674 



C. SKOTTSBERG 



Chaetoiiiorpha fir })ia-Splachnidiuni-Lithophy limn Ass. 



Chaetomorpha firma, Cladophora perpusilla (on Splachnidmni), Codiuin 

 cerebrifoDiic, Ulva ucuiaiodea, U. rigida. — Colpomenia sinuosa, Ectocarpus 

 arabicus (on Codiw/i), E. JicDiispJiaericus (oh Splachnidinm, etc.), E. Mitchellae 

 (on Codiuiii and Splachiiidiuui), E. pitsdhis (on C liaetoiiwipJid), Geinjnocarpus 

 geminatus (on Corallina and Codiuui), Padina fernandeziana (large tufts), Scyio- 

 siphon lomentaria, Splachnidium rugosum. — Chantnmsia gj^andis and Tlm- 

 retii (on Splaclniidiiiin), Corallina spec, Lauroicia obtusa. — Lithophyllum fer- 

 nandezianum. 



More or less confined to the pools and uppermost sublittoral: Codiuin- 

 Lithothaniuioji (Lithophyllum.^) Ass. 



Codium cerebriforme, C. fernandezianum, Halicyslis pyriformis (scarce, 

 on the coralline crust), Microdictyo)i japoniciiui. — Ectocarpus arabicus (on Codium), 

 E. cyliiidricus (on Microdictyori), E. Mitchellae (on Codiuin, etc.), Geniinocarpus 

 gcminatus (on Codium), Glossophora Kunthii, Padina fernandeziana, SpJiace- 

 laria cirrJiosa (epiph.). — Centroceras clavulatum, Chaidransia catenulata, grandis 

 and Thuretii (epiph.), Corallina spec, ErythrotricJiia carnea (epiph.), Goniotrichum 

 cornu ceri'i and alsidii (epiph.), Polysiplwuia abscissa. — Crusts of Lithothamnion 

 (Lithophyllum.^) spec. 



St. 40 a. Masafuera, landing place at entrance to Ouebrada de las Casas. 

 28.8. 1908. Coast cliffs, exposed to the surf, as a rule washed or sprayed also 

 at low tide. In crevices coarse black sand. Clva rigida-Grateloupia Ass. 



Ulva rigida. — Gemiiiocarpus geminatus (on Grateloupia), Scytothamnus 

 australis. — Dendrymenia flabcllifolia (young, very small). Gelid iella spec, 

 Grate hup ia subs imp lex. 



The sublittoral region. 



St. 10. Masatierra, Bahia Cumberland. 3.1.1917. On a buoy in the har- 

 bour, always remaining in the same relation to the water level. Uppermost 

 sublittoral. 



a. L^pper narrow zone at water's edge. Scytosiphon Ass. 



Ectocarpus granulosus and Mitchellae (on ScytosipJioii), Scytosiphon lo- 

 mentaria. 



b. Lower zone. Ulva linza-Lepas anatifera (Ass.') 



Ulva linza. — Colpomenia sinuosa (very small spms), Ectocarpus confervoides 

 (on stalk of Lepas), E. granulosus and Mitchellae (on shell oi Lepas), Ilea fascia. 

 Scytosiphon lomentaria (scarce). — Ceramium rubrum and PolysipJionia abscissa 

 (both on small Spongiae). 



St. 8. Masatierra, in front of Pangal. 10.4. 1917. 10 — 25 m. Sand with 

 stones, supporting the algae. Dictyotaceae-CodiumRhodomelaceae Ass. 



' The zoological collection from St. 10 includes Lcpas pectinata Spengler (i spm), L. ana- 

 tifera L. (several spms) and Balamts psittactis Darw. (see this work, vol. Ill, p. 483. 



