454 BULLION. 



cloven and causing a disconnexion of the outer whorl from the 

 next : inner Up narrow, folding over the pillar, behind which 

 is a depression or approach to an umbilicus . L. 1 . B . 75 . 



HABITAT : With P. catena at Exmouth (Clark) ; Tor- 

 bay (Clark and J. G. J.) ; Burrow Island, near Saltash 

 (Barlee and Hanley); Land's End and Hayle (Hockin); 

 Whitesand Bay and Guernsey (J. G. J.) ; Scarborough 

 (Bean and J. G. J.); Northumberland coast, with P. 

 catena, " rarely found alive in pools among the rocks 

 within tide-marks " (Alder) ; bays near Swansea, 

 Barmouth and Bundoran (J. G. J.) ; Miltown-Malbay, 

 co. Clare (Harvey); Kilkee in the same county, and 

 Bundoran (Mrs. Hancock, fide Thompson) ; Bantry Bay 

 (Norman) ; Dublin Bay (Warren and B. W. Adams) ; 

 Cumbrae (Landsborough and Robertson); The Minch 

 (J. G. J.); Loch Maddy (M'Intosh) ; Aberdeenshire 

 (Macgillivray and Dawson); off Troup Head on the 

 same coast, in 60 f. (Thomas, fide F. & H.) ; Shetland 

 (J. G. J.). Floroen in Norway (Sars, as P.pusilla); 

 Bohuslan (Malm, as P. quadrata) ; Algiers, 35 f. (M f An- 

 drew); ^Egean, 119 f. (Forbes, as Bullcea alata). An 

 examination of the types has enabled me to determine 

 the above synonyms. 



B. Sculpture latticed ; spire conspicuous. 

 ?m> 6. P. pRUiNo'sA*,(Clark:) rf . ^Si 



Bullcea pruinosa, Clark in Zool. Journ. iii. p. 339. P. pruinosa, F. & H. 

 iii. p. 549, pi. cxiv. F. f. 1, 2. 



BODY oblong (" convex above, flat beneath," Clark ; " parum 

 depressum," Loven) ; it is white, the tentacular disk and all 

 the margins being speckled with snowy points : mantle open 

 along the back, extended behind, and indented in the middle ; 



* Like hoar-frost. 



