180 PNEUMONOBRANCHIATA. 



with a shorter spire, and a more oblique, oblong, 

 larger mouth. It is very doubtful if this is more than 

 a variety of that variable species. 



Mr. Alder observes, " It may require further inves- 

 tigation to decide whether or not this be really dis- 

 tinct from S.putris. I have found them plentiful within 

 100 yards of each other, each retaining its charac- 

 teristic marks in the colour of the animal and shape 

 of the shell, and unmixed with the other sorts. Some 

 foreign species of this difficult genus, quite as nearly 

 allied as this to S. putris, are nevertheless considered 

 to be distinct." 



58. 3. SUCCINEA oblonga. Oblong Amber Snail, 

 (t. f. 139.) Shell oval, rather ventricose, slightly 

 striate, reddish horn-colour; whorls three or 

 four, produced ; suture distinct ; aperture oval. 

 Succinea oblonga. Drap. p. 59. t. 3. f. 24, 25. ; 

 Jeffreys, Linn. Trans, xvi. 325. 505. ; Alder., 

 Mag. Zool. Bot. ii. 106. 



Inhab. edge of ditches, Britonferry, near Swan- 

 sea (Jeffreys}^ Bathgate, near Glasgow (Kenyan}. 

 Animal black-grey ; tentacles nearly conical. 

 Shell small, like Limnceus fossarius in shape ; the 

 spire conical, produced, as long as the mouth. 



This is probably the small variety indicated by 

 Dr. Johnston, as about 3-10ths of an inch long; it 

 is common in Berwickshire. " It seems to be," he 

 adds, " a perfect shell, and in the places where it 

 abounds, the larger shell is not found." (Berwick 

 N. Hist. Club, p. 154.) 



