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Kocu, L., ’96, Untersuchungen iiber die bisher fiir Oel oder Phloroglucin 
gehaltenen Inhaltskérper der Fucaceen. Inaug. Diss. Rostock. 
Kuntze, O., ’81, Revision von ae und das sogenannte Sargasso-Meer. 
Engler’s Bot. Jahrb. 1: 191-239. pls..1-2. 
MitcHett, M. O., and Wuarrtrnc, F. G., ne On Splachnidium rugosum Grev., 
the type of a new order of algae. Phycological Memoirs Part I. pp. 1-10. 
Learn F., ’89, Beitriige zur Kenntniss der Fucaceen. Cassel. 
 Meaghleige und Biologie der Algen. Jena 
a4 L 76, Beitrage zur Kenntniss der Tange. Jahrb. Wiss. Bot. 10:317- 
382. pls. 25-27. 
VALIANTE, R., ’83, Le Cystoseirae del Golfo di Napoli. Fauna und Flora Golfes 
Neapel '7: 1-30. pls. 15. 
EXPLANATION OF PLATES X AND XI. 
All figures were sketched with a camera and reduced one third in reproduc- 
tion. Figs. r-30 were drawn with Zeiss apochromatic objective 1.5™™ and com- 
pensating ocular number 4, magnification 1140. Figs. 31 and 32 were drawn with 
dry objective, magnification 570. 
PLATE X. 
Figures 1-11. Development of the conceptactle. 
Fic. 1. Initial cells, longitudinal section; 1a, cross section of apex; 1m, cross 
section of median portion; 1b, cross section of basal portion. 
Fic. 2. Two-celled stage, longitudinal section showing the slender upper 
tongue cell, and a larger lower cell; 2a, cross section of the apex showing the 
tongue cell only; 2m, cross section of the median portion with the centrally placed 
basal region of the tongue cell surrounded by the upper part of the lower cell; 
26, cross section of the basal portion showing the lower cell only. : 
Fic. 3. Three-celled stage, longitudinal section; 3a, cross section of the 
apex showing tongue cell only; 3m, cross section of median portion with the cen- 
trally placed lower part of the tongue cell, surrounded by the upper part of its two 
companion cells; 3b, cross section a little below 3m, showing the same cells; 
3, cross section of the basal portion showing the two lower cells only. 
Fics. 4 and 5. Longitudinal sections of a peculiar trinucleate stage of one 
conceptacle. The first division of the nucleus of the initial cell must have been 
with the axis of the spindle perpendicular to that of the cell. Fig. 5 contains one 
of the nuclei of the first mitosis and fig. 4 the products of a division, now in late 
telophase, of the other nucleus of the first mitosis. 
Pb o = Oo 
ag MW MW 
walls Celi ~~ 
the tongue cell. - 
tudinal section of a later stage with six similar wall cells and the 
Fic. 7. Longitu 
centrally placed tongue cell. 
