of Land and Fresh Water Shells. 339 



On looking over theBARON de Ferussac's* splendid collection.in the summer of last year, 

 I found that he had adopted the above name of gracilis which I had proposed for this spe- 

 cies some time before. He expressed to me his conviction that it was a good species. It 

 is only fair, however, to say that many good naturalists still consider it to be a var. of S. 

 amphibia, Drap The true S. oblonga, Drap. has been added to our Fauna by Mr. Jeffreys. 



ACHATINA. 



A. Acicula. (vol. i. p. 31.) 



This species was previously admitted into the Catalogue on the authority of a single speci- 

 men found in sand at Tynemouth. I am happy to be able to add in further proof of its inhabit- 

 ing this neighbourhood that Mr. Benj. Johnson, jun. has found in it the rejectments of 

 the river at Bywell. I have also obtained two or three additional specimens from Tynemouth 

 sand, and one out of sand brought from the Fern Islands by Mr. A. Hancock. 



CLAUSILIA. 



C. dubia, Drap. 



C. rugosa, large var. (vol. i. p. 32.) 



Shell dark brown, rather ventricose, with strong raised striae rendered somewhat granular 

 hy a few spiral ridges on the lower whorls; whorls 10 to 12, a little rounded ; aperture 

 with two teeth on the pillar, the lower one forked internally ; peristome white, detached, 

 and reflected. Length, 5-8ths of an inch ; breadth, rather above l-8th. 



On rocks at West Boldon and Castle Eden. 



This species is undoubtedly the C. dubia, of continental authors. It may be distinguished 

 from C. rugosa by its greater size and ventricosity. 



PUPA. 



P. umbilicata. (vol. i. p. 33.) 



On breaking the shells of several specimens collected at Castle Eden, a few years ago, I 

 found them to contain young with the first whorl of the shell formed. This would lead 

 to the conclusiou that the animal is viviparous, which is contrary to the general opinion. 

 I have not since been able to find any in a similar state. 



VERTIGO, Muller. 



The genus Vertigo being now pretty generally adopted for those Pupidai in which the 

 lower pair of tentacula are wanting, or so indistinct as not to be readily observed (for the 

 smallness of the individuals makes it difficult to determine the fact) ; it is necessary to 

 state that the following species of my Catalogue are referable to this genus : — P- edentula' 

 P. sexdentata, P. pygmcea, and P. Vertigo (V.pusilla, Mull.) 



For P. sexdentata (vol. i. p. 34) read V. substriata. 

 Atea substriata, Jeff, in Linn. Trans. 

 Vertigo similis, Fir. Tab. des Moll. 



The name of sexdenta has been applied to several distinct species and ought to be dis- 

 carded, I therefore adopt with pleasure that under which it has been described by Mr. 



• The premature death of this eminent naturalist is a great loss to science. 



