198 General Notes. [ Feb, 
this tubular ligament merged imperceptibly into the proboscis, 
and t uid interior with granules became the interior of the 
inverted EA with, at first small wie scattered rod-like 
hooks, and towards the apex of the inverted proboscis, with 
normal hooks attached to the inner parietes 
The front end of the long and slender contractile bulbs lies 
about 10 mm. back of the apex of the head; length 2.46 mm.; 
breadth 0.24 mm. The contractile bulbs, as in all the Trypano- 
rhyncha, are thick-walled. The walls are composed of diagonal 
muscular fibres, which interlace, making angles 2 about 70° and 
110° with each other. These organs act in much the same 
manner as the bulb of a syringe. By their penen the fluid 
contents is forced into the proboscis-sheaths and proboscides. 
The column of fluid thus forced into the proboscides causes them 
nated from the apex. When the embryo was first liberated the 
proboscides were entirely retracted; when, however, pressure 
was applied, they unrolled. In this condition the proboscides are 
very beautiful objects, being quite transparent, while the chitinous 
hooks have a brilliant vitreous lustre. When fully extended the 
proboscides throw themselves into graceful spiral curves. When 
e pressure is released they are apt to be withdrawn. 
e bothria, in life, are transparent, finely granular, with a few 
maiie refractile globular masses similar to those in the walls 
of the blastocyst. The tubular neck, when flattened under the 
tudinal muscles, and outside of this a layer of vascular tissue, 
in which the reticulated vessels of the water vascular system 
nearly as can be ascertained without stained sections, consists of 
oriens muscular fibres. 
water vascular system consists of a net-work of vessels 
in he tra of the bothria which connects with large sinuous 
— in the centre of the head, and together with these with 
he reticulated subcuticular vessels of the neck. Back of the 
cnet bulbs the system is represented by two pairs of 
: a lie in sinuous curves near each edge of the em- 
bryo. One ' these ne was _— larger ‘in the others, 
€ ed in a bulbous enlar 
the contractile bulba. E e body has the appearance of 
sac, filled with poe — e with the 
