310 



ON THE NEMATODE FAMILY GNATHOSTOMIDiE. 



Explanation o f Lettering of Text-figures and Plates. 



a., button-like appendage of cervical 



sac. 

 h., balloiiet. 

 h.c, cavity of ballonet. 



c, collar. 

 C.JO., cervical papilla. 

 C.S., cervical sac. 

 c.s.n., neck of cervical sac. 



c.t., cuticular tbickeuing. 

 ccl.p., caudal papilla. 

 e.p., excretory pore. 

 e.s., egg-sac. 



Ji., books. 

 Ii.h., bead-bulb. 

 h.m., bead-muscle. 

 L, lip. 



l.p.n., 

 n.r., 

 oes., 



r.g., 

 s., 



ser., 

 s.m.p., 



s.m.p n., 

 sp., 



lateral 



nerve of lateral papilla, 

 nerve-ring, 

 oesopbagus. 

 rectal glands, 

 spines, 

 serrations, 

 submedian papilla, 

 nerve of submedian papilla, 

 spicule. 



sucker-like depression. 

 L, t., teeth. 

 tJ., termination of tail. 

 iit., uterus. 



v., vulva. 

 va., vagina. 



6. Spiro.vys gangetica. 



EXPLANATION OF PLATES I.-VIII. 



P'ig. 1. Spiroxijs contorta. The bead; dorsal (or ventral) view. 



2. ,, „ Tbe bead ; lateral view. 



3. „ ,, Tail of male ; ventral . view. (Right spicule broken). 



4. „ 5, Tail of male ; lateral view. 



5. „ „ Tail of male ; lateral view, at a higher magnification, 

 to show tbe papillae. 



The bead ; dorsal (or ventral) view. 

 Tbe bead ; lateral view. 

 Caudal extremity of male; ventral view. 

 Caudal extremity of male; lateral view. 

 Terminal portion of spicule. 

 The bead ; nearly dorsal view. 

 ,, Tail of male ; ventral view. 

 „ „ Tail of male ; lateral view. 

 Tnnqua anomala. Tail of male ; lateral view. 

 Tanqua diadema. Tail of male ; ventral view. 



,, „ Tail of male: lateral view. 



JEchinocephalus spinosissimiis. Tail of male; nearl.y ventral view. 



Terminal portion of spicule. 

 Tbe lips ; dorsal (or ventral) view. 

 One of the lips: lateral view. The cuticular 



thickenings are seen b}'- transparency. 

 Tail of male; ventral view. 

 Tail of male ; lateral view. 

 Terminal portion of spicule. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 



Tanqiia tiara. 



lEcJiinocephahts southwelli. 



21. 

 22. 

 23.' 

 24. 



27. 



33. 

 34. 

 35. 

 36. 

 37. 

 38. 



hiatlinstoma spinigerum. 



EcJiinocepJtalus multidevtaUis. The lips; dorsal (or ventral) view. 



„ „ One of the lips ; lateral view. The teeth 



are seen hy transparency. 

 „ „ Tail of male ; ventral view. 



„ „ Tail of male ; lateral view. 



Terminal portion of spicule. 

 Anterior end : latei'al view (optical section). 

 Surface view of one of the cervical papillse, 



surrounded by spines. 

 Profile view of one of the cervical papillse. 

 Tail of male ; ventral view. On the left-hand 

 side of the drawing most of the spines 

 have been omitted. 

 Tail of male ; lateral view. 

 Tbe spicules. 



Terminal portion of left spicule. 

 Tail of female ; ventral view. 

 Tail of female ; lateral view. 

 Ova, some with embryos escaping, 



