172 
Orhage by Klitmøller inside the point at 2 meters depth, farther from land off Klitmøller only a few 
small specimens. — Sk: Collected at various places (Hanstholm; Bragerne; washed ashore by Svinkløv 
and Blokhus; Lenstrup; Hirshals: Skagen) in 2 to 13m depth, in most of the places only in small and 
scarce specimens. Found in greatest number and best developed at Hirshals, near land in 5 m depth, 
in company with Polyides. Greatest length observed 15cm. — Lf: Widely distributed, down to a depth 
of 6,5 m, but in most places loose, often in abundance on soft bottom (f. @gagropila). Reaches a length 
of 8—14cm. — Kattegat: Common and often abundant everywhere on stony bottom in depths down 
to 15cm. It reaches here a length of up to 28cm and is very often over 20cm high. It has also been 
dredged in several places in greater depths, down to 30m (e. g. ZB, Trindelen, about 30 m; ZS, Fladen, 
26,5 m; HZ, Store Middelgrund, 25,5 m), but it is more frequently missing than present in these greater 
depths, and, at all events, it occurs only in small quantities. In Herthas Flak in Kn, where I have 
dredged several times in 20 to 24,5 meters depth, it has never been met with. In Isefjord it has been 
recorded in various places, in Holbæk Fjord it occurs abundantly in a loose condition. — Sa and Lh: 
Common in depths down to 24m; at aZ growing gregariously over coarse sand (see above). — Sf: 
Several places. — Sb: Common in depths down to 20 m, greatest length observed 27cm; generally well 
developed specimens. — Sm: Several places down to 12 m depth; greatest length observed 10,5 cm — 
Su: North of Helsinger up to 25 cm high, south of Helsinger in depths down to 13m, up to 16cm 
high. — Bw: Found in depths down to 20 m; greatest length observed 24,5 cm. — Bm: Greatest length 
observed 12 cm. — Bb: Found in depths from one to 38 m (YA, east of Bornholm) in several places, 
but reaching only 9cm in length. 
Fam. 6. Rhizophyllidacee. 
Polyides Agardh. 
1. Polyides rotundus (Gmel.) Grev. 
Greville, Algæ Britann., 1830, p. 70, Tab. XI. Harvey, Phycol. Brit. pl. 95, 1840. Caspary, Ann. and 
Mag. N. Hist. Ser. 2, Vol. VI, 1850, p. 93. Thuret in Le Jolis Liste des Alg. mar. de Cherbourg, 1864, 
p. 140. Thuret et Bornet, Etudes phycologiques, 1878, p. 73—80, pl. 37—39. Guignard, Développ. 
et const. des anthérozoïdes. Revue gén. de Botanique. I, 1889, extrait p. 44, pl. 6 fig 10—12. Fr. 
Schmitz, Kleinere Beitr. z. Kenntn. d. Florideen. II. La Nuova Notarisia. Ser. IV. 1893, Estratto p. 8. 
Kolkwitz, Beitr. z. Kenntn. d. Florideen. Wiss. Meeresunters. N. F. 4. Bd. Abt. Helgoland. Heft 1, 
1900. Denys, Anatom. Untersuch. an Polyides rotundus Gmel. und Furcellaria fastigiata Lamour. 
Beih. z. Jahrb. d. Hamburg. wissensch. Anstalten 1910. 
Fucus rotundus Gmelin, Hist. Fucor., 1768, p. 110 tab. VI fig. 3. Flora Danica tab. 1544a (Hornemann 1816). 
Furcellaria rotunda Lyngbye, Tent. Hydr., 1819, p. 49. 
Polyides lumbricalis C. Agardh, Spec. Alg., 1822, p. 392, J. Agardh, Sp. g. o. II, 1863, p. 721. 
Furcellaria lumbricalis Kützing, Phycol. gener., 1843. p. 402, Taf. 72, Tab. phycol., Bd. 17, 1867, pl. 100. 
The external resemblance between this Alga and Furcellaria is well known 
and has often been mentioned, as well as the difference of the basal part being a 
disc in Polyides, while in Furcellaria it consists of branched rhizomes. The struc- 
ture of the erect frond has already been thoroughly studied by KüTziNG (1843)! and 
Caspary (1850). The structure of the upper end of the frond is that of the foun- 
tain type (Oltmanns’ “Springbrunnentypus”) as plainly shown by Kérzine (1. c.). 
As to the structure of the erect fronds, reference may be made to the papers of 
* The troublesome synonymy of this Alga is responsible for the fact that WILLE (Bidr. t. Alg. phys. 
Anat. K. Svenska Vetensk. Ak. Handl. Bd. 21. 1885, tafl. VIII fig. 14) and Orrmanns (1904, p. 546, fig. 330) 
have used copies of Kürzıng’s figures of it to demonstrate the anatomy of Furcellaria fastigiata (comp. p. 165). 
