No. 89.] 



21 



my interpretation of a fact; and for a similar reason I have freely 

 employed the mark of uncertainty [?], which is to be understood 

 as always referring to what follows, and not the word going before. 

 Thus Bulla Inehulosa (Gould), signifies that it is uncertain whether 

 the Bulla belongs to Gould's species;^ while lAlaha conica signifies 

 that the generic position of the species conica is doubtful. 



As the proposed object was to exhibit all that was known of a 

 local fauna, many species are described from more or less imperfect 

 materials, which would not have been noticed if from a mixed 

 collection. The same course is usually followed in describing fossils 

 of any given formation, where objects are carefully noted that a 

 mere collector of " good shells" would cast aside as worthless. There 

 appears no reason for denying all knowledge of existing forms, 

 merely because that knowledge is not as full as may be desired. 



Warrington : Jpril 22, 1857. 



PHILIP P. CARPENTER. 



