762 C. SKOTTSBERG 



developed as a thin cover on bedrock in pools and below low-water mark in 

 the surf zone. It is very difficult to get samples of this crust. Probably Litho- 

 phyllum decipiois is one of the leading species; whether, as 1 supposed, L.fer- 

 nandezia7ium is another (comp. Levring I. c. p. 754), seems uncertain. 

 P. 681 etc.. Geographical distribution. 



The total number of species. Corallines included (with exclusion of the 

 doubtful Lithophyllum ferna7idezia7ntni) is 1 00. The following additions should 

 be made to the geographical groups; the figures have been corrected accordingly. 



Group I. 20 sp. = 20 %. — Group 2. 14 sp. = 14 %. a, 7 sp. = 7 %; 

 b, add Lithophyllum pustulatum: 7 sp. == 7 %. — Group j. Add Corallina chi- 

 lensis (also reported from Japan); 8 sp. ^ 8 %. — Group 4. Add Lithophyllum 

 decipiens (also West Indies) and Litliotlianinion validum: 9 sp. = 9 %. — Group j. 

 10 sp. ^ 10 %. a, 3 sp. ^ 3 %; b, add Corallifia Cuvieri: 5 sp. =- 5 %. — 

 Group 6. Add Lithophyllum bennudense; 2 sp. = 2 %. — Group 7. Add Litho- 

 phyllum discoideum; 5 sp. = 5 %. 



The increase in groups 5 (West Pacific) and 7 (Subantarctic) is of interest. 



P?-inted ''/s 1943. 



