0NCH0B0THRIID.E. 39 



Pentastoma emarginatum, Rudolphi, Synopsis, 124 & 433, n. 3 ; 

 Beslongchamps, Encyc. Meth. Vers, 612. 



Hab. Liver of the Goat, Caper hircus. 



From the collection of M. Siebold. 



3. Pentastoma megacephalum, Baird, Tab. ii. f. 1. 



Female : body yellowish-white, somewhat depressed and termi- 

 nating anteriorly in a large, thick, club-shaped head. The 

 dorsal surface is depressed at the edges, rounded in the centre, 

 and transversely ridged. The head or dorsal surface is round 

 and very prominent, also ridged across and wrinkled. The 

 ventral surface is more flattened, ridged and wrinkled, with the 

 mouth in a hollow depression surrounded with four strong, 

 brown, simple hooks. The part of the body immediately be- 

 neath the head is very strongly ridged transversely, each of the 

 six first ridges being wavedly wrinkled. The length of the 

 whole body is about 11 lines. The head is 5 lines broad, and 

 the middle portion of the body is about 3^ lines, diminishing 

 in size as it reaches the tail. The oviduct is very long, the por- 

 tion outside the body being 2 inches in length. 



Male ? longer than female, about 14 lines long, covered with a 

 smooth skin, which is slightly ridged across and has at its 

 inferior extremity a small sharp papilla about f of a line long, 

 and brown at the tip (the penis V) the inferior extremity is rounder 

 than in the female, but otherwise the form of the animal is 

 nearly the same. 



Hab. Imbedded in the flesh of the head of a Soonderbund Croco- 

 dile, Crocodilus palustris. 



Presented by W. Masters, Esq. 



Order III. TREMATODA. 



Saugwurmer, Zeder. 



Trematoda, Rudolphi, Bremser, Cuvier, Diesing, Bujardin, <&c. 



Vers Heteromorphes, Lamarck, An. 8. Vert. iii. 



Porocephala, Blainville, Bid. Sc. Nat. lvii. 



Sterelmintha (part), Owen. 



Family I. ONCHOBOTHRIID^E. 



Onchobothriens, Bujardin. 



