the signification of which is unknown (fig. 106 D, E). An incompletely developed 
cystocarp is shown in fig. 106 F, it consists of a very small number of upwardly 
directed filaments, which have been somewhat displaced by pressure; the auxiliary 
cell has produced a lateral outgrowth, but is otherwise not swollen. Fig. 106 G 
shows a ripe cystocarp; the auxiliary cell, or better, the fusion cell, is here seen 
as a large cell connected by pits with the neighbouring cells of the vertical filament. 
All the cells of the cystocarp seem to produce a very large carpospore. The ripe 
cystocarp consists of a spindle-shaped heap of large cells, few in number, reaching 
downwards considerably beyond the insertion of the auxiliary cell; it has earlier 
been shortly described and figured by Batters (I. c.). 
The species occurs from low-water mark down to 30 meters depth. In some 
places in the eastern Kattegat it occurs abundantly, covering the stones with ex- 
tensive crusts, forming an association. The sporangia arise in autumn; they are 
found ripe in winter and spring, emptied in spring and summer. Carpogonia were 
met with at all seasons, often abortive however; cystocarps have only been met 
with once in July. 
Localities. Sk: Off Lønstrup (ZK°), on Laminaria hyperborea. — Kn: Herthas Flak (!, Børgesen); 
TX, at Hirsholmene; Krageskovs Rev; Busserev at Frederikshavn; harbour of Frederikshavn; VU, east 
of Nordre Ronner, 15 m; TO, TP, Tonneberg Banke, 16—18 m; FF, TR, Trindelen, — Ke: IR, IT and 
VZ, Groves Flak, 24,5 m; IQ, ZE!, Fladen; II, IK, Lille Middelgrund; Store Middelgrund (Borgesen), 30 m; 
IA, Store Middelgrund, 16 m; OO, Ssborghoved Grund. — Km: XC, NW of Anholt, 11 m, on the base 
of Halidrys; D, north of Isefjord, on Fucus serratus, 11m. — Sa: BF, off Sletterhage, 14m; PH, Lind- 
holms Dyb, 20,5 m; Northside of Refsnæs (C. H. Ostenfeld), 19m; DK, Bolsaxen, 14 m. — Lb: CC, South 
side of Hornenæs, on Mytilus, 7,5 m. — Sh: NN, Southwest of Sprogø, 19 m. — Su: bM, South of Hveen. 
Cruoriopsis Dufour. 
Dufour, Elenco delle Alghe della Liguria, Genova 1864, p. 35 (non vidi), Schmitz and Hauptfleisch in 
Engler u. Prantl. I, p. 535. 
1. Cruoriopsis danica sp. nov. 
Crusta sanguinea, diametro c. 2—3 mm, ad 744 crassa. Stratum basale uni- 
stratosum, substrato arcte adnatum, e filis radiantibus compositum, cellulis 4—9 » 
plerumque c. 6—9 „ latis, c. 6—7 „ altis, latitudine plerumque c. duplo longioribus, 
nonnunquam lateraliter confluentibus. Fila erecta 4—7-cellularia, «qualia vel in 
inferiore parte nonnunquam sursum paulo attenuata, 5—11,y lata, cellulis longitu- 
dine vario, inferioribus nonnunquam non nisi dimidiam partem latitudinis attingen- 
tibus, superioribus latitudine sæpe duplo longioribus, chromatophorum singulum 
continentibus. Pili hyalini terminales nonnunquam sparse occurrunt. Sporangia 
in filis erectis terminalia, solitaria, rarius bina, ellipsoidea, 23—30 » longa, 14—18 u 
lata, oblique cruciatim divisa. Organa sexualia ignota. Cellule auxiliariæ (?) bre- 
vissimæ in parte media vel superiori filorum seriatæ. 
The cells of the basal layer form regularly radiating filaments of varying breadth. 
Lateral fusions may be wanting in some cases, while in others they occur in great 
