loS JOURNAL OF CONCHOLOGY, VOL. l6, NO. 4, AUGUST, I92O. 



of var. undulata overlaid on the typical formula. 1(23)45. This form 

 though less distinctly marked was the predominant feature of the 

 collection. The var. clathrata was represented by a beautiful darkly 

 pigmented shell. A curiously injured shell was evidently broken and 

 repaired after maturity, as is shown by the repaired portions being 

 quite destitute of epidermis and markings, due to the cessation of the 

 secretory activity of the collar of the mantle. Bouchard-Chantereaux 

 notes H. aspersa as very common and cites two monstrosities, scalaris 

 and semiscalaris. 



Helix nemoralis L. — Fairly well distributed, the specimens being 

 gathered from three different, though probably neighbouring, localities, 

 viz., Zutkerque, Polincove and Ostove, though the shells in the collec- 

 tion are mostly from Polincove, all in the arrondissement of St Omer. 

 The var. majoi' Pascal is represented by a fine shell, whose rich yellow 

 ground colour and band formula 1:345 places it under the var. 

 adansonia Moq. The var. libellula Risso is the most abundant colour 

 variation in the collection, two-thirds belonging to the rich yellow var. 

 flava Picard, and the remaining third to the pale yellow form, var. 

 lutescens Picard. The sub-var. aurantia-libellida is represented by 

 three specimens ; they are of a unicolorous yellow with orange apical 

 whorls. The var. rubella Picard is represented by eighteen specimens, 

 which is a larger proportion than is usually found in this country, 

 although only four are strictly typical of the variety. Several of the 

 shells are of a rich deep red colour and are the var. rubra Baudon, 

 others of a delicate rosy-red are referable to the sub-var. rosea Baudon. 

 Of the sub-var. carnea Baudon. which has a flesh-coloured ground, 

 only half-a-dozen specimens are included, but some of these would 

 probably be more precisely indicated by Prof. Boycott's name var. 

 inista, I'he var. castanea Picard is present in the form of the sub-var. 

 fulvo-tinda of Ckll., of a very pale fulvous or pinkish-yellow colour, 

 which also shows a very pale semi-transparent peripheral band and by 

 this zonulation belongs the mutation duchampia Ldcard. Of the 

 var. oHvacea Risso only a single shell is present, clearly displaying the 

 orange yellow sub-marginal band which externally borders the aperture 

 and contrasts so strikingly with the deep, dark colouring of the rest' 

 of the shell. The \a.v. fascialba Picard shows an unusualiy laf^e 

 proportion. It is an ancient or palaeogenic form, which has preserved- 

 the calcified white peripheral zone, whose position indicates the divi- 

 sion between the upper and lower group of bands of a former band 

 arrangement, approximating to that now possessed by Campylcea. It 

 is in this species an atavic development and therefore more frequently 

 present towards the limits of the natural range of the species. A 

 very handsome but scarcely mature specimen of nmt. ^(?«^,z'rt/^/(i; Moq. 

 (formula 00^45) which Mr, Cribb was rearing to maturity, is pfe- 



