ADDITIONS TO "BRITISH CONCHOLOGY." 



(Continued from page 128). 



By T. T. MARSHALL 



Eulima bilineata Alder (contimied). 



Var. albida Marsh, n.var, — Ground colour of the shell whitish, 

 without coloured bands. I have this from the Scilly Islands, 40 f., 

 and N. Rona Island, 24 f. ; Adventure Bank, Mediterranean, 92 f. 

 (" Porcupine") ! and the same district in 120 f. ("Shearwater") ! 



Var. exigua Marsh. ( / Conch., vol. 7, p. 258, 1893). — ^"^ this 

 variety, which is found only occasionally with the type, the spire is 

 proportionally slimmer, more so than a young E. subulata of the same 

 size. A figure of it will be found in "British Mollusca" (pi. 92, fig. 9). 

 It differs from E. Jeffrey siana, Avhich is of similar size and proportions, 

 in that the latter is more regularly conical in the spire, more pointed, 

 in the base, and without bands. Var. exigua was dredged by the 

 "Porcupine" off the Island of Pantellaria in 390 f., and by the " Sylvia " 

 in the Straits of Korea in 20 f. E. subulata has a corresponding form 

 (var. nana Jeffr.), but that is not found on the British coasts. 



Natica Adans. — All the species of British Naticid^ have a horny 

 operculum with the exception of N. affinis, in which it is calcareous ; 

 in all the sexes differ, and are easily recognisable, the males having a 

 smaller body-whorl, a narrower mouth, and a more produced spire. 



N. islandica Gm. — St. Andrews (M'Intosh); Sutherlandshire, 

 from fish stomachs (Baillie) ! Doggerbank, 40 miles N.E. by E. from 

 Scarborough, 35 f. ; West Orkneys, 45 f. ; and North Rona, 24 f. 



Specimens from the Shetlands belong to the Arctic form, and are 

 considerably larger and have a more elongated spire than those from 

 other parts of the British coasts and from the Crag formation ; the 

 usual size of the two latter is half-an^inch in length. Jeffreys figures 

 the Shetland form, and Sowerby the more usual British coast one. 



N. groenlandica Beck. — Aberdeenshire (Simpson) ! 50 miles off 

 Peterhead (" Triton ") ! Doggerbank, 30 miles off Scarborough, not 

 uncommon. 



This species is globosely oval, and always longer than broad. Both 

 Jeffreys' and Sowerby's figures indicate the shell of the female, while 

 Forbes and Hanley figure a half-grown specimen of the male. I de- 

 scribed the animal in 1875.^ 



N. SOrdida Phil. — St. Bride's Bay, very fine (Wilkinson) ! Suther- 

 landshire, from the stomach of a haddock (Baillie) ! The colour of 

 this species is every shade of brown, but specimens from Fetlar Island 

 are fawn-coloured. 



I "North Sea Dredging," Ann. and Ma§;. Nat. Hist:, ser. 4, vol. 16, p. 393, 1875. 



