LUMBRICUS. 141 



PLATE XVII. 



FIG. 13. Lumbricus Mrsutus. 



14. Anterior part, enlarged. 



15. Middle, enlarged. 



1 6. Posterior part, enlarged. 



Many other Vermes and Lumbrici of Scotland merit examination, 

 description, and representation. The genera comprehend numerous 

 species, which have been hitherto overlooked, in as far as I know, by all 

 observers. Some of those preceding require further investigation than 

 circumstances would permit me to bestow on them. Their introduction 

 here may be considered temporary or provisional, rather than assigning 

 to the whole a positive position which may be altered. The two genera 

 will certainly admit several subdivisions, which doubtless must be in- 

 fluenced by the appearance presented by the interanea of the more 

 transparent species. 



There are various animals participating of the nature of the Lum- 

 bricus, which may be considered intermediate stages to the genera. But 

 I shall meantime reserve them for a miscellaneous chapter in another 

 place. 



