MARSHALL; ADDITIONS TO "BRITISH CONCHOLOGY." 47 



dredged in the Kyles of Bute in i8f., was mistakenly recorded by me 

 as R. cimex} It is much larger and more coarsely sculptured than 

 the type. 



R. jeffreysi Wall. — Flugga Light, North Shetlands (Simpson) ! 

 The first two whorls are transversely reticulated, similar to the em- 

 bryos of Clathiirella and Ovula. 



R. abyssicola Forb. — Ofif Loch Ryan, 2 7f. ; Mull of Cantire, 

 26f. Also Straits of Korea, 4if., 3i-i4N., I28-55E. ('Sylvia') I 



R. zetlandica Mont. — Benbecula Sound, lof. ; North Rona, 24f. 

 R. COStata A. Ad.— Off Loch Ryan, 25f ; Kilbrannan Sound, 25f. 



R. parva var. semicostata Jeff., non Mont. — There is a suppo- 

 sition that R. semicostata Mont, is not a variety of R. parva, but a 

 prior name for R. inconspicua, especially as Montagu gives its dimen- 

 sions as " half a line," though that measurement would not apply to 

 either species. But whatever Montagu's species was, authors appear 

 to have been unable to make anything of it, and simply ignore it. Only 

 Captain Brown attempts to describe and figure it after Montagu," 

 but the description would apply to several species, the dimensions 

 given are " one-sixteenth inch," and the figures do not represent any 

 form of ^. inconspiciia, but dwarf or immature R. parva. I am quite 

 of opinion that Montagu intended what we now call R. inconspiaia to 

 be his R. semicostata ; but he was not sufficiently clear in his diag- 

 nosis, and that is fatal to his claim. 



var. exilis Jeff. — I have some doubt regarding this variety. I 

 have not seen Jeffreys' specimens from the Shetlands on which he 

 founded it, but a series from Falmouth which he examined and named 

 for me many years ago under that name I have since found to be 

 the smooth form of R. iticonspicua. At the same time, specimens 

 from all the other localities recorded by me for var. exilis^ answer to 

 his description of that variety. 



R. albella Lov. — Dartmouth. The type and its variety sarsii 

 Lov. are admirably represented in Forbes and Hanley's figures — the 

 former as R. iticonspicua var. albtda,'*' and the latter as forms of R. 

 inconspicua} 



(To be continued). 



Joitrn. of Conch., 1889, voL ix., p. 136. 

 Illust. Rec. Conch., p. 11, pi. ix., figs, i, 2. 

 Jou7-7i. of Conch., voL ix., p. 129. 

 Brit. Moll., pi. Ixxvi., figs. 7, 8. 

 Brit. Moll., pi. Ixxxii., figs. 7, S, 9. 



