1912. | J. HorNELL: Cesiodes from Indian Fishes. 201 
The genital apertures are lateral and placed well forward 
towards the anterior margin; the disposition is very irregularly 
alternate in series, that is, those pertaining to a number of con- 
secutive proglottides, from two to six in number, may all open 
on the same side, to be succeeded by a number which open con- 
secutively on the opposite side. 
Both surfaces of the strobila are closely marked by transverse 
strie; the lateral margins are almost straight, and there is no 
overlapping; sometimes the posterior lateral margin may be 
slightly salient and pointed. 
The diagnosis of this species is as follows :— 
Scolex consisting of a bulbous sub-conical head encircled at 
the base by a cup-like bothridial collar. Four pairs of minute two- 
pronged uncini disposed at equal intervals around the circum- 
ference of the head-bulb; the prongs are sharply bent at mid- 
length and borne upon a common horizontal bar; in young 
specimens a spur-shaped projection occurs opposite the base of the 
outer and longer prong. 
No definite neck. Strobila ligulate, long and stout, 33 cm. 
in dead condition. Narrow at anterior end, I°3 mm., increasing 
slowly and uniformly in width till it attains 4 mm. in front of the 
region of ripening proglottides. 
Proglottides short, five to six times broader than long in the 
wide region posterior to mid-length; ripe proglottides characteris- 
tically short and length never greater than breadth. Grooves of 
segmentation apparent immediately behind bothridial collar. 
Cuticle striated transversely with minute furrows. 
Ovaries arranged centrally in a rosette of large pear-shaped 
lobules. Genital pores lateral, opening well forward and anterior 
to mid-length; disposition irregular, in alternate consecutive series 
of from 2 to 6 on the same side. 
Habitat :—The large intestine of Stegostoma tigrinum (Gmel.), 
Bay of Bengal and Gulf of Manaar. 
The type specimens of this species are deposited in the Indian 
Museum, Calcutta, No. ZEV +4825. 
(3). TETRARHYNCHUS ANNANDALEI, Ni. sp. 
(Pl. x, figs. £3-152). 
Associated with the specimens of Balanobothrium tenax, n. sp., 
described above from the gut of Stegostoma tigrinum (Gmel.) were 
two mature Tetrarhychids. These both measure 3°6 cm. in length 
(dead). 
The head or scolex is well proportioned and about 8 mm. long. 
Anteriorly it has two well-developed simple bothridia of lappet 
form, 2 mm. in length by 1°6 mm. in breadth. They are some- 
what fleshy in appearance, the border thickened and elevated and 
slightly emarginate on the posterior edge. Behind the bothridia, 
the head becomes slender, cylindrical and neck-like, 0°7 mm. wide; 
