ON THE GEOGRAPHICAL AND BATHYMETRICAL 



DISTRIBUTION 



OF THE SPECIES OF SYNALPHEUS Sp. Bate AND ALPHEUS Fabr. 

 COLLECTED BY THE SIBOGA EXPEDITION. 



Synalpheus Sp. Bate. 



I have indicated at pages 1 88 and 189 that we know at present that some species of the 

 o-enus Synalpheus are sedentary animals, living in sponges, corals etc. and that they are not free 

 swimming. In order to further the possibility of drawing general conclusions about the habitat 

 and manner of life of the species of this genus, I have tried to gain some information from 

 the occurrence of the "Siboga" species. I refer to the List of Stations (page 446) indicating at 

 which Synalphei were collected by this expedition, being at the same time a List of the species 

 collected at each station. 



This List teaches us that the 38 species and 9 varieties brought home by the "Siboga" 

 were collected at 49 different stations. 



At 1 7 stations specimens were taken on coralreefs at low water tide under and between 

 pieces of coral or by breaking the latter with a hammer or otherwise. They belonged to the 

 following 1 5 species and varieties : 



Syn. bituberculatus de Man 



Syn. carinatus (de Man) 



Syn. carinatus (de Man) var. ubianensis 



Syn. Charon (Heller) [de Man 



Syn. consobrinus de Man 



Syn. hastilicrassus Cout. 



Syn. Heroni Cout. 



Syn. hilarulus de Man 



Syn. m odes tus de Man 



Syn. paraneomeris Cout. var. halmaher ensis 



de Man 

 Syn. paraneomeris var. pracdalmndits de Man 

 Syn. paraneomeris var. prolatus Cout. 

 Syn. streptodactylus Cout. 

 Syn. Theophane de Man 

 Syn. tumidomanus (Paulson). 



Both Syn. paraneomeris Cout. var. prraedabundus de Man and Syn. streptodaetyhts Cout. 

 were caught at 4 different localities, the other species only at one or two. Those printed in 

 heavy type have also been collected on Lithothamnion banks or at least on a bottom covered 

 with pieces of Lithothamnion and corals. This appeared to be a kind of bottom exceedingly 

 favourable to an abundant occurrence of Synalphei. 



3°9 



