Dr. Baird on new species of Entozoa. 73 



Order Acanthotheca. 

 Genus Pentastoma. 



1. Pentastoma megacephalum. 



Pentastoma megacephalum, Baird, Cat. Entoz. Brit. Mus. 39. t. 2. 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 and very prominent in 

 the centre and transversely ridged. The ventral surface is more 

 flattened, ridged and wrinkled ; with the mouth in a hollow depres- 

 sion, surrounded by four strong, brown, simple hooks. The part 

 of the body immediately beneath the head is very strongly ridged 

 transversely, each of the first six ridges being wavedly wrinkled. 

 The length of the whole body is about 1 1 lines. The head is 5 lines 

 broad, and the middle portion of the body about 3y lines, dimi- 

 nishing in size towards the tail. The oviduct is very long, the por- 

 tion outside the body being 2 inches in length. 



Male ? Longer than female, about 1 4 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 in length and 

 brown at the tip (the penis?). 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, from India. Brit. Mus. 



2. Pentastoma annulatum. 



Pentastoma annulatum^ Baird, Cat. Entoz. Brit. Mus. 113. 



Body white, elongate-cylindrical, nearly of the same size at each 

 extremity, strongly ringed ; rings raised, about twenty-eight in 

 number, one line distant from each other. A dark blue line runs 

 through the whole length of body on one side. Circumference of 

 body 5 lines, length of body 2^ inches. 



Hab. In the lungs of the Egyptian Cobra, Naja Haje. Collection 

 of Dr. Crisp. 



Order Trematoda. 

 Genus DisTOMA. 



1. DiSTOMA MICROCEPHALUM. 



Bistoma microcephalum, Baird, Cat. Entoz. Brit. Mus. .58. t. 2. f. 2. 



Body of an elongated oval or lanceolate shape, of a slightly yellow- 

 ish white colour, plicated transversely, the folds being very fine ; 

 head narrow, obtuse, separated from the body by a contraction; pos- 

 terior extremity obtusely lanceolate ; dorsal surface slightly convex ; 

 ventral surface nearly flat or somewhat concave ; anterior sucker 

 small, terminal ; ventral sucker larger, round, prominent, sur- 

 rounded by an elevated thickened edge, and situated within 3 milli- 

 metres of the former ; organs of generation placed balf-way between 



