Mr. Alder's Catalogue of Land and Fresh-water Shells. 31 



17. P. complanatus, Flein. 



P. marginatus, Drap. 

 H. complanata, Linn. 

 In ponds and ditches at Prestwick Car. 



Fatn. CoLiMACEA. 



Gen. AURICULA. 



18. A. minima, Drap. 



Turbo Carychium, Mont. 

 In moss, commmon. 



Gen. SUCCINEA. 



19. S. amphibia, Drap. 



Helix succinea, Mull. 



On plants in marshy places, frequent ; generally in woods. 



This includes the var. « and /3, Drap. and is distinguished from the following species by 

 the shell being rather stronger, smoother, and more shining ; broader in proportion to 

 its length ; the whorls more rounded, and in having half a whorl more. Lip entire, even 

 in young shells. 



20. S. oblonga, Bean, MSS. 



S. amphibia, var. y and t, Drap. 



Shell transparent, shining, amber-coloured, oblong, slender, rather strongly wrinkled ; 

 with three flattish whorls, the first very large and much compressed towards its junction 

 with the second ; aperture oblong-oval, contracted at the upper angle ; lip very thin and 

 membranous, so as seldom to be found entire ; length from 6 to 7 tenths of an inch, 

 breadth one half its length. 



A small variety only is found in this neighbourhood, on stones close to the edges of 

 streatns, and is most plentiful in the spring and early part of summer. It is not nmch 

 more than half the size, more rugged, less transparent, and rather less compressed at the 

 junction of the whorls, which leads to the supposition that it may turn out to be a dis- 

 tinct species. At present, however, I have followed the opinion of Mr. Bean in making 

 it only a variety, and have also adopted the specific name communicated to me by that 

 gentleman, for which he informs me he has the high authority of M. de Ferussac. This 

 species is not, however, the S. oblonga of Draparnaud. 



Gen. ACHATINA. 



21. A. acicula, Lam. 



Buccinum terrestre, Mont. 

 A single shell of this species was found on the sands at Tynemouth. From its delicate 

 and fragile texture it could scarcely have been washed from a greater distancethan the 



