236 DE. T. S. COBBOLD ON THE PARASITES OF ELEPHANTS. 



from this ruptured envelope. The embryo measured - 7 \- of an inch long by something less 

 than -5^0 of an inch in breadth. Although there were no intermediate stages observed 

 between the two kinds of ovum, I could not regard the presence of the much longer egg 

 and its embryo as merely resulting from accident. Before I examined these worms they 

 had been carefully separated from the other nematodes. As regards the uterus itself, I 

 have only to add that the two horns may be easily traced downwards to their junctions 

 together and with the oviducal or vaginal passage (PI. XXIV. fig. 3). Distinct 

 openings, with very slightly elevated margins, mark alike the position of the vulva and 

 the anal aperture. 



6. Dochmitjs Sangeri, sp. nov. (Plate XXIV. figs. 4-0.) 



Body smooth, transversely striated, and narrowed both in front and behind. Head 

 very distinct, and bent well forward. Mouth simple, oval, and surrounded by regularly 

 disposed elevations; buccal cup capacious, and armed with a few small teeth; pharynx 

 distinct, separated from the oesophagus by a well-defined constriction. Bursa obscurely 

 three-lobed, the posterior ray being slender and bifurcated at the extremity, its inner 

 branch extending to the border of the membrane. Spicules short, nearly equal. Tail 

 of the female long and pointed, the tip being subulate, and armed with a short, filiform, 

 transparent, and finely pointed appendage. Anus situated at the base of the tail. 



Length of the male 8 lines. 

 Length of the female 10 lines. 



Hob. Intestines of Eleplias indicus. 



On the 24th of August 1870, I discovered large numbers of these small worms in the 

 intestinal canal of the Circus Elephant already referred to. To the naked eye they look 

 like ordinary thread-worms ; but a band-lens is sufficient to demonstrate their strongyloid 

 character. The parts about the mouth were not well made out ; but my representation 

 of the head is perhaps sufficiently characteristic (PL XXIV. fig. 4). 



In its retracted condition the tail of the male worm, when its end is directed towards 

 the spectator, presents a distinctly hexagonal outline, the incurved points of the rays of 

 the hood creating six well-marked angular projections. The appearance in question is 

 at once both striking and delusive. "When the hood is flattened or artificially expanded, 

 then an oval or more or less heart-shaped outline results (PL XXIV. fig. 5). After 

 repeated examinations I constructed the following diagram. The anterior ray (a) is 

 double, and has the divisions closely applied ; it is bent forward Fi^. 5. 



towards the axis of the body. The antero -lateral is simple, normal, 

 and also bent forward. The middle ray (c, d) is dichotomous, 

 and directed at a right angle to the axis of the hood. The postero- 

 lateral ray (d) is simple, long and narrow, but does not reach the 

 margin of the membrane. The posterior ray (e) is characteristic of 

 the species, being long, narrow, and divided near its end into two 



mi 1 ! • t • n i.i Diagram of the hood and rays 



unequal portions. The inner branch is nearly twice as long as the f Dochmius Sangeri 

 outer, and extends to the border of the membrane. When the ( x 30 dliim ')- 



hood is expanded the end of the posterior ray is widely, because divergently, separated 



