450 BULLID.E. 



base : outer lip flexuous, slightly indented or concave in the 

 middle ; the top is level with the spire, the shell being placed 

 month downwards ; inner corner cloven, and producing the 

 same partial disconnexion of the body -whorl as in the last 

 species : mner lip forming a broad and thickened glaze. L. 0-15. 

 B. 0-1. 



Var. zona. Rather more depressed, with a belt of clear 

 white in the middle, taking in from eight to ten of the chain- 

 like rows. 



Habitat : Exmouth, alive in rock-pools at the time 

 of the lowest spring tides (Clark ) ; on different parts 

 of the coasts of Sonth Devon^ Cornwall, and Dorset 

 (Montagu, Tyacke, fide Forbes's MS., J. G. J., and 

 others) ; Guernsey (Barlee and J. G. J.) ; Tenby (J. 

 Adams and J. G. J.) ; Manorbeer near Tenby, and 

 Langland Bay near Swansea (J. G. J.) ; Scarborough 

 (Bean and J. G. J.) ; Northumberland (Alder) ; Ber- 

 wick Bay (Johnston) ; Cork (Humphreys, from the 

 stomach of a sole, and J. G. J.) ; Miltown-Malbay, co. 

 Clare (Harvey, fide Thompson) ; Arran Isles, co. Gal- 

 way (Barlee) ; Bundoran, co. Donegal (J. G. J.) ; Dub- 

 lin Bay (Walpole and J. G. J.) ; Lamlash, Isle of Bute 

 (Landsborough) ; Skye (Barlee); Firths of Forth and 

 Clyde (Brown) ; Shetland (Barlee) . The variety is 

 from Bigberry Bay, near Plymouth (Montagu), and 

 Guernsey (coll. Turton and J. G. J.). P. catena occurs 

 in the Coralline Crag at Sutton (Wood, as Bullaa 

 sculpt a) ; Palermo (Calcara, as B. punctata). Its extra- 

 British distribution, as a recent species, appears to be 

 southern, and comprises the Loire-Inferieure (Cailliaud), 

 Mediterranean, from the Gulf of Lyons (Martin) to 

 Sicily (Maravigna and Philippi), and^gean, in 119 f. 

 (Forbes). 



The gizzard resembles that of P. scabra, but is 

 smaller and has a shorter midrib. My largest specimens 



