492 



CLEVE, DIATOMS. 



N. sigmoidea (Ehb.) 



N. intermedia Hantzsch. 



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

 tis. A very remarkable variety with costse not reaching half- 

 way across the valve, 6 in 0,oi mm. and 17 strise in 0,oi mm. 

 PL 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. Tdbellaria Grun. 



Hantsschia ampMoxys var. calif ornica Grun. (A. Diat. pag. 103). 



Surirella elegans Ehb. 



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



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



S. apiculata W. Sm. (A. Schm. Atl. PI. XXIII, fig. 34—35). 



Gymatopleura Solea (Br6b.) W. Sm. 



Cydotella 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 algse, among which 

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

 have registered the following forms: 



Amphora ostrearia Br 6b. (H. L. Smith Lens II, p. 72, PI. 

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

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

 described as distinct species, as A. vitrea 01. A. quadrata Breb. 

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

 littoralis Donk. Specimens from Labuan have 12 strige in 0,oi 

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

 valve 0,095 mm. 



var. Porcellus (A. Porcellus Kitton in A. Schm. Atl. PI. 

 XXXIX, fig. 15—17. A. novrn caledonice Grun. 1. c. PI. XXVI, 

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

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

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

 puncta, 9 in 0,oi mm. Length 0,o6 mm. 



■ A. Weissflogii A. Schm. (Atl. PI. XXV, fig. 58) Strise 11 in 

 0,01 mm. Length 0,075 mm. 



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



