206 PNEUMONOBRANCH1ATA. 



pale fulvous, very slightly and sharply striated ; 

 whorls four or five, last broad; mouth sub-trian- 

 gular; teeth four or five, two on the column 

 and two or three on the outer lip ; peristome 

 rather thickened. 



Turbo Vertigo. Mont. Test. Brit. 363. t. 12. f. 6. 



Vertigo angustior. Jeffreys, Linn. Trans, xvi. 

 361.; Alder, Mag. Zool. Bot. ii. 112. 



Inhab. rejectamenta of a small stream at Marino, 

 near Swansea. 



Mr. Jeffreys observes, besides the very different 

 contour and more contracted aperture of this shell, 

 the circumstance of the back being more sunk in 

 some specimens than in others, which peculiarity 

 denotes the growth of dentate shells, sufficiently re- 

 futes the idea of its being the young of V. pusilla. 



Mr. Alder observes, that the difference between 

 this species and V. pusilla appears to be more in the 

 number of the teeth than in the colour of the shell ; 

 and if the former is permanent, it is undoubtedly 

 the better character of the two. He further re- 

 marks, " I have some doubt about this species : I 

 examined Mr. Jeffreys' specimen, but could not satisfy 

 myself of its distinctness from V. pusilla : I take it 

 upon faith." 



After considerable inquiries and correspondence, 

 I have not been able to procure a specimen of this 

 species, to examine or figure; and thence I cannot 

 offer any opinion on the subject of its distinctness. 



Captain Brown has added to the list Pupa labiata 

 Brown, B. S. t. 41. f. 7. ; but the figures are so in- 

 distinct that I cannot determine them. 



