621 
seemed situated in the middle of the chromatophore, suggesting a pyrenoid; but on 
observing well fixed cells with less dense contents, I succeeded in ascertaining that 
the intensely stained body was not a pyrenoid in a stellate chromatophore but a 
real nucleus situated in the cytoplasm and surrounded by chromatophores (fig. E, F). 
According to BATTERS (l.c. p. 26) the “inflations”, by which term he denotes the 
fertile cell complexes, usually consist of from two to ten cells. The branched com- 
Fig. 618. 
Conchocelis rosea. In shells of Pomatacerus triqueter. A—H, collected at Københavner Rev near Frederikshavn, treated 
with picric acetic acid, stained with hemalum. J—L from Marens Rey at Frederikshavn. A, long cell showing chromato- 
phores and nucleus. B and C, long filament with branches consisting of inflated cells. D, E, F, inflated cells. G, 
branched complex of broad filaments. H, end of fertile cell-row. J, a couple of inflated cells with dense contents 
springing from a thin filament. K, a fertile cell-row in connection with thin filaments. L, four cells of a fertile cell- 
row from a section through a decalcified shell, showing the central nucleus and radiating plasma-strings, while the 
chromatophores are feebly stained. A—F, H—K 630:1. L 730: 1. 
plexes of fertile cells here described contain a much larger number of cells, about 
50 or more. It is probably such complexes of which Barrers treats when he 
writes (1. c. p. 27) that “the inflations often become detached from the horizontal 
filaments and are capable of an independent existence”, and that he has found 
them of all sizes and shapes. The continuity of the larger complexes of fertile cells 
with the thin filaments was not indeed observed by me, and it is probable that 
their growth can be continued, if their connection with the thin filaments should 
