60 COLLINGE : REVIEW OF THE ARIONID^ OF THE BRITISH ISLES. 



prominent lateral bands and stripes, continued around the mantle. 

 Gain (17) records that young light-coloured varieties have darker 

 stripes at the sides and round the mantle, similar to those of 

 A. subfuscus. When about half-grown the difference in colour 

 becomes less prominent, owing to the rest of the body becoming 

 darker. Simroth (39) looks upon the banding as an ancestral 

 character (" Stambinde"). I know of no species of Arion in which 

 the bands are absent in the young form. Scharff (35, p. 515) 

 distinguishes between bands and stripes, " the former dark, the other 

 light in colour." I think it is preferable to retain the term band for 

 the largest and most prominent line — generally the upper one — and 

 the term stripe for the finer lines nearer the foot-fringe. 



Variation. — It is quite out of the question to here make any 

 attempt to review the whole of the minor varieties. A plan I have 

 previously adopted (10) has been here adhered to, viz., that of group- 

 ing the less important under the well-marked and characteristic 

 variations. 

 a — fasciatus, Ckll. Possibly this form will have to be re-named, as 



Seibert has described a v. fasciatus of A. ritfus (probably it is 



synonymous). 

 B — elineolatus, Ckll. Mr. Cockerell thinks this is the var. 4, of Leach, 



from Cornwall. (See Synops. Moll. Gt. B., p. 67). 

 C — swammerdamii, Kal., = marginatus, Moq. An interesting form. 



The foot-fringe varies from yellow to an orange-red. 

 D — razoumouskii, Kal. Such forms as nigrescens, Moq., cinerescens, 



Ckll., and plumbeus, Roebuck, are synonymous. 

 E — albus, Fer. Varies from white to cream colour. 

 F — ruber, Moq.-Tand. All the red and brown forms that I have 



examined — and I must have seen some hundreds — should, 



I think, be referred to this variety. The following may, therefore, 



be looked upon as synonymous. 



v. drapamaudii, Kal. = drapamaudii, Moq., v. lamarkii and 



fohnstonii, Kal., v. brunneus, Roebuck. 

 G — hibernus, Mab. = violescens, Cllge., M.S. Not an uncommon form 



in this country. 

 h — bicolor, Moq. This handsome variety has been figured lately by 



Scharff (35). I have noticed very little variation in the 



specimens I have examined. 

 1 — pallescens, Moq. Such forms as brunneopa/lesce?is, luteopal/escens, 



and fuscoliitescens are minor forms of this variety. The latter 



name has been previously used for a similar variety by Pavia, 



but Mr. Cockerell informs me that the term was merely 



descriptive and not intended as a name, hence he re-described 



