AND HABITS OF THE AMMOCHARID®. 25 
Or 
When making my sketches, I had neither seen Metschnikoft’s 
nor any other figures of Mitraria, and I had constantly to 
wait until the animal returned to its original position: to this 
fact is due the omission in fig. 18 of the two crescent-shaped 
thickenings of the epidermis figured by Metschnikoff (7. pl. xviii. 
fig. 8), as although they were seen distinctly when drawing other 
parts, no subsequent view enabled me to give their exact form 
and position. 
Upon comparing the figures (17 & 18) with those of Metschni- 
koff (7. pl. xvii. figs. 5 & 8), the chief difference relates to the 
outline of the ciliated margin of the hydrophyllium ; that of my 
specimen was perfectly plain, and, when seen from below, some- 
what oval in outline, whilst Metschnikoff’s figures show the 
margin to be deeply lobed. ‘hat Metschnikoft’s Mitraria is the 
larval form of a species of Ammochares there can, I think, be 
little doubt. Its agreement with that of the English form, 
Owenia, is exceedingly close. 
The lingual organ of the young worm, figured by Metsch- 
nikoff (7. pl. xviii. fig. 12), agrees closely, both in form and 
position, with that of Ammochares, whilst the position of the 
‘“ schleimabsondernde Organe”’ corresponds with that of part of 
a “thread-gland.” The form of the uncinus (7. pl. xviii. fig. 12 4) 
is unmistakably that of the family, though Metsclinikoff’s figure 
of the worm (7. pl. xviii. fig. 12) shows only a single row of 
uncini to each of the “abdominal” segments. The anterior 
smoothly truncated end of the worm, shown in his figure, 
corresponds with what might be expected from Cunningham and 
Ramage’s observation (15. p. 656) that, “‘in small specimens the 
mouth is surrounded by a funnel-shaped lip, quite entire, except 
for a ventral notch,” and that “it is only in the larger speci- 
mens that the branched processes are seen.” Metschnikoft’s 
statements (7. p. 241) that while each of the first three segments 
of his young worm bore on either side a bundle of fine tapering 
sete only, all the other segments were equipped with both sete 
and transverse rows of uncini; that the first eleven sezments 
were extraordinarily long, and distinguishable only by the 
arrangement of the bristles, since the usual segmental cross- 
furrows were absent ; and that the last body-segment ended with 
two roundish little lobes, between which was the anal opening 
(points all in striking agreement with the structure of the 
Ammocharide), convey, in combination with his figure, what 
