48 MARSHALL : ON THE BRITISH SPECIES OF BUCCINUM, FL'SUS, ETC. 



from the Doggerbank, and measure 4;j-in. by i|-in. Four prominent 

 ridges (sometimes only three) encircle the periphery of each whorl. A 

 specimen from the Doggerbank is peculiar in having the very different 

 smooth and spiral embryo of F. norrenirux. 



Var. eleiianx, Jeffr. — East Shetlands 70 f. (Simpson and others) ! 

 North of Unst (Jordan) ; Doggerbank 30 f., North Rona 45 f., and 

 East Shetlands 100 f. Also N. of Hebrides 530 f. ("Knight Errant"); 

 Shetland Faroe Channel 608 f. and 640 f. ("I'riton"); between the 

 Hebrides and Faroes 155-632 f. ('' Porcupine.") L. 4-in., b. if-in. 

 This lives with the type on the Shetland deep-sea fishing-grounds, 

 whence Barlee and Jeffreys first procured it, and I have several speci- 

 mens from the same locality. From the same region I have a full)' 

 adult specimen which is only half the usual size — 2i-in. by ig-inch. 

 Another variety (') with more tumid whorls and shorter spire, has been 

 dredged by the " Porcupine " 50 miles west of theShetlands in 203 f., and 

 north of Scotland in 290 f. (Jeffreys), but which does not differ, except 

 in texture, from var. ifollda, G. O. Sars (■'). I have two specimens 

 that may pass for either of these varieties, one from the Shetlands and 

 the other from the Doggerbank. All three varieties gradually merge 

 from the type, and are only the extreme forms common to all the Fiism 

 family, and indeed to all univalves. 



F. FENESTRATUS,Turt. — The Minch 72 f. ayoungspecimen(J.T M.); 

 S. of Ireland no f. (E. A. Smith) ; S. W. Ireland 50 fi (R. I. A. cruise),; 

 Channel slope 539 f., off Cape Clear 180 f., S. of Ireland 725 f. and 

 W. of Ireland 90 f., ("Porcupine"); off the Butt of Lewis 530 f. 

 (" Knight Errant") ; Shetland-Faroe Channel 530 f. ("Triton "). Two 

 or three specimens have also been trawled in recent years between the 

 Pembrokeshire and Waterford coasts ; one of these is 2|-in. in length, 

 and has seven whorls besides the apical ones ; but for many years pre- 

 viously the only specimens known had their source from old Mr. 

 Humphrey's, the dealer, of Dublin, who obtained altogether during his 

 career eight specimens, one of which is in my collection. My young 

 specimen from the Minch has only 3^ whorls, but is interesting as 

 showing the embryonic sculpture, which is usually worn down in the 

 adult. The first whorl is quite smooth, the second has spirals only, 

 and the third initiates the longitudinals and spirals which characterise 

 the adult. Gwyn Jeffreys gives an excellent figure, but Sowerby's is 

 not like. F. /(mcdrafux was also dredged by the " Porcupine " off the 

 coast of Portugal in 220 f. 



(2) Var. in/ata, Jeffr., " Valorous" Moll., Ann. Mag. N. Hist., 1877, P- 327- 



(3) Moll. Reg, Arct. Norv., p. 278, tab. 14, fig. 2. 



