A Monograph of Marcus Island. 119 



and in the coconut grove. By day they were to be seen feeding on 

 fallen coconuts and bits of refuse ; at night they were even more 

 adlive and were often heard scurrying about in the coconut thatch 

 overhead. Frequently they were found in our larder helping 

 themselves. When disturbed they would move off sideways a few 

 steps and stop to observe the intruder, assuming an attitude of 

 both importance and injury that was most ludicrous to behold. 



Grapsus grapsus (Linn.). 



Almost as abundant as the preceding species and similar to it 

 in habits. 



Geograpsus crinipes (Dana). 



Judging by the specimens secured this is not an abundant 

 species on the island. 



I^eptodius sanguineus (M. Edw.). 



Common species on the rocks, and was frequently secured in 

 the small mesh nets used in fishing. 



Petrolisthes Speciosus (Dana) var. 



A number of specimens of this adlive crab was secured In life 

 they are bluish all over, variously marked with small black spots. 



Coenobita olivieri Owen. 



This bright red crab was an abundant species and to be seen 

 day and night often well inland. They usually congregate about 

 the dead bodies of birds, on which they feed ; however, they are 

 good climbers, as many of them were found well up in the trees 

 where they had evidently gone in search of food. When disturbed 

 in any way they simply let go their hold and dropped to the ground 

 with a heavy thud. As a habitation the cast off shells of Tnrbo 

 radiatus Gmel. seemed to be preferred by them, though other 

 shells were often used. 



Coenobita compressa Guerin. 



I did not find C. compressa quite as abundant as the foregoing 

 species. Specimens colledled inhabited the shells of Tnrbo argy- 

 rostomiis Linn. 



