454 BULLID.E. 



cloven and causing a disconnexion of the outer whorl from the 

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

 is a depression or approach to an umbilicus. L. 0-1. B. 0*075. 



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, u 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, ^e Thompson); Bantry Bay 

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

 Cumbrae (Landsborough and Robertson); The Minch 

 (J. G. J.) ; Loch Maddy (Mlntosh) ; Aberdeenshire 

 (Macgillivray and Dawson); off Troup Head on the 

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

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

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

 drew); iEgean, 119 f. (Forbes, as Bullaa alata). An 

 examination of the types has enabled me to determine 

 the above synonyms. 



B. Sculpture latticed ; spire conspicuous. 

 6. P. pruino'sa"*, Clark. 



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

 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. 



