) 223 
300 4 broad, the valves are semi-lunate with very fine radiating points, 
hyaline central space and coarser points within the margins, but the more 
robust striz which Van Heurck |. 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 
. . Fig. 2. Palmeria Hardmaniana Grey. 
Fig. 1. Palmeria ae aha Mee STEN ; 
showing the Amphorella’s fixed to the scale. (29°) 
L 
Hardmaniana Grey. 
Cells in different views (42). 
an Amphorella borealis (Hensen) Dad., var. nov.; the small, more or 
less numerous, organisms were fixed to the inner nae of the fissure. 
Chromatophores are numerous, small, dispersed on the inner side of 
the frustules; the nucleus is placed close to the one vaive. 
Professor Cleve J. c. seems to take this Jarge diatom as an assym- 
metrical form of Coscinodiscus nobilis, but 1 am quite convinced that this 
is not the case; on the other hand I believe, that the genus Palmeria is 
close to Coscinodiseus, and that Schtitt in Engler & Prantl has made a 
mistake in placing his Lwodia (incl. Palmeria) among the Biddulphioideue, 
remote from the Discoideae. 1 should prefer placing it close to the genera 
Ethmodiscus and Coscinodiseus. 
3(rr) — Tr) — Lot). 
Area: Malay Archipelago, China. 
Actinodisceae. 
Asterolampra Ehbg. 
11. A. rotula Grev. in Transact. Microsc. Soc. 1860, p. 111, Pl. 3, 
f.5; Lemmermann, |. ¢. p. 317 and 319, Pl. 2, f. 35; Ostenfeld & Schmidt, 
P]. f. the Red Sea etc., Vid. Medd. Nath. For. Kjobenhavn, 1901, p. 152; 
Schréder, Phytoplankton des Golfes von Neapel, Mitteil. a. d. Zool. Stat. zu 
