— 5 — 



300 fi broad, the valves are semi-lunate with very fine radiating points, 

 hyaline central space and coarser points within the margins, but the more 

 robust striæ which Van Heurck 1. c. p. 539 mentions, are only obscure 

 in my form. The girdle is very unequal, narrow on the straight side and 

 very broad on the curved side, so that the whole frustule resembles a 

 piece of an orange. 



Curious is a curved fissure on the valves; in most specimens which 

 I have seen, this fissure was a place of refuge for a little protist, probably 



Fiu- 1 Palmeria ^' ^ mer ^ a Harclmaniana Grev. 



Eardmaniana Grev. showin ^ the Amphorella's fixed to the scale. (!££) 



Cells in different views (M). 



an Amphorella borealis (Hensen) Dad., var. nov. ; the small, more or 

 less numerous, organisms were fixed to the inner side of the fissure. 



Ghromatophores are numerous, small, dispersed on the inner side of 

 the frustules; the nucleus is placed close to the one valve. 



Professor Cleve Le. seems to take this large diatom as an assyim 

 metrical form of Coscinodiscus nobilis, but I am quite convinced that this 

 is not the case; on the other hand I believe, that the genus Palmeria is 

 close to Coscinodiscus, and that Schiitt in Engler & Prantl has made a 

 mistake in placing his Euodia (incl. Palmeria) among the Bidclulphioideae, 

 remote from the Discoideae. I should prefer placing it close to the genera 

 Ethmodiscus and Coscinodiscus. 



3 (rr) — 7 (it) — 10 (it). 



Area: Malay Archipelago, China. 



Actinodisceae. 



Asterolampra Ehbg. 



11. A. rotula Grev. in Transact. Microsc. Soc. 1860, p. Ill, PL 3, 

 f. 5; Lemmermann, 1. c. p. 317 and 319, PL 2, f. 35; Ostenfeld & Schmidt,. 

 PL f. the Red Sea etc., Vid. Medd. Nath. For. Kjøbenhavn, 1901, p. 152; 

 Schröder, Phytoplankton des Golfes von Neapel, Mitteil. a. d. Zool. Stat. zu 



