CH. n ON BOABD E.M.S. 'FLYING FISH' 29 



the steam-cutter for a little inlet hard by eaUed Bohoi Bay. 

 The two sides of the hay are very different in appearance. 

 On the north side there is a steep, rocky shore without 

 any trace of coral reef. On the south a broad belt of 

 mangrove swamp and a typical fringing reef. At the base 

 of the inlet, which receives a httle mountain stream, there 

 was an elaborate arrangement of bamboo fishing-stakes, 

 and, nestling amongst the trees on the northern shore, a 

 few smaU houses. 



No wonder that when the natives saw our little ' skuchi 

 api,' or fire-boat, ploughing through the water towards their 

 home, they thought discretion was the better part of valour 

 and retired into the bush. It must have seemed to them 

 passing strange that a party of apparently sane Europeans 

 should find it worth their while to pay a visit to Bohoi Bay. 



We landed upon the northern shore and walked along 

 towards a huge basaltic boulder which marked the entrance 

 to the bay.- Between the volcanic rocks and boulders along 

 the shore is a fine white foraminiferous sand, mainly 

 composed of Calcarina shells and Orbitolites. The rocks which 

 lie below high-water mark are covered with a fine layer 

 of acorn shells. Upon them may be seen a number of 

 brilHant httle green and yellow crabs and jumping fishes. 

 The crabs are called by naturaUsts Grapsus varius. They 

 are curiously marked with dark ohve-green stripes alter- 

 nating with bright yellow stripes and spots, and they are 

 capable of making the most extraordinary leaps and bounds 

 I have ever seen in crab-hfe. They would spring from rock 

 to rock with the greatest skill and precision, and when a 

 broad expanse of bare rock allowed it they would scamper 

 along at such a rate that I found it impossible to catch 

 them. 



' The rocks of the Yolcanic regions of North Celebes belong to the augite- 

 andesite series. 



