226 



the}' were in all cases, when examined, empty and more or less destroyed. 1 found 

 sporangial conceptacles 300//. or somewhat more in diameter. 



On stony bottom in 10 — 21 meters depth, usually associated with Corallina 

 officinalis, in some places abundantly. Only found in the Samso area. 



Localities. Sa : KI, soutli of Hjelm; PH, [..indholms Dyli; east of Sains0 (Lofting); Stenpladeii 

 off Sletterhage (G. WintlierK BE and BF off Sletterhage. 



Fig. 14.3. 



IJIhothainnion iiurDeijicuin. A. :ixile longitudinal section of l)ranch. B. pari of a similar section near tlie top. C. 

 part or axile longitudinal section of frond. The upper part of the tissue was deeper stained by h;ematoxyline than 

 the under part. The fusion canals with the over-lying cells appear as round figures. I), transverse section of the 

 central tissue of :i br;uicl). li, cell-rows from the peripliery of a section of a Ijranch. cells witli starch grains. 



A ni A - B D ■m-.l-, E, F 5(50 : 1. 



6. Litliothaniniou calcareum (Pallas) Aresch. 



J. Aresehoug in .1. Agardii, Sp. g. o. II, 1851, p. .523. Foslie, Lith. Adriat. Meeres u. MaroUko, Wiss. 

 Meei-esunt. VII. Heft 1, 1904, p. 13 and 32, Tafel II; Bemarks, 1905, p. (i7; Mine P. Lenioine, Repar- 

 tition et mode de vie du .Maerl (Litliothamnion calcareum) aux environs de Concarneau (Fiiiistere), 

 Annates de I'lnstitut oceanograpliique, tome I, fasc. 3, 1910; Structure, 1911, p. 102. 



Millepora calcarea Pallas, Elench. Zooph. 1766, p. 265. 



Lithothamnion coniUoides Crouan, Flor. Finist., 1867, p. 151, pi. XX no. 133. 



This species has been found in a few localities, in particidar in the eastern 

 Kattegat, but always only in loose specimens without or with imperfectly developed 

 conceptacles. It is, as elsewhere, rather variable. The Danish specimens have been 

 referred by Foslie to the following forms. 



1. F. squarrulosa Foslie, Lith. Adr. Meer. Taf. II fig. 1 — 4; Lemoine, Repart. du 

 Maerl fig. 1, 5, 14, Structure pi. I, fig. 5. To this form approaches f. corallioides 

 (Crouan) Foslie, Norw. Lith. p. 62 pi. 16 figs. 24—25, 27—31. — This form has terete 

 branches spreading in all directions. 



2. F. conipressa (M'Calla) Foslie, On some Lithothamnia, 1897, p. 9, Lith. Adr. 



