Vol.. I. NOVKMBER, 1892. No. 8. 



THE IRISH IvAND AND FRESHWATER MOEI.USCA. 



BY R. F. SCHARFF, PH.D., B.SC. 



[Contimied from page 109,) 



GASTROPODA. 

 P U L M N A T A . 



Genus— ALEXIA. 



The introduction of this, and the iiext genus among the Land and 

 Freshwater Mollusca, may seem to many conchologists somewhat out of 

 place ; but it must be remembered that these genera contain no truly 

 marine forms. All the species of Alexia and Alelamiyus inhabit brackish 

 water, and they are very closely allied to Carychium. 



Alexia denticulata, Mont. 



— II. _ — V. — — — IX. ^ — XII. 



Although probably more widely spread round the coast, it has only as 

 yet been recorded from a few localities. 

 Foreign Distribution. — England, Wales, and west coast of France, 



Genus— MELAMPUS. 



Melampus bidentatus, MonT. 

 — — — — V. — — — — — XL — 



According to Thompson (15) this species is "general along the coast of 

 Ireland," but he mentions no particular localities. It occurs at Port- 

 marnock (5), and Sheephaven (Hart). 



Foreign Distribution. — Coast of Great Britain, north and west coast 

 of France, Mediterranean, Adriatic, and coast of Madeira. 



Genus— OTINA. 



To judge merely from habitat, this genus might reasonably be included 

 among the marine IVIoUusca, as it is by many conchologists, but the 

 family Otinidcc to which it belongs includes several terrestrial and fresh- 

 water forms, the genus Otina being the only one which has adapted 

 itself to salt-water, as it lives between tide-marks. 



