HIEUDO. 



larity, though not sufficient to disturb the position of the animal as a 

 variety. 



A specimen fed on white-fish in preference to flesh. 



This variety is also found in the city of Edinburgh, in a ditch or 

 rivulet of a hollow, about fifty yards south of Athole Crescent, which 

 has afforded the finest specimens, figs. 17, 18 ; head of another specimen 

 enlarged, fig. 19. 



PLATE II. 



FIG. 1. Hirudo octo-oculata (vulgaris), the Eight-eyed Leech, crawling. 



2. The same, quiescent. 



3. Anterior portion, shewing the number and distribution of the eyes, 



enlarged. 



4. Section of a specimen, shewing the aspect of the surface, enlarged. 



5. Capsule. 



6. Capsule observed in the course of formation, as it appeared the day- 



after production. 



7. Capsule produced on August 3. 



8. Capsule produced on August 3. 



9. Capsule containing eleven embryos. 



10. The same, enlarged. 



11. Capsule with embryos, enlarged. 



1 2. Development of embryos on August 9, in capsule produced August 3. 



13. Development of embryos on August 9, in capsule produced August 3. 



14. Development of embryos twenty days after production of the capsule. 



15. One of the embryos of the capsule fig. 14, more enlarged. 



16. Capsule containing embryos, 16th August 1843, enlarged. 



17. Variety of Hirudo octo-oculata, crawling. 



18. The same, at rest. 



19. Anterior portion or head of a specimen of the same, shewing the 



distribution of the eyes, enlarged. 



HIRUDO SANGUISUGA The Horse Leech. Plate III. 



This species being so familiar, by name at least, to most people, 

 especially those dwelling in the country, and being so profusely dispersed 



e 



