454 BULLlD.Ti:. 



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. 0- 1 . B. 0'075. 



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

 1)ay (Clark and J. G. J.) ; Burrow Island^ near Saltasli 

 (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, y?^e Thompson); Bantry Bay 

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

 Cumbrae (Landsborough and Robertson); The Minch 

 (J. G. J.) ; Loch INIaddy (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^An- 

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

 examination of the types has enabled me to determine 

 the above synonyms. 



B. Sculpture latticed ; spire conspicuous. 

 6. P. PRUiNo'sA"^, Clark. 



Bullcsa pruinosa, Clark in Zool. Journ. iii. p. 330. P.prui7iosa,¥. & II. 

 iii. p. 549, pi. cxiv. r. 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 mth snowy points : mantle open 

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



* Like hoar-frost. 



