223 



JOURNAL OF CONCHOLOGY. 



Vol. 13. OCTOBER, 1911. No. 8. 



ADDITIONS TO "BRITISH CONCHOLOGY." 



By J. T. MARSHALL. 



Part VII. (conthmed from page 2op). 



F. gracilis DaCosta. — South Devon is the limit of this species, 

 wliere it becomes rare. The Alderney record^ was an error — a very 

 pardonable one. I have seen Mr. Marquand's shell, and it proves to 

 be a worn and broken specimen of Bitcciniiin uiidattun, stained brown 

 by age, worn smooth by rolling, and the broken aperture reconstructed 

 with the leathery integument of another marine animal. 



var. convoluta Jeff — Scilly Islands (Smart and others) ; the 

 Smalls Light (Span) ! and various other places, but sparingly. Variable 

 in length and slenderness. My largest are 3^-in. in length by i-in. only 

 in the widest part, and have a deeply-channelled suture. A dwarf 

 form from the Shetlands is half this size, with a finer apex, the young 

 of which have the same proportions and miglit easily be mistaken for 

 F. propifupais var. titrfUa, but they are more coarsely sculptured. 

 Some Scillonian specimens have a light yellow epidermis, with the 

 sculpture less marked. This variety is well illustrated by Forbes and 

 Hanley (pi. ciii., fig. 3), and by Captain Brown (pi. vi., figs. 7, 9). 



var. belliana Jord. {Joum. of Conch., 1890, vol. vi., p. 232). — 

 Larger and broader. Off the Wexford and Waterford coasts, 2o-3of 

 (Jordan and others) ; off Galley Head, S. Ireland (Wotton) ! deep 

 water off Montrose, Aberdeenshire, and Flugga Light, North Shetlands 

 (Simpson) ! Doggerbank, 3of ; Moray Frith, 24f. This is the form 

 figured by Forbes and Hanley (though not the type) as " dredged 

 from the Doggerbank at the depth of 5of."'-^ 



var. COulsoni Jord. {Joiirn. of Conch., vol. vi., p. 232, 1890). — 

 Smaller and narrower ; the usual deep-water form. Shetlands, from 



1 Marquand, " Marine Shells of Guernsey," Trans. Guerns. Soc. Nat. Sci., 1901, p. 14 

 (separate copy^. 



2 Brit. Moll., vol. iii., p. 418, pi. ciii., fig. i. 



