate puncta; central striz composed of 2—3 puncta. 
Length 0,052 mm. Breadth 0,032 mm. 
Pl Te tia te 
Balearic Islets rare (leg. Dr. SépeRLuND). 
This peculiar form belongs evidently to the Nav. Lyra section. It approaches in 
some respects NV. spectabilis Grec. and N. preteata Enp., but it differs of both. 
The numerous forms, belonging to this section, are so closely allied, that it is 
impossible to decide what are species or what varieties. Another most beautiful and 
gigantic form of this section is the following: 
7. Navicula (excavata Grev. var.?) Angelorum Cu. 
Very large, broadly oval, with rounded ends. Area large bilobate. Strie pun- 
ctate, radiant, 6'/, in 0,01 mm. (8 near the ends). Central strie 11°/, in 0,01 mm. 
Length 0,22 mm. Breadth 0,12 mm. 
Pi. U1, fig. 20, 7%. 
Fossil: California, Sancta Monica los Angelos (comm. by Dr. G. Ersen). 
8. Navicula Holmiensis Cu. 
Valve large, oblong elliptic, with rounded ends. Strie slightly radiant, 12*/, in 
0,01 mm., indistinctly punctate, covering a little more than half the valve and leaving 
round the median line an irregular area. 
Length 0,07—01 mm. Breadth in 0,023 mm. 
Ply. ee Ue es 
Slightly. brackish water near Waxholm (entrence to Stockholm) leg. LacrrsTept 
and O. NorpsTepr. 
This form agrees in general appearance with N. latiuscula Kurz. (N. patula W. 
Sm.), but has more distant strie, which in N. latiuscula are 18 in 0,01 mm. and pa- 
rallel. 
