2IO ROEBUCK : ON DENBIGHSHIRE MOLLUSCA. 



Bodscallan, Rhos Fynach, and Tal-y-Cafn ; and in 1877 at 

 Tan r allt. 



Z. glaber. Common in many places ; Gloddaeth woods, 

 Eglwys Rhos, foot of Little Omie's Head, Llangwystenin, 

 Llandrillo, Tal-y-Cafn, and Llanrwst. 



Z. nitidulus. A few specimens found at Bodscallan, Glod- 

 daeth woods, and Llandrillo, and plenty at the foot of the 

 cliffs of the Little Orme's Head. 



Z. crystallinus. A few in the woods at Bodscallan. 



Helix aspersa. Abundant everywhere in the Llandudno 

 peninsula, also at Llandrillo, Llangwystenin, and Rhos 

 Fynach, and about Tal-y-Cafn. 



H. aspersa var. minor. Some of the specimens from Eglwys 

 Rhos are of this form. 



H. nemoralis. Abundant by roadsides among thistles and 

 on posts in the flat lands between Llandudno and Glod- 

 daeth, also in various other places. I give a table showing 

 the relative numbers of the individuals appertaining to the 

 different variations of colour and banding. To understand 

 the column headed ' Band-formula ' it is only necessary to 

 bear in mind that the normal number of bands is five, and 

 that each is constant in its position and may be designated 

 by a number when present, and by a cypher when absent ; 

 also that when two bands are present and fused together, 

 that their numbers are placed between parentheses ( ) ; 

 and that when any band is nearly obsolete or reduced to a 

 fine line it is denoted by a small figure instead of a large 

 one. It will be noticed on reference to the table that two 

 of my specimens are seven-banded and six-banded, result- 

 ing from the presence of additional bands supplementary 

 to (or split off from) the usual third band. 



J.C, iv., July, 1S84 



