MARSHALL : AUDITIONS TO BUITISH CONCHOLOGY. 227 



though the epidermis is usually smooth," for some F. jeffreysianus are 

 certainly hispid even to the unaided eye. It is quite true that the 

 young and fry "are as distinct from those of F. propinqtms as the 

 adult of each from the other," but neither is that a specific test. (It 

 is curious, by the way, that in shape the young are the reverse to 

 the adult shell, those oi F. jeffreysianus being long and narrow, while 

 those of F. propinqiius are short and stumpy). The shell becomes 

 larger and more solid as it proceeds south, and attains its greatest 

 development in Torbay and at Exmouth, my largest thence being 

 2|-in. by ij-in., while the smallest, from the south of Ireland and the 

 Pembrokeshire coast, are i|-in. by |-in. All the published figures 

 correctly represent the shell, the best perhaps being those of Captain 

 Thomas Brown, ^ who was the first to figure it, though mistakenly as 

 the last species. His description, however, is unreliable, and he says 

 a specimen was "found at Seaton, Northumberland, by Walter 

 Trevelyan, Esq., and is in the cabinet of Sir John Trevelyan, at 

 AVallington ;' but the figures are undoubtedly those of F Jeffrey siafiiis, 

 and of the South Devon form. Sir Walter may without doubt have 

 picked up a specimen of F. propinqiius at Seaton, but that cannot be 

 the shell figured by Brown, and it is surprising to find Gwyn Jeffreys 

 and others failing to recognise these figures. Sowerby figures the 

 Irish form well. 



F. berniciensis King. — Aberdeenshire (Simpson and others) ! 

 Channel slope 539 f (' Porcupine'); Atlantic off Ireland 345 f (R.I. A. 

 cruise) ! Shetland-Faroe Channel 570 f. ('Triton'). The finest come 

 from the Doggerbank, and measure 4|-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. norvegicus. Gw)'n Jeffreys' 

 figure is drawn out of scale : the spire is too slender and the last 

 whorl too short and distended. Sowerby's figure has the same faults. 



var. elegans Jeff. — East Shetlands 70 f (Simpson and others) ! 

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

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

 Shetland-Faroe Channel 680 f. and 640 f. ('Triton'); between the 

 Hebrides and Faroes 155-632 f. ('Porcupine'). L. 4-in., b. i|-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 fully 

 adult specimen which is only half the usual size — a^-in. by ly-in. 

 Another variety," with more tumid whorls and shorter spire, has been 



1 lllust. Rec. Shells, 2nd ed., 1845, p. 8, pi. vi., figs. 11, 12. 



2 Var. in/lata, Jeflf., 'Valorous' Moll., Ann. Mag. N. Hist., 1877, p. 327. 



