1030 MR. R. J. ORTLEPP ON THE 



Thei'e is one pair and an unpaired median ventral papillse in 

 front of ttie anus. These are so placed as to form a triangle with 

 its apex directed towards the anus. Behind the anus there are 

 five pairs of ventral papillas, of which the first two pairs are 

 situated immediately behind the anus. The third pair is placed 

 at the junction of the 1st and 2nd quarters of the tail, whilst the 

 4th and 5th pairs are sitixated further back, and are slightly 

 approximated. Equidistant from these last two pairs there is 

 seen what appears to be a very small papilla, but which probably 

 is the opening of the caudal glands. 



The spicules are only very slightly unequal, the right spicule 

 being the longer and more slender. Some difficulty was en- 

 covmtered in making out their lengths in cleared specimens 

 because of their paleness, and consequently the}^ were dissected 

 out by means of a dissecting microscepe. The left spicule 

 broadens posteriorly to about 90 /x and then gradually tapers to a 

 point ; it is 455 ^ long, and 32 yu broad at its base. The right 

 spicule, which is 475/1, long, and 45 /x broad at its base, tapers 

 gradually to a point, and in all the males examined its posterior 

 extremity was recurved. 



Host : Tiqnncmibis teguexin. Stomach. Bi-azil. 



In addition to the material described above, I have also 

 examined a few specimens from the mouth of a Hog-nosed Snake 

 {Heterodoob platyrhinus, S. America) which I have referred to the 

 above species. They agree with Ph. retusa in practically all 

 respects except in the size of the spicules, which in this material 

 are equal in length and 300 /x, long. Their shapes, however, 

 are identical with those described above. 



(9) Physaloptera MONODENs Molin, 1860. (Text-figs. 13 & 14.) 



The material on which the study of this species is based was 

 collected from Boa constrictor and deposited in bottle 4459 in 

 the Vienna Museum. 



The cuticle is finely striated and completely reflected over 

 the lips. The cervical papillae vary in their position, in some 

 cases being at the level of the hind end of the muscular eso- 

 phagus, and in others as much as 300 /x further back. The 

 execretory pore is situated about 400 /^ behind the muscular 

 oesophagus. 



The lips are dome-shaped, and each bears a small subdoi'sal 

 and subventval external papilla. The two median teeth are of 

 unequal size, the inner one being much smaller ; the outer tooth 

 is sharply conical, the inner foliaceous and tripartite ; they are 

 rather small. 



The muscular oesophagus forms about 1/1 0th of the whole organ, 

 which is about l/5'3 of the body-length in the male and l/8th in 

 the female. The nerve ring encircles its muscular portion in its 

 posterior quarter. 



