1042 ME, R. 3. ORTLEPP ON THE 



the body, dividing it in the ratio of 7 : 8 ; it leads into a straight 

 vagina 1-3 mm. long, which is directed posteriorly ; it then turns 

 forwards to join the trunk, which in its middle bends back again ; 

 it is 3'5 mm., long and its anterior half is only slightly difiei- 

 entiated into an egg-chamber ; the posterior end of the common 

 trunk divides to give rise to the two uteri. The uteri pass 

 posteriorly almost to the hind end of the body, then pass 

 forwards before joining the oviducts and ovaries, which in their 

 turn pass backwards again. 



The body is terminated by a short and rounded tail forming 

 nearly 1/1 90th part of the body-length. 



The eggs are long, oval, and thick-shelled, measuring 59 /a long, 

 32 ju broad, the thickness of the shell being 5 fx. 



Male. 



The males average about 22 mm. long by 325 fj. broad in their 

 middle. 



The bursa is not sharply set off from the body, and is only 

 slightly broader than it ; it forms about l/28th of the body- 

 length ; it is little more than twice as long as it is broad, and its 

 ventral surface is devoid of cuticular markings. 



The four pairs of stalked papillse are all pre-anal in position, 

 and arranged in two widely-separated groups of two pairs each. 

 No ventral pre-anal papillfe were seen. Behind the anus there 

 are four pairs of shortly stalked papillse, which are equidistant 

 from each other and from the anus. They are sitiuated somewhat 

 laterally. 



The spicules are unequal, the left being neai-ly twice as long as 

 the right ; the left spicule is slender, and tapers to a fine point ; 

 it is 546 ju long by 22^ broad at its base; the right spicule is 

 from 228 to 300 jx long by 32 /m broad at its base ; near its base it 

 has a distinct neck, after Vv^hich it widens out and then tapers to 

 an obtuse point. 



Host: "Snakes." Australia. 



Types in the Helminthological Department of the London 

 School of Tropical Medicine. 



Discussion. — This species is easily separated fiom all the 

 didelphoid Physaloptera '1) by the arrangement of the stalked 

 bursal papillse, these being entirely pre-anal and arranged in two 

 widely-separated groups in this species; (2) by the aiTangement 

 and number of the post-anal ventral papillse ; and (3) by the 

 entire absence of cuticular maikings on the ventral sui-face of 

 the tail of the male. 



The elongate and slender body shows some similarity to 

 P7i. yracilis, sp. n., from which species it is, however, quite 

 distinct, as shown by the above-named three characters ; it 

 also differs from this species by the diffei-ence in shape of its lips 

 and teeth, by the more posterior position of its vulva, and by 

 its larger spicules. 



