192 Mr. Jeffreys on British Mollusc'a. 



Astarte compressa, i. 464. I found single valves of the smooth 

 variety, with Astyiis Holbollii, by dredging off Larne on the north- 

 eastern coast of Ireland, in about 25 fathoms. The ribbed and 

 convex form (A. globosa of Moller) occurs as a pleistocene fossil in 

 the neighbourhood. See notice (post) of Margarita cinerea. 



A. triangularis, i. 467- The non-crenation of the margin does 

 not depend on age (as supposed by the authors of the 'British 

 Mollusca'), for I possess specimens which are evidently adult and 

 of the same size, some of them having the margin quite plain, while 

 in others it is strongly crenulated. 



Cardium edule, ii. 15 ; var. ovalis, compressa, margine antico sub- 

 recto. Herm (Dr. Lukis). This variety is as remarkable as the 

 C. rusticum of authors. 



C. punctatum (C. nodosum, ii. 22). Gorey, Jersey ; very fine 

 (Rev. A. M. Norman). 



C. fasciatum, ii. 25. Some specimens from Zetland show decided 

 punctures in the interstices of the ribs, which are apparently caused 

 by the concentric wrinkles being more than usually crowded together 

 in this part. 



C. pygmreum, ii. 29. Gorey, Jersey {Rev. A. M. Norman). 



Lucina borealis, ii. 46. There are two distinct forms or varieties 

 of this species : one is compressed, with few and distant ribs ; and 

 the other is gibbous and smaller, with the ribs more numerous and 

 close together. The last variety has been taken by Mr. Norman in 

 Bantry Bay, and by myself in Guernsey. 



L. leucoma, ii. 57. Jersey, at low water (Rev. A. M. Norman). 



Sphrerium rivicola (Cyclas rivicofa, ii. 111). Beeston Brook, near 

 Liverpool; Surrey Canal; Minchinhampton ; Devizes (Mr. Webster). 



S. ovale. M. Bourguignat, in his Monograph on the French 

 species of Spkeerium (p. 31, pi. 6. f. 6), refers this species, which was 

 founded by Ferussac, to the Cyclas lacastris of Draparnaud, — the* 

 Tellina lacastris of Muller being a different species, and identical 

 with the Cyclas calyculata of Draparnaud. It is the Sphcerium 

 pallidum of Gray. 



Dreissena polymorpha, ii. 165. Mr. Bailee informs me that it 

 abounds in the river Witham in Lincolnshire, five miles from the 

 sea ; and that the river is not navigable by vessels above half a mile 

 from Boston, where there is a sluice and lock to keep out the tide. 

 It is more than probable that this species is indigenous to Great 

 Britain, and was not originally imported from the Continent. 



Mytilus edulis, ii. 1 70. The epidermis in young individuals is 

 clothed with short hairs, which in after-growth appear to fall off. 

 This is another link which unites the genus to Modiola. 



Modiola radiata (M. tulipa, ii. 187). Jersey (Rev. A. M. Norman). 

 The large variety from Falmouth has been lately figured by Mr. 

 G. B. Sowerby, in his very useful work entitled 'Illustrated Index 

 of British Shells ' (pi. 7. f. 7), as a distinct species, under the pro- 

 visional name of Modiola oralis. If the normal form be found 

 with it, the distinction may be a good one, as I am not aware that 

 anv intermediate variety has been discovered. 



