488 LOCALITIES OF MOLLUSCA. 



perfectly mild and docile, but soon pined away and died. 

 In many parts of Borneo, Celebes, or indeed any of the 

 islands of the Oriental Archipelago, if you wander along 

 a portion of the coast, where from a steep and stony 

 beach beset with rocks, a level sand-flat extends beyond 

 for a long distance, and is bounded seaward by a barrier 

 of coral, against which the ocean dashes with violence, 

 and forms breakers which leap tumultuously over and fill 

 numerous small ponds on the inner side, if you wander 

 along this, and observe with the curious eye of a Na- 

 turalist, you will notice various generic forms of Mollusks 

 engaged as follows, and in something like the following 

 order : Herbivorous Mollusks, that live upon the Fuel and 

 Alga covering the rocks and stones, come first ; Purpura 

 and Littorina, pretty brisk at certain times, and busy 

 grazing as the day closes in on their sea- weed pastures on 

 the exposed rocks, in company with Nerites with painted 

 backs, marked and figured with every variety of pattern ; 

 while Chiton, Murex, Doris, and Rissoa, more timid and 

 retiring, or more dull of disposition, hide under or adhere 

 to the surface of the stones, Nature having so closely 

 assimilated their forms, in many instances, to the stones, 

 and their colours to the cryptogamic plants that surround 

 them, as to make them invisible to the eyes of their 

 enemies. To these individuals which enjoy the blessings 

 of limited locomotion, may be added those more inert 

 members of the great Molluscous family, Siphonaria, 

 Patella and Vermetus; those Crustacean forms Conia and 

 Halanus, which are fixed upon the exposed rock-masses ; 

 and Policipen, Mytilus, Ostrcea and Byssoarca, which are 

 stuck fast in the crevices, or safely anchored in clefts and 



