48 OF THE PRINCIPAL WORMS 



apoda.liGy) It has been pretended that this was 

 the same worm as that found in men by Waaler 

 and by Roederer ; but the last examination has 

 evinced that the head of the tricocephalus of th^ 

 lacerta apoda was crowned with small fangs, be- 

 sides other peculiarities of structurej(468) never ob- 

 served in the human tricocephalus. 



On this subject Goeze says that the tricocepha- 

 lus of Pallas should be regarded as a link, which^ 

 in the series of intestinal worms, unites the trico- 

 cephali with the G ratteurs, {iQQ) or Echinorynchi. 



FOURTH GENUS. 



THE ASCARIS VERMICULARIS. 



§. XXXV. This worm, like the lumbricoides, 

 of which we shall presently speak, belongs, accord- 

 ing to naturalists, to the same genus ; they ought 

 consequently to be described under the same arti- 

 cle. If we however inspect these two worms, when 

 brought together, we shall perceive material differ- 

 ences between the size and length of the body of 

 the ascaris vermicularis and of the lumbricofdes, 

 and in the place these worms occupy in the intestines, 

 which is not common to both, as well as in relation 

 to the symptoms which they severally produce ;(170) 

 it seems to me that physicians should examine 

 them separately, as has been done by most practi- 

 tioners who have spoken of worms.(171) 



§ XXXVI. The ascaris vermicularis, which 

 has received divers names by authors.(47S) is a 



