210 Mr Shipley, On a new species of Bothriocephalus. 
My specimens from the intestine of Histiophorus sp. undoubt- 
edly belong to the sub-family Ptychobothriinae and to the genus 
Bothriocephalus as restricted by Ltihe. The scolex is unarmed, 
and provided with longitudinal slit-like depressions which hardly 
attain the dignity of suckers situated in the dorsal and ventral 
plane. Laterally and more anteriorly is a still slighter depression. 
The anterior end of the scolex bears a flat cap something like a 
cook’s cap but with four distinct lobes, symmetrically placed, two 
right and two left. Posteriorly the head is slightly constricted 
and then it expands again to terminate in a marked rim. (Fig. 1.) 
There is no neck. The segments are anteriorly rather funnel- 
shaped with markedly salient angles. Towards the middle of the 
body the segments become much broader than long, but quite at 
the posterior end they lengthen again. The edges of the first 
six to ten segments which overlap for some distance the suc- 
ceeding segment are divided up into four lobes but this lobation 
disappears behind. The posterior border of the last segment is 
rounded. The salient edges of the posterior border of the 
anterior segments overlap the succeeding proglottis for almost 
half its length. 
The head is 1*5 mm. in length and l’4mm. to the constriction 
mentioned above, its breadth at the anterior end which bears the 
four-lobed cap is *4 mm. The measurements of the proglottides 
vary very much in different regions of the body. The longest 
are those of the anterior third where a length of *3 mm. is attained. 
Further back the segments shorten and broaden till they acquire 
the dimensions of about ’5 mm. broad by T6 mm. long. 
The ovary lies across the hinder part of the proglottis, and is 
produced into numerous rounded lobes. The ova are closely 
crammed together at the periphery but in the centre of the organ 
in the middle line the ova are more loosely packed and more 
spherical in outline and have passed into the chamber called 
the ootype. Their diameter here is some *015 mm. Into this 
region opens the small shell-gland, and the ducts of the yolk 
glands. The shell-gland lies posteriorly to the ovary between 
the right and left halves of that organ and with the ducts of 
the yolk glands it opens into the ootype posteriorly. From the 
ootype the uterus arises and makes a few turns, coiling right and 
left and then opens into what the Germans call the “uterushohle” 
or uterus-sac, a large spherical expansion of the uterus which 
opens by a very definite pore on the ventral surface of the pro- 
glottis. The difference between the spherical eggs in the ootype 
and those in the uterus is striking. The former are much smaller, 
well stained, with conspicuous nuclei and '015 mm. in diameter, 
the latter are enclosed in a bright yellow egg-shell of an oval 
shape impenetrable to staining fluids, 045 mm. long by *035 mm. 
