636 DR. H. CHABLTON BA8TIAN ON THE ANATOMY AKD PHYSIOLOGY 



|Fig. 12. Posterior extremity of same : — a, caecal termination of posterior branch ; b, left 

 lateral caudal pore ; c, anal cleft. 



Tig. 13. Transverse section through body of same species in oesophageal region: — a, a, 

 lateral bands ; b, b, large axial vessels ; c, oesophagus ; d, d, thickenings of 

 lining membrane forming longitudinal bands ; e, e, muscle-cells. 



Fig. 14. Lateral aspect of portion o£ Trichosoma longicolle : — a, a, segmented oesophagus ; 

 b, small lumen of same ; c, one of oesophageal appendages ; d, intestine ; e, e, 

 ova, within oviduct ; /, /, integumental pores over situation of mid-ventral 

 cellular band (g) ; h, mid-dorsal band. 



Fig. 15. Magnified representation of integument in the situation of the peculiar dorsal 

 band of Trichocephalus dispar. 



Fig. 16. Portion of same near its termination, showing the integumental channels under 

 different aspects — on the right-hand side they are seen as when looked down 

 upon in the du-ection of their length, and on the left hand in intermediate 

 positions between this and a direction at right angles to it. 



Fig. 17. Portion of integument over and adjoining dorsal band oi Trichocephalus affinis, 

 showing, as in fig. 15, the cessation of transverse markings at border of band. 



Fig. 18. Transverse section of same through anterior part of oesophageal region of body, 

 showing the broad dorsal band consisting of integumental chaimels in con- 

 nexion with a subjacent loculated cellular structure ; no muscles covering this 

 band internally, and nearly the whole of cavity of body occupied by the oeso- 

 phagus, with narrow central lumen and thick cellular parietes. 



Fig. 19, Portion of posterior part of oesophagus of same. 



Fig. 20. Caudal extremity of adult Bracunculus medhiensis : — a, anus ; b, intestine ; c, 

 right lateral caudal pore*. 



Fig. 21. Portion of integument with one of caudal pores, more highly magnified. 



Fig. 22. Posterior extremity of young Guineaworm : — a, anus ; b, intestine ; c, right 

 lateral caudal pore ; d, outline of internal sac in connexion vnth same. 



Fig. 23. Dorsal aspect of lateral caudal pores of same, with their attached sacculi. 



Fig. 24. Lateral aspect of anterior extremity of young Guineaworm, shovring (a) a rudi- 

 mentary mid-ventral pore. 



Feee Nematoids. 



PLATE XXVIII. 



Fig. 1. Female Dorylaimus stagnalis. 

 Fig. 2. Male of same species. 



Fig. 3. Anterior extremity of same species more highly magnified, ventral aspect: — 

 a, a, deciduous portion of spear ; b, central framework through which it 



* In Plate XXV. figs. 14 & 15, other points in the anatomy of this animal are illustrated. 



