CANARIAN GROUP. 307 



garded as extinct until the contrary has been shewn by actual 

 observation. The 13 to which I allude are as follows : 



Helix digna, Mouss. . . . Gomera 



Moussoniana, Woll. (Adonis, Mouss.). Gromera 



efferata, Mouss. .> . . . Gomera 



gravida, Mouss. ..,.*.. '.: V ..... . Fuerteventura 



desculpta, Mouss. .... Fuerteventura 



semitecta, Mouss. . ,--:> - Gomera 



merita, Mouss. . . . . Gomera 



indiflferens, Mouss. . . . Hierro 



rnultigranosa, Mouss. . . . Gomera 



morata, Mouss. .... Fuerteventura 



multipunctata, Mouss. . . . Fuerteventura 



Bulimus indifTerens, Mouss. . . . Grand Canary 



Pupa macrogyra, Mouss. . ^ * . Gomera. 



In addition however to these 13 species which must be 

 looked upon practically (at any rate for the present) as having 

 passed away, it will be seen by a reference to the local cata- 

 logue given at the close of this Section that about 30 others, 

 out of the 189, have been collected also in a state which may 

 be regarded as more or less ' subfossilized ;' but, as mentioned 

 at p. 63 (when commenting on the extinct fauna of the Ma- 

 deiras), I place so little reliance upon these so-called ' subfossil' 

 individuals, many of which have often appeared to me to be 

 scarcely more than bleached and decorticated ones, that I shall 

 not attempt to draw any deductions concerning them. Indeed 

 until the several islands have been much more perfectly investi- 

 gated, I cannot but think that this would be both premature 

 and useless ; though as the nature of the beds (whether calca- 

 reous or muddy) in which the specimens are usually to be 

 procured are exactly analogous to those of the Madeiran archi- 

 pelago, we may be pretty certain that whatever conclusions can 

 be safely arrived at from Madeiran data (which have been 

 altogether more accurately accumulated) will apply equally, so 

 far as the geological aspects of the question are concerned, to 

 the other islands. I have therefore considered it sufficient, in 

 the present remarks, to call attention to the few forms which 

 have not yet been brought to light except subfossilized. 



Although without much signification, in the very imperfect 

 state of our present knowledge concerning the conchy liferous 

 deposits in the Canarian Group, I have nevertheless in the topo- 

 graphical list at the close of this Section prefixed an asterisk (*) 

 to those species which have been found likewise in a more or 

 less subfossil condition ; and in those instances where the species 

 have been observed only subfossilized (under which circurn- 



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