214 W - C - ALLEE. 



Table IV. shows data taken from the records from the U. S. 



Table IV. 



Showing Temperature and Salinity from the Noon Readings 



of the U. S. Fish Commission at their Woods Hole 



Wharf for August, 1920. 



The raw data in sp. gr. and Fahrenheit have been converted to percentage of 

 salinity and the centigrade scale for purposes of comparison. 



Fish Commission from their collections off the Fish Commission 

 Pier and is given for comparison with records from wharf pilings 

 and also with those from open water. 



The vertical distribution in the wharf piling association is 

 marked. Near the high tide level may be found the Littorinas, 

 XJrosalpinx, Balanns balanoides and an occasional Asterias forbesi. 

 Nearer the water at low tide are Mytilus clusters and Modiolus 

 modiolus sheltering Libinia dubia and Lepidonotus. Below these, 

 normally under water at all times, come Amarcecium and Styela 

 and other pile dwelling chordates. Here are found the sponges, 

 Microcione, Grantia and Cliona and the hydroids such as Tubu- 

 laria and Schizotricha. With all these there is the attendant 

 fauna of worms, Lepidonotus, Harmothoe, Sthenelais, Nereis 

 pelagica and limbata; the sea slug Coryphella and the Columbella 

 snails are also abundant. Here also are Bugula and the en- 

 crusting bryzoans, Schizcporella, Lepralia, Membranipora and 

 the like. Below these arc the sea anemones, Metridium. 



