628 DR. H. CHAELTON BASTIAN ON THE ANAT05IY AND PHYSIOLOGY 



Fig. 3. Anterior extremity of same, lateral aspect : — letters a-e same as in figure 1 ; 

 f, mid-ventral pore ; (j, rudimentary gland in connexion with same. 



Fig. 4. Anterior extremity of a half-grown specimen of Ascaris spiculigera, showing 

 lateral cervical pores («, a,) and one of smaller intermediate head-lobes. 



Fig. 5. Ventral aspect of posterior extremity of same specimen : — «, «, lateral caudal 

 pores opening into well-marked surface depressions ; h, anal cleft ; c, c, lateral 

 bands. 



Fig. 6. Anterior extremity of Ascaris piscium, from the Haddock: — a, a, two of the four 

 head papillie; b, left lateral band; c, its axial unbranched vessel, which 

 opens externally at d. 



Fig. 7. External aspect of lateral band and its contained vessel, more highly magnified : 

 — a, a, large, highly refractive particles in the band itself; b, undulating axial 

 vessel, with an appearance of imperfect septa or bridles at intervals. 



Fig. 8. Transverse section of same species, showing vessel in left lateral band only, and 

 thick glandular walled intestine (a) as in Plate XXVI. fig. 10. 



Fig. 9. Contiguous portions of oesophagus and intestinal canal of same species, showing 

 an oesophageal caecum directed posteriorly («), and an intestinal caecum ante- 

 riorly (b). 



Fig. 10. Lateral aspect of anterior extremity of Ileterakis vesicularis: — a, mid-ventral 

 pore communicating with a wide tube ; b, much narrower lateral band. 



Fig. 11. Anterior extremity of Heterakis acuminata: — showing (a) a large transverse 

 mid-ventral aperture in communication with the dilated extremity of an excre- 

 tory tube. 



Fig. 12. Portion of integument of same, more highly magnified, showing two of lateral 

 pores. 



Fig. 13. Posterior extremity of male of same species: — «, single slipper-shaped spicule; 

 b, b, well-marked ventral suckers ; c, c, integumental channels ; d, d, pale 

 internal bands, probably muscular ; e, seminal tube ; f, intestine. 



Fig. 14. Ascaris lumbricoides, dorsal aspect of anterior extremity : — a, a, anterior latero- 

 cervical pores ; b, b, suctorial papillae of dorsal head-lobe ; c, c, large pores on 

 latero-ventral head-lobes ; e, e, e', fine channels through the anterior borders 

 of the head-lobes ; f, f, lateral bands in relation with the cervical pores. 



Fig. 15. Ventral view of the posterior extremity of the same: — a, anal cleft; 5, i, latero- 

 ventral caudal pores ; c, c, lateral bands. 



Fig. 16. One of cervical integumental channels, more highly magnified. 



Fig. 17. Side view of a portion of dorsal head-lobe : — a, cliitinous portion of integument ; 

 b, one of suctorial papillae ; c, deep cellulo-granular layer of integument. 



Fig. 18. Side view of a portion of one of latero-ventral head-lobes : — a and c, same as in 

 last figure ; d, large pore ; e, one of anterior, fine integumental channels. 



Fig. 19. Anterior extremity of same, lateral aspect : — g, ventral pore; Ji, sheath of exit- 

 tube of lateral vessels. Other references same as in fig. 14. 



