TOMLIN : MARGINELLA IN THE MARRAT COLLECTION. 45 



lip, as its name is intended to point out. I have no hesitation, how- 

 ever, in calHng it a somewhat abnormally callused M. undulata Ch. 

 The lower of the two bands referred to in the original description is 

 of the faintest. The upper band is more or less interrupted after the 

 usual fashion in undulata. The abnormal thickening of the outer lip 

 has lengthened out the usual internal denticulation till it forms a series 

 of what Higgins calls sinuous plications. 



M. callosa' Marrat (i876)=M. carneola Petit (185 1). 



M. nana^ Marrat (pi. i., f. 13). — This is a very pretty and distinct 

 little species of which there are several examples. It has narrow but 

 well marked red lines on a shining yellowish white ground, and ought 

 really to be called quadrifasciate as there is a fourth very short linear 

 band which only shows round the columellai callus. The suture is 

 also marked by a red line, and there is a well marked red spot at 

 the top and bottom of the aperture. 



M. davisiana^ Marrat (pi. i., f ii)=M. bellii Sow. — I fail to see 

 how Marrat could describe the longitudinal lines as distant. There 

 are about 35 on the body whorl. The locality is Cape Blanco. The 

 locality of M. bellii, when described, was unknown. M. bellii has 

 priority. 



M. tyermani'* Marrat. — The type specimen is rather worn and has 

 an unusually thickened outer lip, a feature which always seems to 

 emphasize the internal denticulation. The other specimen, which 

 Marrat calls the variety, has not got the lip smooth inside but plainly 

 denticulate, and is a nice fresh normal specimen which, though 

 smaller, would have been far more suitable for the type, I am not 

 figuring this as it is well represented in Proc. Malac. Soc, vi., pi. 17, 

 fig. 3 — the figure of M. keppeli Sykes, which is the same species. It 

 has recently been dredged off Cotonou and Libreville, on the West 

 African coast, in i3|f. M. tyermani ha.s priority. 



1 Ibid., p. 137. 



2 Ibid., p. 205. 



3 Ibid., p. 205. 



4 Ibid., p. 136. 



Correction. — A correction in the nomenclature of the Lapp shells mentioned 

 in vol. 13, p. 358 of this Journal, seems to be necessary. Instead of Plattorhis 

 albtis \RY. drapartialdi Beck, and P. rossvtaessleri h.\\(txi,\\'., read for both Planojins 

 borealis Loven. I have to thank Mr. A. S. Kennardfor this identification. I 

 had previously remarked on the extreme likeness in these two sets, butvvas un- 

 able to do anything at the time I wrote the paper. — J- D. Dean. 



