SUMMARY OF THE TABLES. 



The following table shows the relative proportions of the different 

 groups included in the fauna and enumerated in the tables preceding : 



It may be added that, with but few exceptions, the enumerated extra- 

 limital forms are likely, with further exploration, to be found in our 

 region. 



If all the Nudibranchiata, Heteropoda, and Cephalopoda were enu- 

 merated the total would be at least eighteen hundred forms. 



It is probable that some of the species enumerated in the tables will 

 hereafter prove to be synonymous with other enumerated species. But 

 there is a reasonable prospect of the discovery of deep-water species, 

 new to science or to the region, and of Antilleau species which extend 

 to the region of the Florida Keys which are not here enumerated, so 

 that the loss from the above-mentioned cause will probably be more 

 than made up numerically. This being the first attempt to enumerate 

 the Molluscau fauna of the whole region, generalizations may well be 

 deferred. 



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