296 JOURNVL OF CONCHOLOGY, VOL. 16, NO. 9, JUNE, I922. 



2. Balea perversa and Clausilia bidentata. 



Mr. Welch (I.e., p. 312) details various Irish occurrences of B. 

 perversa and CI. bidentata separately and in association, and con- 

 cludes that " it is not so much the geological formation as presence 

 of trees or damp shelter of some kind that regulates the abundance 

 of these two species and their association together. Trees and such 

 situations are, on the whole, more plentiful in limestone areas in 

 Ireland and Balea is for that reason, being an arboreal species, more 

 plentiful in such situations, and Clausilia, being a common species 

 in damp, and often in dry, situations all over Ireland is of necessity 

 associated with the other." 



So far as the writer's experience goes in N.E. Staffs. Balea is only 

 to be found in isolated colonies on moss-grown walls — never on trees; 

 indeed the only mollusca the writer has ever seen on trees in this 

 district have been slugs! The presence of trees is by no means 

 essential to the occurrence of the species. CI bidentata has been 

 found under stones in a garden and in quarries ; under the upper 

 stones of walls ; amongst grass roots on rock faces in limestone areas ; 

 under fallen wood, etc. Both species are more common on the 

 limestone than away from it; the writer knows four colonies of ^. 

 perversa in limestone areas and only a single colony elsewhere; in 

 the case of CI. bidentata, five and two stations respectively. On the 

 limestone the only species associated with Balea are the ubiquitous 

 P. rnpestris (Drap.) and H. hispida (L.) ; on the grit the accompany- 

 ing species are more numerous — H. arbustorum (L.), H. hispida (L.), 

 E. obscura (Miiller), P. rotundata (Miiller), and CI. laminata [Mont.). 

 Thus it has hitherto not occurred with CI. bidentata ; species found 

 in association with the latter include, apart from slugs : — V. pellucida 

 (Miiller), V. crystallina (Miiller), V. nitidula (Drap.), E. fulvus 

 (Miiller), P. rupestris (Drap.), P. rotundata (Miiller), II. caperata 

 (Mont.), H. hispida (L.), H. lapicida (L.), H. arbustorum (L.), H. 

 nemoralis L., H. hortensis (Miiller), E. obscura (Miiller), C. lubrica 

 (Miiller), y. cylindracea (DaC), CI. lamifiata (Mont.), and C. mini- 

 mum Miiller. 



^-m^^ 



Limax flavus var. virescens F6r. at Reigate. — Last December (1921) a 

 single specimen of the var. virescens Fer. turned up among the colony of var. 

 tigrina Pini at Reigate.— Lionel E. Adams. 



Hyalinia lucida in the Isle of Wight. — On September 28th, 1921, I found 

 three dead specimens — apparently killed by the drought — near Ventnor. A single 

 white Ena obscura turned up at Brading next day. It may be also of interest to 

 mention that whilst re-arranging a set of Hy. fiitidula from Haselbeech, North- 

 hamptonshire, I found one shell had its umbilicus turned inside out like a small 

 boil, but it was punctured. — W. A. Shaw. 



