338 Mr. J. G. Jeflfreys on the recent species of Odostomia 



Var. b. spira elatiore. 

 Southampton ; Oxwich Bay near Swansea. 

 Rare. 



6. Odostomia dubia. 

 Testa ovalis, tenuis, nitida, pellucida, glabra, alba ; anfractus 5, 

 convexi, ultimo § spirse subsequante ; apex obtusus ; sutura di- 

 stincta ; apertura ovalis, pauUulum subtus effusa ; peristoma pos- 

 tice reflexum ; denticulus parvus sed conspicuus ; umbilicus di- 

 stinctus. Long. -^-^, lat. -^ unc. 



Differs from nitida in the spire being more produced, the vo- 

 lutions not being so gibbous, and in the aperture being more oval 

 and the tooth smaller. From albella it differs in its smaller size, 

 its less cylindrical form, the proportionate size of the last whorl 

 (which is only half the size of the spire in that species), as well 

 as its having a distinct umbilicus, and the tooth being much 

 stronger and more conspicuous; from pallida in the volutions 

 being more convex, the presence of an umbilicus, and the tooth 

 being more conspicuous. From Rissoides it differs in its smaller 

 size, and in not being turriculate as in that species. 



Southampton. Exmouth (Mr. Clark). Torquay (Dr. Battersby). 

 West coast of Scotland (Mr. Barlee). Rare. 



Var. a. major et plus ovalis. 



Lerwick. West coast of Scotland (Mr. Barlee). 



7. Odostomia albella. 



Turhonilla albella, Lov. 19. 



Odostomia albella, Aid. Cat. 51. 



Tynemouth and Cullercoats (Alder). Oban and other parts of the 

 west coast of Scotland ; Roundstone, co. Galway ; Guernsey (Mr. 

 Barlee). 



Var. a. spira breviore. 



Torquay (Dr. Battersby). 



A local species. 



8. Odostomia acuta. 



Testa oblonga, conica, solidula, nitida, glabra, rufescenti-alba ; 

 anfractus 8, convexi, teretes, ultimo dimidiam testae subsequante 

 et pauUulum carinato ; apex acutus ; sutura distincta ; apertura ro- 

 tundato-ovalis, subtus effusa ; peristoma non reflexum ; denticulus 

 validulus, acutus ; umbilicus conspicuus. Long. ^, lat. -^^ unc. 



Exmouth (Mr. Clark). Loch Fyne and west coast of Scotland ; 

 Arran Isle, co. Galway (Mr. Barlee). Torbay (Dr. Battersby). 

 Local. 



Odostomia unidentata var. Alder Cat. 51 ? 



This elegant species differs from plicata in the spire being much 



