ODOSTOMIA. 117 



upper part of the laminarian zone, in the Channel Isles 

 and south of England; Ilfracombe, and Kilkee in the 

 west of Ireland (Alder); Cork and co. Antrim (J. G. J.); 

 Dublin Bay (B. W. Adams) ; Scarborough (Bean) ; 

 Clyde district (Norman, Bean, and Robertson) ; Skye 

 (Barlee) ; outer Hebrides (J. G. J.) ; Aberdeenshire 

 (Macgillivray) ; Dunnet Bay, Pentland Firth (Gordon); 

 Cruden in the Moray Firth, and Hillswick Bay in Unst 

 (Dawson); Lerwick (Barlee). Specimens from the last 

 two places are larger than any of those from our southern 

 coasts. 



Montagu's type, with " nivosus " in his hand-writing, 

 is still preserved in the British Museum; and his de- 

 scription confirms its identity with the present species. 

 Alder described and figured this shell as 0. cylindrica. 

 Macgillivray gave it another name (Anna) in honour of 

 one of his daughters. It reminds one of Dr. Johnston's 

 review of the Professor's " Historv of the Molluscous 

 Animals of the counties of Aberdeen, Kincardine, and 

 Banff" (Ann. & Mag. N. H. 1843), in which the fre- 

 quent mention of his children by the author is noticed 

 in a good-natured way, concluding with a fervent " God 

 bless them ! " 



3. O. trunca'tula * } Jeffreys. 



0. truncatula, Jeffr. in Ann. & Mag. N. H. 2nd ser. v. p. 109 ; F. & H. 

 p. 294, pi. xcvi. f. 8. 



Shell having a considerable resemblance to 0. nivosa in 

 shape ; but it is of a far greater size, proportionally much 

 thinner, and of a more delicate texture ; it has no spiral ridges 

 at the base, nor the peculiar single one at the toj> of each 

 whorl, although the whole surface of the present species is 

 more or less covered obscurely with remote spiral lines ; 

 the longitudinal striae are stronger and impart sometimes a 



* Slightly lopped or cut off. 



