22 
transversely, each of the first six 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 about 35 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 14 lines long; covered with a 
smooth skin which is slightly ridged across, and has at its inferior 
extremity a small sharp papilla, about 2 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. (Annulosa, Pl. XXX. fig. 7.) 
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 Haye. Collection 
of Dr. Crisp. 
Order TREMATODA. 
Genus Distoma. 
1. DistoMA MICROCEPHALUM. 
Distoma 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 surtace slightly convex ; 
ventral surface nearly flat or somewhat concave ; anterior sucker 
small, terminal; ventral sucker larger, round, prominent, sur- 
rounded by au elevated thickened edge, and situated within 3 milli- 
metres of the former; organs of generation placed half-way between 
the two suckers in the form of an elevated papilla. Length from 6 to 8 
lines, greatest breadth 1} line. 
Hab. Stomach of the spinous Shark, Acanthias vulgaris, from 
Falmouth Harbour. Brit. Mus. 
Order CesTorpEA. 
Genus TETRARHYNCHUS. 
1. TeTRARHYNCHUS RUGOSUS. 
Tetrarhynchus rugosus, Baird, Cat. Entoz. Brit. Mus. 69, t. 2. f. 3. 
Body flattish, thick, exceedingly rugose, almost tuberculated, the 
ruge extending right across the body, which is of a white colour. 
