Mr. J. G. Jeffreys on some British Shells. 351 



my thanks to the Rev. Dr. Fleming, Professor Macgillivray, Mr. 

 Hanley, Mr. Metcalfe, Mr. Alder, Mr. Bean, Mr. MacAndrew, 

 the Rev. G. M. Beevor, Dr. Battersby, and my zealous fellow- 

 labourer Mr. Barlee, for the kind assistance they have afforded 

 me in ray examination of their collections as well as the trans- 

 mission and use of their specimens for comparison. 



XXXYII.— Notices of British Shells. By J. G. Jeffreys, F.R.S. 



Rissoa pulcherrima. 



Shell ovato-conical, thin, semitransparent, smooth and some- 

 what glossy, of a yellowish colour, marked on each whorl with 

 four equidistant rows of reddish brown spots (about twelve in 

 each row) which are generally confluent on the upper row, giving 

 it a streaky appearance ; whorls 4|, convex and rather swollen, 

 the last being about half the size of the spire ; apex blunt ; su- 

 ture deep and distinct ; base broad and spread ; aperture round- 

 ish; peristome detached and simple, slightly thickened on the 

 pillar side; umbilicus small but deep ; length g^j, breadth -^-^ of 

 an inch. 



Several specimens of this exquisite little shell were found by 

 Mr. Barlee at the roots of Corallina officinalis on the shores of 

 Guernsey and Sark. 



Rissoa (?) opalina. 



Shell ovato-globose, thin, transparent, very smooth and glossy, 

 of a brownish colour and prismatic lustre ; whorls 3, convex, the 

 last exceeding in size Jths of the spire ; suture distinct ; apex 

 blunt and rounded ; aperture roundish oval, large ; outer lip of 

 the peristome thin, and not reflected or margined; inner lip 

 rather straight and thickened, not detached from the pillar; 

 umbilicus forming a narrow groove behind it ; operculum horny, 

 thin, concentrically striate, and having its nucleus on the side 

 next the pillar-lip ; length ~q, breadth ~j of an inch. 



It is probably allied generically to Turbo nivosus of Montagu 

 {Rissoa glabra of Alder, not Brown), but the animal is not 

 known. 



At the roots of Corallina officinalis on the shores of Guernsey 

 and Sark (Mr. Barlee) : rare. 



