MARINE AI.CAL COMMIMIIKS OK 1 IIK JIAN KtRNANDKZ ISLANDS 673 



St. 36. Masatierra, Hahia Cuiiibcrland. 22.8. 1908. 



a. Upper littoral, tlry clurin<; low tide. Boulders with coarse black sand 

 between. On rock: Enteyoiiioyplia-L lioiidriclla-Cnlidium Ass. 



Cliacio))iorpha acrca, Entcroiiiorp/ia hifesihialis, Clva rigida. — Conipso}iciiia 

 ramulostim (epiph.), Ectocarpus cotifcnwides (epiph.). — Cliantransia catoiulaia and 

 pacifica (ef)iph.>, Chondriella pusilla, Erythrotrichia cartiea (epiph.), Gelidium 

 pseudointricatum, Ci. pusiiiiiiii, (Jigartina Lessojiii, G. spec, Porphyra in>ibiUcalis. 



On sand between the boulders, protected from the heavy surf, but as a rule 

 gentl)' washed: Entcrouiorpha-Chactomorpha aiitemiina Ass. 



Chaetomorpha antennina, Enteromorpha intestinalis, I'lva rigida. 



b. Lower littoral, washed b\- the surf at Kjw water. Ulva rigida Ass. 

 Ulva rigida. — Ectocarpus granulosus, Ilea fascia. 



St. 38. ]\Iasatierra, Puerto Ingles, rocks at the small cove where landing 

 is effected in good weather. 25.8. 1908. 



a. Upper littoral, laid dry for a couple of hours, but often sprayed. Ente- 

 roniorplia- CJioudriella- Gelidium Ass . 



Enteromorpha intestinalis. — Chondriella pusilla, Gelidium pseudoin- 

 tricatum \ar. altius. 



b. Lower littoral, washed also at low tide. Glossop/iora Ass. Colponienia 

 sinuosa, Glossophora Kunthii. — Litlwthaniniou (Lithophyllum?) spec. 



St. 39. 26.8.1908. St. 2— 3. 15.1.-^26.1.1917. Masatierra, Bahia del 

 Padre. Wide rock beach with large boulders. Less exposed. 



a. Upper littoral (St. 39 a, St. 2 a-^bl \^ertical extension 4 — 5 dm. 



1. Upper belt. Dry at low tide and not washed in calm weather. Hydro- 

 coleus Ass., making the rocks very slipper}-. 



Hydrocoleus lyngbyaceus. — Hildenbraiulia prototypus. 



2. Middle belt. Dry during approximately 2 hours. Enteromorpha-CJiond- 

 riclla- Gelidium- LitliopJiylluDi Ass. 



Enteromorpha intestinalis, Ulva linza. — Chondriella pusilla, Gelidium 

 pseudointricatum. — Lithophyllum ferjiandeziamim . 



In pools: CodiuDi-Ectocarpus-LitJiopJiyllum Ass. 



Codium fernandezianum, Microdictyon japonicum. — Ectocarpus Mitchellae, 

 Sphacelaria cirrhosa (epiph.). — Coraliiua sp., Erythrotrichia carnca (epiph.), 

 Goniotrichum alsidii (epiph.), Lithophyllum (Melobesia) sp. (epiph.), Polysiphonia 

 abscissa. — Lithophyllum fernandeziamun. 



3. Lower belt, transitional to b. Continuation of 2, with addition of bushy 

 colonies of Scytothammis and of some other species. The uppermost tufts of 

 Splachnidium are found here. 



Chaetomorpha anteuniiia. Enteromorpha intestinalis (on Scytothamnus), i Ira 

 rigida. — Colpomenia sinuosa, Scytosiphon lomentaria, Scytothamnus australis. — 

 Chondriella pusilla, Gelidium pseudointricatum, Gigartina spec. 



b. Lower littoral (St. 39b, St. 3). Uncovered during i — 1^2 hours, but 

 as a rule always washed by the surf; dry only when the sea is exceptionally 

 smooth (see plate 54). 



