PSAMMOBIA. 395 



Habitat : In fine sand, at from 15 to 85 fathoms, off 

 Guernsey (Turton, Metcalfe, Hanley, and Barlee); Tor bay 

 (Turton) ; Exmouth (Clark) ; Goran and Port Cnrno 

 Cove, Cornwall (Peach and Miss Lavars) ; Birterbuy 

 Bay, co. Galway (Walpole); Cork (Humphreys) ; Belfast 

 Bay (J. G. J.) ] Ayr (J. Smith) ; Skye (Barlee) 3 Shet- 

 land ( M f Andrew, Barlee, and J. G. J.). I observed a 

 specimen in Mr. Searles Wood's collection in the British 

 Museum mixed with P. tellinella, and marked " Coral- 

 line Crag " j Apulia (Philippi). Sars has recorded it 

 from Christ iansund, and Lilljeborg from another part 

 of the Norwegian coast; M f Andrew has dredged it 

 off Gibraltar, Madeira, the Canaries, Mogador, Gulf of 

 Tunis, Algiers, Balearic Isles, and Pantellaria, at depths 

 varying from 3 to 60 fathoms ; Martin has taken it in 

 the Gulf of Lyons ; Requien has enumerated it as a 

 Corsican shell ; Philippi described it as Sicilian ; "Coasts 

 of Greece (Graves and Spratt)," according to Forbes and 

 Hanlev. The number and extent of the localities above 

 mentioned on the authority of Mr. M f Andrew are proofs 

 of the energy and scientific skill with which his dredging 

 operations have been conducted throughout a great part 

 of the European seas. His tabulated results have been 

 of the greatest service to me in the preparation of this 

 work. 



The animal is not less agile than that of P. telli/iella, 

 occasionally leaping like Donax vittatus and repeating 

 the action three or four times in succession. The shell 

 does not appear to attain quite the same size as the 

 other species ; my largest specimen is only half an inch 

 long and nine-tenths of an inch broad. 



Philippi at first gave this species the name of P. dis- 

 cors, but afterwards substituted that which had been 

 previously published by Turton. 



