3o6 JOURNAL OF CONCHOLOGY, VOL. I3, NO. lO, APRIL, I912. 



P. nivalis Lov. — S.W. Ireland 2i4f. (R.I. A. eruise) ! off the Shet- 

 lands iiif. (Simpson) ! N.N.W. of Unst, 90-1 2 6f. (Jeffreys). Canon 

 Norman cites " ' Porcupine,' 1869, N. of Hebrides, lyof.,'" but explains 

 in a footnote that "Jeffreys does not give the Station, and that depth 

 is not recorded from any Station." The Station was IX. of the 

 'Lightning' cruise, and the depth lyof.; it is not marked on the chart 

 accompanying the Report, but is situated close to Station X. of that 

 cruise, and is extremely interesting as being situated on a bank of a 

 very limited area, with a bottom temperature of 417 degrees, in the 

 midst of the deep and icy waters of the Shetland-Faroe Channel. 



P. carinata Biv. — Fifty miles off the Butt of Lewis, iSgf. 

 (' Lightning' Exp.); 40 miles off Valentia, iiof., and Atlantic off 

 Scilly, 69of. ('Porcupine' Exp.); off the Butt of Lewis 545f., and 

 also midway between the Shetlands and Norway i97f. (Simpson) ! 

 Canon Norman cites "'Porcupine,' 1869, N. of Hebrides; probably 

 Station 85, f9of., as the depth given by Jeffreys (i89f.) is not given 

 for any Station ; " but the exact locality and depth and expedition are 

 the first I have named. This is the P. modiola of Crist, and Jan. 



P. rufa Mont. — Extremely variable as to the number and 

 flexuosity of the ribs. The topmost whorl is quite smooth and 

 glossy ; the second and third are evenly reticulated, in consequence 

 of the spiral lines being equal in size and space to the longitudinal. 

 It is rather common in the Channel Islands. 



Var. lactea Jeff. — St. Fergus, Aberdeen, a dead specimen from 

 the shore (Simpson) ! Jersey and Herm ; lona, i5f., a dwarf form ; 

 Frith of Lome, 75f. The vars. angusta and cranchii are also 

 occasionally white, and there are also pale brown, light yellow, and 

 bicolored forms — all from the Channel Islands. 



Var. semicostata Jeff. — Freshwater West (Span) ! Alderney 

 (Marquand) ! Sutton-on-Sea, Lincolnshire. 



Var. ulideana Thomps. — Guernsey, Sutton-on-Sea, Dublin Bay, 

 lona. This variety is often broader than the type. 



Var. cranchii Brown. — Channel Islands. 



Var. angusta Jeff. — Channel Islands ; Belfast Lough. 



Var. praelongfa yL^x^\^., Joum. of Conch., 1893, vol. vii., p. 262. — • 

 Freshwater West (Span) ! Guernsey, 2of., rare ; Alderney 

 (Marquand) ! 



Var. ecostata Marsli., op. cit., p. 263. — Lynn Deeps, 4of. 



F. rufa has many resemblances to P. pyramidalis Strom ; not only 



the typical form, but all its varieties have representatives in the latter 



species. P. pyramidalis is one of our Crag and post-tertiary fossils, 



and as recent it was dredged by the ' Lightning' 50 miles off the Butt 



of Lewis in i89f. ^^ , 4- j\ 



^ (To be conitnued). 



I Ann. Mag. N. Hist., 1899, vol. iv., p. 135. 



