JONES : TERRESTRIAL MOLLUSCA IN SOUTH-WESTERN EUROPE. 37 1 



H.M.S. "Serpent" is erected at Arosa Bay. These last were, like 

 all the Arosa Bay shells, extremely thin and fragile. Var. ornaia occurs 

 with the type. 



H. pisana (Muller) — This is a very common species all over such 

 parts of south-western Europe as I have visited. I found it plentifully 

 at Gibraltar, Linea, Algerciras, and Cintra near Lisbon, and in rather 

 less quantity at Arosa Bay in the north of Spain, and at Cagliari in 

 Sardinia. The Gibraltar specimens are the largest and strongest, and 

 those from Algerciras the most beautifully marked, whilst the Arosa 

 Bay and Cagliari examples are rather small and inclined to be feature- 

 less as regards colouring. The varieties albicans and lineolata are 

 those most frequently met with. 



H. barbula Charp.— This species was only met with at Arosa Bay 

 where it was not uncommon. The shells were fairly large but 

 extremely brittle, so much so that they required most careful handling 

 in cleaning. 



H. nemoralis (L.). — I only met with this species about Arosa Bay 

 and Cintra in Portugal. The Arosa Bay specimens were all of large 

 size and rather fragile, whilst iri colouring they presented the most 

 remarkable heterogeneity I have ever known this species to exhibit. 

 No two specimens are quite alike, and hardly one of them exactly 

 conforms to the requirements of any varietal name. Some are almost 

 the colour of var. castanea and others almost that of var. rubella but 

 they are never exactly these. In the Arosa Bay specimens those 

 which approach these two varieties most nearly have a curious shade 

 of green in the composition of their colouring, and all specimens 

 present a remarkable mottled appearance which is due I believe to 

 the texture of the shell itself. 



As regards band formulas the usual 12345 was undoubtedly the 

 commonest at Arosa Bay, and at Cintra was the only one almost, 

 though 00000 and 00300 did occur very sparingly at the latter place. 

 At Arosa Bay the formula which occurred next most commonly to 

 the normal was the rare 00345, which considering its unusual occur- 

 rence elsewhere is of note. The Cintra specimens presented in 

 contra-distinction to those from Arosa Bay well-marked examples of 

 the varieties rubella and libellula. 



H. aspersa (Muller). — Wherever I went I found this beautiful 

 mollusc, and always in considerable numbers. The most remarkable 

 specimens that I saw were at Arosa Bay, the largest at Gibraltar, and 

 the most beautifully marked at Cintra. The shells of the Arosa Bay 

 specimens though large and richly coloured were by far the thinnest I 

 have ever seen, reminding one strangely in their extreme fragility of 

 those of Helix fusca. So thin were these tests, that they appeared 



