MARSHAT,]. : ADnri'IOX.S TO " RRITISH COXCIIOLOOY. 45 



pearl has been found in this species, or, indeed, in any British marine 

 univalve." But this addition is untenable. Although Mr. Coates' 

 find is an interesting one, it is not unique. Gwyn Jeffreys' has 

 written — s" I have a pearl which was extracted from the common 

 periwinkle ; it is round and white, and one-tenth of an inch in 

 diameter." I know of a similiar instance, and there is also the case 

 of another marine species (^Haliotis tuberciihitd) producing pearls, a 

 note of which I have already published in this journal. " 



Rissoa Frem.^ — The minute breaking-up of this well-defined genus, 

 despite the protest of authors, is much to be deplored. The authors 

 mentioned, whether right or wrong, are not so obscure that they may 

 be passed over in silence and have their conclusions ignored, nor are 

 their fellow-authors or critics so superior as to be above condescend- 

 ing to notice them. But until some reason is assigned for neglecting 

 to reply to arguments which are at least worth the attention of serious 

 writers and naturalists, little heed need be paid to the advocates of 

 change for mere change sake. 



Rissoa Striatula Mont. — Lamlash (Norman); Silvercraigs, Clyde 

 (A. Brown) ; Achil Island. 



var. ecarinata Monts. — Killala Bay. 



R. lactea Mich. — Whitesand Bay, a dead and rolled specimen 

 on the beach. Whitesand Bay is on the Cornish side of Plymouth, 

 and I suspect this specimen had a similar origin to several others 

 which I found near Fowey, in Cornwall, many years ago.^ But I 

 should not be surprised to hear of its occurrence at the Scillies or the 

 Land's End. It is very plentiful in parts of Jersey, where it was 

 first discovered by the late Mr. Sylvanus Hanley, who used to relate 

 an amusing episode in connection with it. Just as he pounced on his 

 first specimen, he was startled l:)y a gun-fire, and could not realise for 

 the moment whether it was to celebrate his discovery or to punish 

 his excessive jubilation, but on looking up he was horrified to find 

 that all the guns of the fort were (as he supposed) pointing at him ; 

 and so they were, but it was only a coincidence that he happened to 

 be in the line of blank fire, consequendy he escaped with life, and 

 with his Rissoa. 



R. cancellata DaCos. — Achil Island; Mull of Cantire, 22f. ; Kil-^ 

 brannan Sound, 2 5f. 



In Jeffrej's' figure the spire is too short and pinched up ; Sowerby's 

 is right. Var. hirta Monts. is "distinguished by two riblets on the 



1 Brit. Conch., vol. iii., p. 373. 



2 Adds, to Brit. ConoSx., J ourn. 0/ Conch., 1915, vol. 14, p. 325. 



3 Adds, to Brit. Conch., Jotirn. of Conch., 1898, vol. ix., p. 124. 



