238 



DE. T. S. COBBOLD OX THE PARASITES OF ELEPHANTS. 



Fie. 6. 



Outline of the tail of a female 



Filaria Smithii : a, anus 



( X 30 diam.). 



of an interior tube (which I took to represent the empty vagina) led me to infer that 

 the outlet is placed about yjjo of an inch below the point of junction of the oesophagus 

 with the chyle-intestine. The oesophagus itself, in the female, 

 measures ^ of an inch in length, and only ^ro m breadth. I 

 subjoin an outline of the female tail. It is here seen strongly 

 bent backwards. Another striking character is that shown by 

 the ova. These minute bodies, linear-oblong in shape, give 

 an average diameter of only ^wo °f an mcu from pole to pole. 

 Each female worm contains a prodigious number of eggs, pro- 

 bably not less than 100,000, exclusive of the unimpregnated 

 ovarian ova. The perfect ovum always exhibits an embryo 

 folded within its excessively delicate chorional envelope. This 

 embryo itself is thicker in front than behind ; hut it is bluntly 



pointed at either extremity. Even at its thickest part the transverse diameter of the 

 body of the embryo scarcely exceeds the giuJo of an inch. 



The head of the male forms a miniature representation of that of the female worm. 

 The difference in thickness in the two sexes is considerable, the body of the female 

 measuring xoo ail( i that of the male about yio 0I " an inch. Seen from the ventral 

 surface, the contour of the tail of the male presents a lanceo- 

 late outline and spatulate form. It displays eight papillae 

 furnished with long stalks (PL XXIV. figs. 8-10). On each 

 side three of the papillae are rooted or arise from above the 

 level of the anal opening, and one originates from below the 

 anus. I did not observe any sessile papillae beneath the 

 stalked papillae. The spicules are always visible, whether par- 

 tially (figs. 8, 9) or wholly retracted (fig. 10). They are 

 strikingly narrow, the anterior spicule being almost twice the 

 length of the posterior. The length of the shorter spicule 

 scarcely exceeds the rhj> whilst the anterior one 

 diameter of fully g^ of an inch. 



Fie. 7. 



gives a long 



Outline of the tail of a male 



Filaria Smithii; a, anus 



(X30 diam.). 



8. Ampeistoma Hawkesii, Cobb. 



A. Hawkesii, Cobbold, The Veterinarian, Oct. 1875; ibid. Nov. 1875; also in Treatise on Parasites, 



1879, p. 395. 

 A. Collinsii, var. Starileyi, Cobb., Parasites, 1879, p. 357. 

 Masuri or Mussoorie of the Hindoo Mahouts (Gilchrist, Hawkes, &c.). 



Body of a pink colour, smooth, plano-convex, finely wrinkled transversely, bluntly 

 pointed and contracted in front, broadly rounded behind. Head surrounded by a few 

 regular but not well pronounced folds, armed with numerous short and extremely 

 minute warty papillae. Mouth terminal, circular. Ventral surface often slightly 

 depressed near the centre, forming slight prominences on either side. Caudal sticker 

 placed well forward, rather large, circular, with a broad lip and smooth concavity. 



