8 v. T. CLEVE, ON SOME NEW DIATOMS. 



N. Hennedyi var. Tahitensis Cl. 



Broadly oval with almost parallel sides. Striae scarcely punctate, marginal 13 in 

 0,01 mm., central 15 in 0,01 mm. 



Length 0,05 mm. Breadth 0,023 mm. 



Pl. I, tig. 14, -«7x. 

 Tahiti (Eugenie Exp.). 

 This variety is remarkable for its almost sraooth striae. 



6. Navicula rudis Cl. N. Sp. 



Broadly oval, with broadly rounded ends. Striaä coarse, 6 in 0,01 mm. marginal 

 composed of about 5 — 8 large, separata puncta; central striaB composed of 2 — 3 puncta. 

 Length 0,052 mm. Breadth 0,032 mm. 

 Pl. II, fig. 17, ""%. 

 Balearic Islets rare (leg. Dr. Söderlund). 



This peculiar form belongs evidently to the Nav. Lyra section. It approaches in 

 some respects N. spedabilis Geeg. and N. praetexta Ehb., 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. Navicida {excavata Geev. var.?) Angelorum Cl. 



Very large, broadly oval, with rounded ends. Area large bilobate. StrifB pun- 

 ctate, radiant, öVa in 0,01 mm. (8 near the ends). Central striaä 11 Va in 0,01 mm. 

 Length 0,22 mm. Breadth 0,12 mm. 



Pl. II, fig. 20, '"Vi. 

 Fossil: California, Sancta Monica los Angelos (comm. by Dr. G. Eisen). 



8. Navicula Holmiensis Cl. 



Valve large, oblong elliptic, with rounded ends. Strite slightly radiant, I2V2 i" 

 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. 

 Pl. II, fig. 18, "°7,. 



Slightly brackish water near Waxholm (entrence to Stockholm) leg. Lagerstedt 



and O. NORDSTEDT. 



This form agrees in general appearance with N. latiuscula KiiTZ. {N. patida W. 

 Sm.), but has more distant striae, which in N. latiuscula are 18 in 0,01 mm. and pa- 

 rallel. 



