5IO 



THE POPULAR SCIENCE MONTHLY 



Laminaria and the perforated Agarum, belonging to the same group. 

 The surfaces of the islands bordering the water stretches and of the 

 peninsulas pushing seaward from the mainland are covered with ever- 

 greens, while as one passes up the sounds towards the mainland proper 

 this evergreen growth gives place to deciduous trees. Hence, within a 

 comparatively short distance, the botanist may have a wide range of 

 vegetation. 



Out " upon the sunny seas " float Aurelia flavidula and Cyanea 

 arctica in countless numbers. Melicerta and Pteropods occur during 



Fig. 4. Typical Rock Structure forming the Tide-pools. 



the greater part of the season, and these may be collected in a row- 

 boat within the sounds themselves. On shallow banks of sand exposed 

 entirely at low tide Echinarachnius parma may be collected in quanti- 

 ties, and with great ease. Strongylocenirotiis drohachiensis is dredged 

 by the bushel within a mile of the laboratory, while the same dredgings 

 bring up Dentalium, Corymorplia, Chalina, Edwardsia, Pentacta, Tere- 

 hratulina, Pecten tenuicosiaia, Boltenia and other classics. 



The one-day trips from the laboratory may be undertaken in one of 

 many directions. Twenty miles is generally a recognized limit. The 

 map reveals the possibilities of a day's collecting. All the trips are in 



