90 



It will perhaps be observed that De Lessert has published 

 figures representing the above Lamarckian species ; we must, 

 however, note that the one he calls ambigua, represents 

 Lamarck's interrupta ; that the figures intended to represent 

 decussata and lineolafa, do not resemble any species we have 

 ever seen, and that the figure of C. multilabris Lam. represents 

 only an accidental deformity* 



AV^e have particularly to acknowledge our obligations to the 

 llev. F. J. Stainforth, for the use of his very complete collec- 

 tion of species; to M. Alcide D'Orbigny, for the species 

 collected by him in Cuba; and to Hugh Cuming, Esq., 

 for the numerous species collected by himself among the 

 Philippine Islands, as well as for much information relative to 

 localities which he has kindly communicated to us. 



AVe have arranged the species under two divisions, the first 

 consisting of those which have the peritreme simple and not 

 reflected, or very slightly so ; and the second consisting of 

 those in which it is more or less reflected, of the former there 

 are 56 species, and of the latter 119 species. A.t the same 

 time we have endeavoured, as far as we could judge of their 

 affinities, to bring together those species which are most nearly 

 related, so that the whole will be found to form natural groups ; 

 for example, the 168th to the l75th species, consisting of C. 

 antillarum, C. tortum. C. ventricosum, C. auriculatum, C. 

 tortuosura, C. altum, C. pupiniforme, and C. minus are 

 evidently closely allied species ; thus again the 158th to 162nd 

 which are all European species bearing a general resemblance 

 to each other, are all brought together : the same may be said 

 of C. Involvulus and of C. laeve and their cognate species, as 

 well as of nearly all the remainder ; if we have not always 

 fully succeeded in our attempt, it appears to have been because 

 the affinities have not been very obvious. 



*It seems needful to remind our general readers that Cyclostoma is neuter, 

 consequently the specific names should terminate in um or e, except when they are 

 substantives, such as Orbella, goniostoma, muUilabrum, Ortyx, Cincinnus, &c. 



