198 Records of the Indian Museum. (Vor. VII, 
In anterior view the scolex appears sub-quadrangular, the 
thickened anterior extremities of the bothridia forming the four 
angles; as seen in figure 2 the bothridia extend some distance 
towards the centre of the ‘‘head,” by their slight prominence 
forming a distinct cruciform depression upon the apical surface. 
The thickened anterior extremity of each bothrium bears a pair 
of double hooks; each consists of two sub-equal slightly curved 
long and slender prongs fused together by their bases. The curve 
in each prong is double—a light divergent curve from its fellow 
and a somewhat abrupt or right-angled curve on the under side 
whereby its holding power in attachment is increased. The acute- 
angled apex of the base of each double hook is approximated to 
that of its fellow in the same pair. The prongs project consider- 
ably and overhang slightly the anterior margin of the proximal 
bothridial loculi. In colour the hooks are dark brown and in 
appearance are chitinous. No accessory suckers or acetabula are 
present, thus differentiating this genus from the otherwise closely 
allied Calliobothrium. 
The neck is very long and slender; about 0°4 mm. broad. 
The proglottides are extremely numerous and always markedly 
broader than their length. ‘The width of the great majority, 0°75 
to 07g mm., is characteristically almost twice as great as the length; 
a few at the posterior extremity as they ripen become somewhat 
more elongate and narrower. The lateral edge of the proglot- 
tides is slightly curved, the posterior margin very slightly produced 
and overlapping the front edge of the next succeeding. The 
genital pores are lateral. The general appearance and proportions 
of the strobila thus approximate closely to what is seen in 
P. trygonis, Shipley and Hornell. 
It is noteworthy that the stomach contents of the host. which 
vielded this cestode consisted (with the exception of a fragment of 
a Nemertine) of a great mass of one or more species of Amphioxus ; 
there were hundreds of individuals in the mass. Other parasites 
present were Tyloccphalum uarnak, Shipley and Hornell, in great 
numbers, a single specimen of Tetrarhynchus etobatides, and nu- 
merous individuals of an undetermined Nematode. 
The dimensions of the host were :— 
Length of body to base of tail He ar Sch aie 
Breadth of disc ae it dite Qette Powmnt 
Length of tail ths Wes Pred fe Sei Primoye 0h, 
The diagnosis of P. urogymmi, n. sp., is as follows :—Long 
slender cestode. Head elongated, twice as long as broad, armed 
with four large sessile, elongated and regularly disposed bothridia, 
each sub-lanceolate and trilocular with mobile edges and posterior 
tip; anterior extremity of each bothrium tumid, armed with a 
pair of double dark brown chitinous hooks. Prongs of each hook 
slender, equal, curved in two planes, the tips projecting beyond 
the anterior margin of the proximal loculus. 
