JONES : TERRESTRIAL MOLLUSCA IN SOUTH-WESTERN EUROPE. 373 



Var. strigata. — This is the most common form at Gibraltar: 

 Var. alba. — I took this variety once at Gibraltar. 



H. semirugata (Kobelt). — This is a rare form related to Helix 

 lanuginosa, for which indeed I mistook it. I have taken it once only 

 in a very circumscribed locality near Algerciras. 



Cochlicella conoidea (Drap.). — This species I obtained in two 

 localities only, namely Gibraltar and Cagliari. At Gibraltar, where I 

 believe it has not previously been noted, it is confined to a hedge of 

 Aloes which fringes the road running past the North Guard House, 

 at the southern border of the neutral ground. 



Var. calaritana (Paulucci). — The Cagliari specimens were of 

 this variety. 



C. ventricosa (Drap.). — Only found at Algerciras, where it is 

 extremely abundant in the autumn and in wet weather. In the 

 summer not a single specimen is to be seen anywhere, and even in 

 winter if the weather be dry it is very hard to obtain it. Two forms 

 occur, one with black bands, one to each whorl of the shell, and a 

 bandless form. 



Leucochroa rimosa (Paulucci). — Three specimens only from 

 the Roman Amphitheatre at Cagliari. 



Ferussacia folliculus (Gronov.). — This species is extremely 

 plentiful at Algerciras, and like Cochlicella ventrosa, in company with 

 which I have usually found it, it occurs almost entirely in the autumn 

 and during wet weather. Unlike the Cochlicella, however, it always 

 keeps under stone and pieces of wood, and does not climb up the 

 stems of plants and grasses. Numerous young are to be found at the 

 beginning of December. I have only taken this species sparingly 

 at Gibraltar. 



Var. viridans. — "Shell greenish white." I have ventured to 

 apply this name to a variety I discovered at Algerciras. 



Rumina decollata (L.). — I took this species alive at Gibraltar 

 and also noted many dead shells at Algerciras, Cagliari and Cintra, 

 near Lisbon. Common as this species is, it is one of the most 

 difficult to obtain alive. At Gibraltar and Algerciras the dead shells 

 litter the ground in thousands, and yet once only for a period of a few 

 days were the animals to be taken alive in any quantity. The period 

 referred to lasted for about ten days in the beginning of April, when 

 this species was laying its eggs. I could, during that time, find any 

 quantity of specimens on the upper parts of the Rock, especially 

 above the Moorish Tower and towards Willis's. All those I obtained 

 had their shells deeply discoloured by the red earth in which they 

 had recently been buried, and in which, indeed, many were still 



