POROCEPHALUS 



735 



Morphology. — Female 9 to 12 centimetres in length and 5 to 9 

 millimetres in breadth, with eighteen to twenty-two rings, each i to 

 2 millimetres in width. The 

 cephalothorax extends from the 

 anterior end of the body to the 

 first body-ring, which is often very 

 indistinct. Dorsally this region 

 is convex, while ventrally it is 

 concave, and carries the mouth, 

 in front of which there are two 



Fig. 353.- 

 Wyman ; 



-Porocephalus armillatus Fig. 354, — Porocephalus armillatus 

 Male, Natural Size. Wyman: Female, Natural Size. 

 (After Sambon.) 



papillae, and on either side of which there are two hooks. Genital 

 opening about i millimetre in front of the anus, which is terminal. 

 Male 3 to 4-5 centimetres in length 

 and 3 to 4 millimetres in breadth, 

 with sixteen to seventeen rings. 

 Genital opening in the middle 



Fig. 355. — Lateral Aspect of 

 THE Cephalothorax of Poro- 

 cepkalus armillatus Wyman. (X 5 •) 



Fig. 356. — Ventral Aspect of 

 the Cephalothorax of Poro- 

 cephalus armillatus Wymat<! . (X5.) 



(After Sambon.) 



of the ventral surface at the anterior end of the abdomen. 



Life-History. — Probably this resembles that of Linguatula serrata, 

 with the difference of hosts. In man the nymphae are found not 



