252 Marshall: additions to 'british conchology.' 



R. pulcherrima var. pellucida Marsh. Clear white, with 

 no traces of coloured markings. Found in sea-weeds at 

 Guernsey and Herm, with the type. 



R. cingillus var. graphicus Turton. Straw colour, with 

 faint bands of a darker shade. I think this may fairly be 

 restored to the British List ; it is a well-marked variety. 

 It is this form which is so abundant at Weymouth and 

 Lulworth, and not the white one as stated by Jeffreys. 

 Turton gave Weymouth as the locality for his var. graphicus. 



Hydrobia ulvas var. minor Marsh. Much smaller, not 

 exceeding a line in length, and narrower throughout. 

 Found underneath stones, between tide-marks. This 

 variety is exclusively marine, the type living on mud-flats; 

 it also has its white representative. It is very closely allied 

 (much more so than the type) to the Turbo miiiuta of 

 Totten, which inhabits the North American and Canadian 

 coasts. 



H. ulvae var. tumida Marsh. Shell forming a short cone, 

 with a spire of 4-5 convex whorls, and a necessarily deeper 

 suture, the body-whorl being abnormally large, with no 

 trace of a keel. Found at Skegness and Dornoch Frith. 

 This variety is analogous to H. ventrosa var. ovata, for 

 which it might at first sight be mistaken ; but the body- 

 whorl is far larger, the suture shallower, and the shell 

 thicker. 



H, ulvse var. decollata Marsh. Part of the spire decollated 

 and plugged up. From Killala Bay, Sligo, west coast of 

 Scotland, and other localities. In the first-named locality 

 live specimens are reduced to the two lower whorls only. 



Scalaria pseudoscalaris Broc. For full particulars see 

 'Journal of Conchology' for March, 1887. 



Odostomia albella var. subcyiindrica Marsh, More 

 elongated and narrower. It occurs rarely with the type in 

 Guernsey and Jersey, but at St. Mary's, Scilly, under 

 stones at low water, nearly half the specimens are of this 



J.C, vii.jOct. 1893. 



