TAYLOR : VARIATION OF LiMKiEA PEREGRA. 293 



Westerluiid gives the \^x. lacusiris of BroAvii as synony- 

 mous with Z. ovata var. balthica L., and also with tlie var. 

 lineata of Bean; the last determination is, however, I think, 

 quite incorrect. Leach's variety he considers to be a variety of 

 Z. lagotis. As far as could be judged from the limited facilities 

 for examination of specimens in the cases at the British 

 Museum, Z. ribeinnsis from Ca]:)e Verde Islands would 

 appear to be referable to this variety. 



The specimens figured I owe to the kindness of Rev. Dr. 

 Norman, who obtained them from Lake Windermere. 



Var. balthica L. Shell small, t^loljose, whorls very convex, spire not pro- 

 duced, mouth pyriform. 



This small form oi peregra, originally described 

 from the Baltic, is stated by Nilsson to be thin and 

 somewhat pellucid. 



It seems closely allied to, if not identical with, the var. 

 laciistris, but I do not venture to unite them in the present 

 paper. 



The only published figure I am aware of is the one given 

 by Sowerby, on pi. xv., fig. 103, of Reeve's Conchologia 

 Iconica, and with which figure the one I now give exactly 

 agrees. The outline is from a specimen found by Mr. L. E. 

 Adams, near Stafford, and kindly given me by him. 



Var. lutea Montagu. "Shell remarkably solid, having a very shorl spire 

 of from three to four whorls." — Jeffreys, Brit. 

 Conch., I., p. 105, 1802. 



Regarding this variety as having its 

 more special peculiarity in its thickened 

 shell substance, and not in the shade of 

 colouring expressed by its name, we shall place here the vars.' 

 fluminensis Clessin, pachygastra Slavik, crassa Gassies, solida 

 Pirona, and soUdula Hartmann. 



