INTRODUCTION. VU 



found running over the rocks near the sea, feeding on the Blennies and Periophlhahni that 

 quit the water occasionally ; they feed also on the different Cirripedes. There is one species 

 (67. latifrons, White) that I have found inhabiting fresh-water rivulets and ponds, which, 

 however, has aU the- quick and wary habits of the other species, and when pursued hides 

 under weeds and stones. Among numerous other forms observed along the Bornean coast, 

 I may allude to the Sicyonia of Edwards, which swims in a slow and deliberate manner 

 forwards, and occasionally propels itself backwards with a sudden jerk ; it keeps at a con- 

 siderable distance from the shore, and appears to love deep still water. 



The Spheromce are generally obtained in company with Cymodocece, Cypridinm, Amphi- 

 podece, and others, among dense masses of floating sea-weeds, where they appear to lead an 

 active predatory life amid the populous mazes of the Sargassum, &c. They are constantly 

 spinning and darting about, rolling up their bodies into a ball, then straightening them, and 

 crawling among the algse and keratophytes, with a great deal of vivacity. Among the 

 collection brought home in the Samarang, are several species not before known to Crusta- 

 ceologists. Like the genera Tlienus and Ibacus, the Scyllarus lives at some distance from 

 the shore, and in tolerably deep water. It swims in the manner of Crangon, by rapid 

 inflexions of the abdomen, occasionally springing through the water with the greatest 

 velocity in a backward direction, and, when caught, wounds the hands with its tail, throwing 

 it about with violent jerks. At Unsang in Borneo, which was the next place visited, I 

 discovered a new species of Alope, (White,) an active restless Crustacean, darting and whirling 

 forwards and backwards, and frequently producing a loud clicking noise by snapping the 

 claws of their fore-legs, in the manner of Callianassa and Sqidtta. Specimens were found 

 under nearly every stone which I turned on the beach at low water. The Gonodactyli 

 appear to differ slightly from the Squillee in their habits, inasmuch as they are generally 

 found in deeper water, whereas the Squillee affect the shallow, weedy, and sandy bottoms, 

 within coral-reefs and on flat beaches, where they hide in holes of the banks of pools, across 

 which they dart occasionally in straight lines, leaving a turbid track behind them. Both 

 genera have, however, the same power of producing a loud clicking noise with the claws of 

 their fore-legs, and of inflicting very severe wounds with their chelae, using them in a 

 scythe-like manner, like the Mantis which they resemble. The Trapezia are tolerably lively 

 in their habits, with the same manner of hiding and shuffling under stones as the Porcellance, 

 but unlike them they inhabit the coral branches and madrepores of deep sunken reefs. 



