AN ATTEMPT TO REVISE THE FAMILY « LINGUATULIDAE )) 



69 



whose dimensions correspond with those given above, and those 

 whicli are about half the size ; possibly the latter are larval forms . 



10. — POROCEPHALUS HETERODONTIS Lcuckart, 



Synonym. — Pentastomum heterodontis Leuckart. 



DiAGNOsis. — (( Species, quam in statu imper- 

 fecto solo hucusque observavimus, corpus 

 exliibet cylindricum, postice attenuatum, 

 antice clavatum. Frons rotundata, clavata. 

 Articuli c. 58, brevissimi, fimbriati, stigmati- 

 bus unicum seriem formantibus perforati. 

 Hamuli geminati, inaequales, altero (accesso- 

 rio) graciliore, altero (principali) valido, crasso 

 bene curvato. Fulcrum latum, elongatum , 

 rotundatum. Longit. corporis 6,3 mm., latit. 

 0,65 mm. » — Leuckart. 



Habitat. — In capsules in the abdominal 

 muscles and the peritoneum of Heterodon sp: 



Fig. 13. — Hook of 

 Porocephalus 

 heterodontis Leuc- 

 kart X 173. After 

 Leuckart. 



11 



Porocephalus lari Mégnin 



Synonym. — Pentastomum lari Mégnin. 



DiAGNOsis.. — Cylindrical, posterior end curved and stouter than 

 anterior end which tapers. Rings 

 only marked by slight undula- 

 ting striae. Two latéral and ter- 

 minal tubercles on the head. 

 Mouthoval,situated betweenthe 

 anterior limbs of a cross-like 

 chitinous armature, in the left 

 angle of this cross is a small 

 sucker-like dise. The inner pair 

 of hooks are on the second an- 

 nulus, the outer on the third. 



Length of female 6 cms, breadtli 3 mm. 



Fig. 14. — Porocephalus lari Mégnin. 

 — A, anterior end of body X 30 ; 

 B, hook X 133. 



(1) Bull. Soc. Zool, de France, VIII, 1883, p. i;i3, plate VII, fig. 3 nnd 4. 



