LTTTORINA RUDIS. 659 



Var. Reevei, nov. Plate LIII, fig. 15. 



1857. Littorina littorea, Reeve, Conch. Icon., vol. x, pi. iv, fig. 18 a. 



Varietal Characters. — Oval, compressed, spiral lines delicate, impressed, body- 

 whorl much the largest, squarely angulate above ; spire narrow, short. 



Dimensions. — L. 15 mm. B. 15 mm. 



Distribution. — Recent: British seas, Atlantic shores of western Europe. 

 Fossil : Icenian Crag : Thorpe, near Norwich. 



Remarhs. — The fossil here given comes from the Crowfoot Collection (now in 

 the Norwich Museum) and was found at Thorpe. It corresponds almost exactly 

 with one of those figured by Reeve and to some extent with that figured by 

 MM. Dautzenberg and Fischer (op. cit., pi. ix, figs. 29, 30) under the subvarietal 

 name of canaliculatum, but it is not the same as the latter. It is a very beautiful 

 shell — the only one I have seen from the Crag — and seems to deserve a distinctive 

 name. It differs from the var. compressa in the square and angulated shelf of the 

 body- whorl below the suture, and in its much finer sculpture. 



Var. similis, Jeffreys. Plate LIII, fig. 20. 



1865. Littorina ruclis, var. similis, Jeffreys, Brit. Conch., vol. iii, p. 365. 

 1901. Littorina rudis, var. similis. Conch. Soc. List, Journ. of Couch., vol. x, p. 17. 

 1912. Littorina saxatilis, sub-sp. tenebrosa, var. similis, Dautzenberg et Fischer, Camp. Scient., Prince 

 de Monaco, vol. xxxvii (Mollusques), p. 194, pi. ix, figs. 16, 17. 



Varietal Characters.— Resembling var. tenebrosa in size and shape, but is more 

 distinctly ribbed (Jeffreys). 



Dimensions. — L. 10 mm. B. 6 mm. 



Distribution. — Recent: British coasts— Cornwall, S. Wales, Shetland, Aberdeen- 

 shire, estuary of the Aide, Suffolk. St. Malo. 

 Fossil : Not worked out. 



Remarks.— Jeffreys' description of this variety is given above, but so far as I 

 know it has never been figured in this country. Unless the type of a new and 

 undescribed form is easily accessible a short verbal notice of it is useless, often 

 leadino- to confusion and uncertainty. There is, however, a series of recent specimens 

 under this name from Aldeburgh, in Suffolk, in the Norwich Museum, and the 

 Rev. Dr. A. H. Cooke has kindly sent me some others, for the identification of 

 which he can vouch. One of these I am permitted to figure. I have not noticed 

 anything in the Crag which is precisely similar, but as most of the English 

 varieties of L. radix are to be found in our deposits it may turn up hereafter, and 

 I have fio-ured therefore a verified specimen of the present variety that I have 

 received from Dr. Cooke for the purpose of comparison if necessary. 



