518 Georgina Stveet 



Lengtli . - . . - 

 Diameter of head 



,, ,, 1 uuH. buck 



Maximum diameter of l)ody (near 



middle . - - - 



Length of tesophagus - - - 



Length of intestinal diverticulum 

 Diameter of body, 1 mm. from 



posterioi- end 

 Diameter at anal apertui'e - 

 Tail (anus to tip) length 



The body tapers both anteriorly and posteriorly, but more 

 gradually anteriorly. The head end is also often less sharply 

 coiled than the remainder of the body. The tail is short and 

 conical, the extreme tip being mucronate with transverse ridges. 

 The body has regular and fine transverse striations. On the 

 head one can occasionally make out a more or less rudimentary 

 division into 3 lips, which, however, is often quite obscure. 

 Only rarely are head papillae visible, but on the anterior face 

 of the head is a minute conical spine with spreading base, 

 resembling in outline that of the spine on a placoid fish scale, 

 the obtuse apex being directed outwards. jVo alae are to be 

 seen as a rule (though one specimen has one .033 mm. in width, 

 the tail of this form being short), nor postanal nor preanal 

 papillae. 



In the three specimens of which the sizes are given above, A 

 with a short tail has no papillae and very indistinct lips, B, 

 also with a short tail, has 3 distinct lips and rudimentary 

 papillae, C with a long tail has no papillae and fairly distinct 

 lips. 



A well-marked diverticulum p;isses forwards from the intestine 

 where it joins the constricted oesophagus, and lies alongside the 

 latter. The diameter of this diverticulum is greater than that 

 of the intestine itself, and com])letely hides the oesophagus from 

 view where it is present. No reproductive organs could be 

 detected. I have been unable to find any pearl-like concretion 



