



A. Tlie ■•lilhothaninion ridge" along llie uuter edge of the southeast ree| of M^aer Island. 



The ridge is shown laid hare at the low spring tide of Septemher 30. 1913. 



B. Two stocks of Seriatopora histrix. which were removed from their habitat at aliout l.OnO 



feet from shore and taken into shallow water near the beach in order to be photo- 

 graphed. The top of the larger stock is cut off squarely at the level of lowest tidc^. 



