Dixon — On Two Irish Specimens of Edwardsia timicla. 103 



Scapus — (1) Investment ; brownish-orange for two-thirds of its 

 entire length ; at the anterior end it grows darker, till it becomes 

 almost black at the top. 



(2) Body-wall — pellucid pale pinkish flesh-colour, showing the 

 insertions of the septa as whitish longitudinal lines. When the 

 scapus is much distended the orange convoluted edges of the 

 mesenteries may be seen hanging free in the interior. 



Capitulum — transparent brownish red, deeper above, paler 

 below ; each invection bears an arrow-head mark of pure opaque 

 cream-white pointing upwards, and about one-third of the total 

 length of the capitulum below the tentacles. Between these arrow- 

 heads and the scapus, on either side of each invection, closely 

 adjoining the arrow flutings, there is an opaque white linear spot, 

 running parallel to the direction of the flutings. When the animal 

 is viewed by direct light, the flutings and invections seem to be 

 separated by lines of transparent white ; but when the animal is 

 seen by transmitted light these markings disappear, and the opaque 

 marks mentioned above seem black. The red colour of the oesopha- 

 gus may be seen through the body-wall of the capitulum. When 

 the animal is contracting, rings of pale brownish-red appear to 

 encircle the capitulum, and are especially conspicuous across the 

 white arrow-heads. These rings are really wrinkles caused by the 

 process of contraction. Their presence proves that the white marks 

 are imbedded in the substance of the body-wall. Sometimes the 

 white colouring on the disk shines through the tentacles so as to 

 be quite visible at the margin, when the animal is seen from the 

 side. This effect, at the first view, would almost lead one to sup- 

 pose that the margin, or top of the capitulum, or the back of the 

 tentacle foot, was marked with a white band ; but this is not really 

 so, the back of the tentacle foot and the margin being quite mono- 

 chromatic. 



Tentacles — brownish-red, transparent, apparently with a core of 

 the same colour, only denser. No bands or markings are present, 

 the colour being uniform throughout. 



Disk a — cream- white, with the eight septa showing through as 

 brownish-red lines; the gonidial and gonidular tentacles have a 

 dense white blotch at their base, but no other mark. Each of the 

 remaining six primary tentacles has a band of white which encloses 

 the front, but does not extend round to the back of its foot. Below 



