330 Annals of the Carnegie Museum. 



The Lower Beach. — The Chlamydomonas Formation. 



The Lower Beach of this succession although consisting mainly of 

 finer sand differs in no respect as to vegetation from the lower beach 

 of the more westerly succession. A few sporadic patches of Chlamy- 

 domonas were observed. 



The Drift-beach. — The Cakile-Xanthium Formation. 



The Drift-beach and its formation correspond here very closely 

 to the homologous structures occurring to the west of the Fog 

 Whistle, but the effect of the prevailing currents in times of the 

 heaviest surf in carrying the disseminules of various plants to the 

 east and southeast and also, perhaps, the less direct exposure to the 

 prevailing cold westerly winds, is to be seen in the greater abundance 

 of plant-life towards the southeast. The same species constitute the 

 formation in both successions, but they are all, especially Strophostyles 

 helvola, much more abundant towards the southeastern extremity of 

 the beach. 



The accumulation of drift is considerably greater in this habitat 

 than it is to the northwestward, and, although by far the greater por- 

 tion of this organic material probably undergoes eremacausis, some 

 humification may occur and may have some part in bringing about a 

 greater abundance of plant-life in this locality. A more important 

 factor is probably the protection afforded many of the seedlings by 

 the driftwood. 



The Sand-plain. — The Faniaan-Artefnisia Formation. 



In the Sand-plain southeast of the Fog Whistle the habitat differs 

 again very little from its homolog to the east, except in the presence 

 of more driftwood and a finer soil texture. There is thus more soil 

 moisture, and, because of the presence of the driftwood and the prox- 

 imity of forest to the south and southwest, there is somewhat more 

 protection from the cold winds than is the case in the more eastern 

 sand -plain. 



Listing the consocies of the Panicutn-Artemisia formation in this 

 habitat there are the following : 



(rt) Pajiicum- Artemisia Consocies, 

 (^) Andropogon furcatus Consocies, 

 (^) Stenophyllus capillaris Consocies, 



