266 CONCLUSION. 



PLATE LXVIII. 



27- Fangs of the same, enlarged. 



28. Hydrachna placida. 



29. The same, enlarged. 



PLATE LXIX. 



FIG. 1. Hydrachna ferox. 



2. The same, enlarged. 



3. Hydrachna spinifer. 



4. The same, enlarged. 



5. Another specimen. 



6. Hydrachna maculata. 



7. The same, enlarged. 



8. Hydrachna sparsa. 



9. The same, enlarged. 



10. Hydrachna varia, enlarged. 



1 1 . Hydrachna crassipes. 



12. The same, enlarged. 



13. Hydrachna albator, small. 



14. The same enlarged, back. 



15. The same, enlarged, belly. 



16. Hydrachna albator, female. 



17. The same, enlarged. 



Now, let us pause awhile to indulge a brief retrospect of the pre- 

 ceding observations. We have accomplished a general survey of a large 

 proportion of the animated universe, for none other was in view. Our 

 progress has been slow and desultory ; no rigid injunction prescribed the 

 reverse of either, nor was expedition or regularity enjoined. Thus we 

 have not ventured to take a general nor a specific view of what may have 

 been the leading incidents of that stupendous event, the Creation. 

 But the enlarged and magnanimous mind cannot fail to discover that a 

 boundless blank, chilling and cheerless, must have overspread the Uni- 

 verse, for which the Divine Power has substituted an host of families of 



