TAYLOR: ON COCHLICOPA TRIDENS. 22 1 



aperture is furnished with folds or teeth of which there are usually 

 three;" the fig. on pi. ix., though rough, represents the type shell 

 as understood on the continent and in this note. 



I would propose if accordant in other respects with the usual 

 diagnosis that the specimens conforming to the following descrip- 

 ion of the armature of the aperture be considered as the type: — 



Aperture obliquely pyriform, a very strong fold on the penulti- 

 mate wdiorl, its crest sometimes notched, a small denticle close to 

 the fold and nearer the outer lip, a sinuous lamella on the columella 

 notched at the termination close to the margin, and two denticles 

 on the outer lip, one marginal and central, the inferior more 

 remote from the margin and nearer the columella. 



In England this form is not very common, and I know of very 

 few localities where it may be found: Ilkley, Yorkshire; Dorridge, 

 Warwickshire, &c. 



Var. iMouletiana Dupuy. Shell rather larger and thinner, a 

 single denticle only on outer lip, peristome thinner. 



This is our common English form. Jeffreys and Reeve are 

 dubious as to its occurrence in Scotland. Mr. Alfred Brown of 

 Glasgow however informs me that he has found it at the Bridge of 

 Allan, Perthshire, thus establishing it as a Scotch species. 



Var. Alzenensis St. Simon. Outer lip bearing two deeply- 

 seated denticles in addition to those described in the typical form. 

 Found at Dorridge, &c., Warwickshire. 



Monstr. sinistrorsa. Shell reversed. 



A specimen of this form has been found by Mr. J. Emmet 

 of Boston Spa and is in that gentleman's collection. 



Var. crystal I ina Dupuj^ Shell greenish- white. 

 Generally found associated with specimens of the ordinary 

 color, but sparingly. 



Leeds, June loth, iSyg. 



