viii INTRODUCTION. 



Many species of Idotea and Iara would appear to inhabit the sea-weed along the shores, as 

 well as that found floating on the high seas. At the island of Quelpart, I found a large and 

 singular species in considerable numbers in the former situation, and in the Sea of Celebes 

 I met with several new forms among algse far from land. Off Tampassook in Borneo, to 

 which island we again returned, several Ix<e were obtained by the dredge, one of which (our 

 I. megaspis) was new to science ; they inhabit very deep water, and are inactive and feeble. 

 Near the same part of the coast several specimens of Partkenqpe, which simulated death 

 when taken, and species of Lambrus and Arcania, which have similar habits, likewise were 

 obtained from a rocky bottom by means of the dredge. Off Balambangan, our new genus 

 Ceratocarcinus was procured from twelve fathoms water ; and at Unsang, on the east coast; 

 another new genus, our Cosmonotus, was dredged among the clear sandy pools within the 

 reef-barrier, which extends along a part of the coast ; and near the mouth of the Pantai River 

 a third new genus, our Zebrida, rewarded our research, the habits of which Crustaceans are 

 alluded to in the following pages. On the return of the Samarang across the Atlantic, at 

 which we have now arrived, Erichthi and Alimce, with their spiny carapaces and elongated 

 abdomens, were obtained, by trawling, in large numbers, swimming in an erratic manner on 

 the surface when the water was calm. Among the vast quantities of Acalephce which 

 became entangled in the trawls, were several containing living Phronima, which, on being 

 extricated, swam freely about. Here also was obtained, at the same time as Nemichthys of 

 Richardson, 1 our new genus Rhabdosoma, which swims by suddenly straightening its body 

 when in a bent position, moving either backwards or forwards ; it is sluggish in its move- 

 ments compared with other Hyperiada. The Phyllosomata, diaphanous and sluggish of 

 movement, were frequently assembled during this calm by many thousands on the surface 

 of the Atlantic, and, together with numbers of anomalous Zocecs, afforded ample amusement 

 during the protracted passage. Among the Entomostracous Crustacea, several specimens of 

 Cypridinae of large size (C. Adamsii, Baird 2 ) were obtained, as they were revolving and 

 darting about the surface. The specimens described and figured in the following pages are 

 deposited in the British Museum. A. A. 



1 Vide Fishes, PI. X. Fig. 1. 2 Ann. and Mag. Nat. Hist., 2nd Ser., vol. i. p. 21. 



