DR. T. S. COBBOLD ON THE PARASITES OF ELEPHANTS. 257 



"White, Dr. F. Buchanan, "The New Elephant Parasite," Science Gossip, 1871, p. 234. 

 Williamson, T., "Natural History of the Elephants" &c, in his ' Oriental Field Sports,' London, 

 1807, vol. i. p. 139. 



DESCRIPTION OF THE PLATES. 

 Plate XXIII. 



Fig. 1. Head and neck of a male Sclerostoma sipuncidiforme, showing the double circle of oral denticles, 



buccal cup, oesophagus, retractor muscles, upper part of the chylous intestine, and the sub- 

 dermal vascular network. ( x 33 diam.) 

 Fig. 2. Semiprofile and oblique view of the lower end of the body of a male Sclerostoma sipuncidiforme, 



showing the folded hood, the points of the rays, the vascular network, and the position of the 



spicules in their retracted state. ( X 27 diam.) 

 Fig. 3. Side view of the head and neck of Strongylus clathratus, showing two auriculate folds, the buccal 



cup, and the oesophagus, (x 23 diam.) 

 Fig. 4. Side view of the tail of a male Strongylus clathratus, giving a complete representation of the 



right lobe of the hood and its rays, and also indicating the position of the spicules and caudal 



swelling in front. ( x 23 diam.) 

 Fig. 5. One of the spicules of Strongylus clathratus. (x 40 diam.) 

 Fig. 6. Lower end of the body of a female Sclerostoma sipuncidiforme. ( x 13 diam.) 

 Fig. 7. Another view of the lower end of the body of a female Sclerostoma sipunculiforme, showing the 



altered shape of the tail when seen from the front. ( x 13 diam.) 

 Fig. 8. Additional side view of the tail of the male Sclerostoma sipunculiforme (to contrast with fig. 2), 



showing the altered position aud direction of the spicules when exserted. The vascular 



network omitted. ( x 27 diam.) 

 Fig. 9. Head and neck of Strongylus foliatus, seen from the front, displaying the upper and lower pair 



of papillae, mouth, buccal cup, and long oesophagus. ( x 27 diam.) 

 Fig. 10. Profile view of the left side of the head of Strongylus foliatus, showing auriculate folds of the 



skin. ( x 33 diam.) 

 Fig. 11. Similar representation of the right side of the head of Strongylus foliatus, with the focus altered 



to show the buccal teeth. ( x 33 diam.) 

 Fig. 12. Left side of the lower end of the body of a male Strongylus foliatus, showing the retracted 



spicules, bursal lobes, and entire system of rays on one side. ( x 60 diam.) 

 Fig. 13. Left side of the lower end of the body of a female Strongylus foliatus, showing the anal cleft and 



subulate extremity of the tail, (x 40 diam.) 

 Fig. 14. Head, neck, and upper part of the body of a female Strongylus falcifer , showing especially the 



outer and inner series of oral papilla?. ( x 23 diam.) 



Plate XXIV. 



Fig. 1. Lower end of the body of a male Strongylus falcifer, seen from the front, exposing the inte- 

 rior of the bursa, caudal papilla, lobes of the hood, points of the rays, and more particularly 

 the spicules with their sheaths and retractor muscles attached to the upper end of the blind 

 pouches. ( x 23 diam.) 



