On Two Species of Cyprsea. 207 



Leach saw larger specimens than those that he placed in his 

 cabinet. However that may be, there is no question that the 

 true /. londinensis, judging from the only examples of it that 

 are known, is a much larger species than the one that has 

 been mistaken for it on the Continent. Add to this that the 

 tergal striag are much more numerous and close-set in /. lon-> 

 dinensis than in teutonicus, and no one can doubt that the two 

 are perfectly distinct species. It is safe, moreover, to 

 prophesy that when fresh examples of /. londinensis come to 

 hand for examination further differences will be found in the 

 structure of its copulatory organs. 



The differences between the two may be tabulated as 

 follows : — 



a. Total length from about 38 to 48 mm., width 4 ; tergal 



striae very numerous, tine, and close-set, the intervening 

 spaces rarely exceeding and generally less than the dia- 

 meter of the porous area ; caudal process short, subcylin- 

 drical, blunt-pointed or obsolete (submucronate) londinensis. 



b. Total length from about 25 to 35 mm., width 2 - 5 ; tergal 



striae much less numerous and further apart, the inter- 

 vening spaces generally much exceeding the diameter of 

 the porous area; caudal process obtusely angular, not 

 even submucronate teutonicus. 



I. teutonicus occurs in Scandinavia, Denmark, Western 

 Germany, the north of France, and the south of England. 

 The British Museum has specimens from Kent, Middlesex, 

 Surrey, Hampshire, Oxford, and Warwickshire, but none 

 from South Wales, Gloucestershire, Somerset, Devon, or 

 Cornwall, although the Millipedes of these counties have been 

 fairly well worked. 



XXVI. — Descriptions of Two Species of Cyprasa, both of the 

 Subgenus Trivia, Gray. By James Cosmo Melvill, 

 M.A., F.L.S. 



For the opportunity of examining the two cowries now 

 thought worthy of description I am under much obligation to 

 Mr. Frederick L. Button, of Oakland, California, a most 

 enthusiastic cypreeologist who has devoted especial attention 

 to the Trivice. With much liberality he has from time to 

 time forwarded me series of species, inhabitants of the Western 

 American seas, including fusca, californica, and sanguinea, 

 all of Gray, all three exhibiting much variation, with several 



