THE MARINE INSECTA, ARACHNID A, AND MYRIOPODA 183 



Of the Aranea (or true " Spiders ") we have at least one 

 species, although I think the only record of it is mine. 

 A specimen was found by my wife in a tuft of coralline, at 

 extreme low tide, in St Clement's Bay. It was identified 

 for me by the arachnologist of the British Museum, in 

 which institution the specimen now is. 



The Myriopoda (Millepedes, etc.) are represented by 

 three species of Geophilus (one of which is my record). 

 They are about two inches long, and live in rock crevices 

 at all ranges of the tide. They resemble the common land 

 form, but are darker in colour, and have fewer legs. The 

 land species (Geophilus maxillaris and Geophilus electricus) 

 have fifty-five and seventy-four pairs respectively, the 

 marine ones about forty. 



The forms named in this chapter present an interesting 

 problem. They are land animals taking to a life in the 

 sea, in reversal of the grand march, which has been from 

 sea to land. 



There is much scope for research for the young naturalist 

 among the dwellers of the rock crannies between tide marks. 



Among the rocks and stones at that part of the shore 

 which is not covered by the tide there is another interesting 

 fauna, and a chapter will be devoted to it later on. 



