90 ; LIVERPOOL BIOLOGICAL SOCIETY. 
Clausilia nigricans, Mat. and Rack. 
Very common, and the specimens large. 
Zua lubrica, Mull. 
Only one specimen, found by Mr. Gregory; no doubt 
there are more, but so far they have escaped notice. 
PNEUMONOCHLAMYDA. 
Family: CycLOSTOMATIDA. 
Cyclostoma elegans, Mull. 
This beautiful shell was found to be fairly common on 
the Great Orme’s Head, and so far as I have read I have 
not noticed it recorded as having been found previously in 
this district. 
