810 Mr. J. G. Jeffreys on some British Shells. 



Pteropoda ? 

 Orbis foliaceus, Philippi, vol. ii. p. 147. tab. 24. f. 26. Several 

 specimens of this singular shell occurred to us in about fifty 

 fathoms water off Skye. I doubt this species being the same as 

 that of Philippi, because in perfect specimens the last whorl ex- 

 ceeds in size all the others so as to form an obtuse keel. One 

 specimen is remarkable for its having two apertures occasioned 

 by a malformation of the firsts and the animal having subse- 

 quently formed another to replace it. This monstrosity is occa- 

 sionally found in the shells of Gasteropods. 



Gasteropoda. 



Bulla pruinosa, Zool. Journ. vol. iii. p. 341. One specimen of 

 this shell, which had not been, as far as I am aware, rediscovered 

 by any collector since the publication of the species by Mr. Clark 

 in 1827 as an Exmouth shell, occurred from Loch Fyne. Mr. 

 iBarlee observed a specimen in the Rev. Dr. Fleming's collection, 

 and procured another specimen last year from Branscomb, Mr. 

 Clark's dredger at Exmouth. 



Bulla acuminata, Phil. vol. i. p. 122. t. 7. f. 18. A single 

 specimen (although broken) from Loch Fyne. Mr. Alder in- 

 formed me that he had also found one specimen on the west coast 

 of Scotland. 



Bulla truncatuhj Phil. vol. i. p. 122. t. 7. f. 21. Volvaria sub- 

 cylindricaj Brown, p. 3. pi. 19. f. 19, 20. Several specimens of 

 this very distinct shell occurred in from twenty to fifty fathoms 

 from the coast of Skye. 



Bulla mammillata, Phil. vol. i. p. 122. t. 7. f. 20. Skye. 

 This species had previously been found by myself and others at 

 Exmouth and on other parts of the south coast. 



Rissoa Barleei. Shell subcylindric, smooth, solid, of a yel- 

 lowish horn-colour. Volutions six, gradually increasing in size, 

 and more or less decorticated at the top ; suture slight. Apex ob- 

 tuse. Aperture oval, contracted and surrounded by a complete 

 peristome and having the outer lip inflected towards the pillar. 

 Umbilicus none. Length 1^ line ; breadth f of a line. 



Loch Carron and Skye in twenty to fifty fathoms. 



This species has very much the appearance of Rissoa [Palu- 

 dina) Ulv(2, but differs from it in its subcylindi'ical form, its 

 rather more solid texture, in not having the last volution an- 

 gulated, and above all in its more contracted aperture and the 

 peculiar inflexion of the outer lip. Its habitat is also very dif- 

 ferent. I had not an opportunity of examining the animal. 



Rissoa clathrata, Phil. vol. ii. p. 223. t. 28. f. 20?. Cyclo- 

 strema zetlandicum, Flem. Brit. An. p. 312. 



In fifty fathoms off Skye. 



