492 CLEVE^ DIATOMS. 



N. sigmoidea (Ehb.) 



N. intermedia Hantzsch. 



N. Denticida Grun. var. minor, lanceolata, costis abbrevia- 

 tis. A very reniarkable variety with costae not reaching half- 

 way across the valve, G in 0,oi mm. and 17 strice in 0,oi mm. 

 PI. 37, fig. 68. It is only on the authority of Mr. Grunow 

 that I have accepted the determination as a variety of N. 

 Denticula. 



N. Tahellaria Grun. 



Hantzschia ampliioxys var. californica Grun. (A. Diat. pag. 103). 



Surirella elegans Ehb. 



S. saxonica Auersw. (A. Schm. Atl. PI. XXII, fig. 1 — 2j. 



S. linearis W. Sm. (A. Schm. Atl. PI. XXIII, fig. 27—33). 



.S'. apicidata W. Sm. (A. Schm. Atl. PL XXIII, fig. 34—35). 



Cymatopleura Solea (Breb.) W. Sm. 



Cyclotella comta Ehb. 



Melosira varians Agardh. 



IV. Diatoms from Labuan. 



During the stay of the Vega in Labuan near Borneo Dr. 

 Kjellman made some gatherings of marine algee, among which 

 was found a number of diatoms, which I have examined. I 

 have registered the following forms: 



Amphora ostrearia Breb. (H. L. Smith Lens II, p. 72, PI. 

 I, fig. 16. — A. Schmidt Atl. PI. XXVI, fig. 23? stria) not 

 punctate!) This very variable species occurs in many forms, 

 described as distinct species, as A. vitrea CI. A. quad rata Br eh. 

 A. elegans Greg. A. memhranacea W. Sm. and Roper. A. 

 littoralis Donk. Specimens from Labuan have 12 strire in 0,o] 

 mm., composed of distinct, separate puncta. Length of the 

 valve 0,095 mm. 



var. PorceJlus (A. PorceUiis Kitton in A. Schm. Atl. PI. 

 XXXIX, fig. 15—17. A. novce caledonice Grun. 1. c. PL XXVI, 

 fig. 16 — conf. Grun. Arct. Diat. pag. 25). The variety from 

 Labuan has the outline of A. arcuata (A. Schm. Atl. PL XXVI, 

 fig. 27 — 29) but has much coarser striae, composed of distinct 

 puncta, 9 in 0,oi mm. Length 0,og mm. 



A. Weissflogii A. Schm. (Atl. PL XXV, fig. 58) Stria) 11 in 

 0,01 mm. Length 0,075 mm. 



A. Schmidtii Grun. (A. Schm. Atl. XXVIII, fig. 2). 



