Miscellaneous. 179 
It is consequently with great pleasure that I am able to figure for 
the first time a beautiful Mttraria-like larva, which is found in 
abundance in the cold waters of the Bay of Fundy. ‘This larva does 
not occur south of Cape Cod, although it is represented in the waters 
of Massachusetts Bay at Provincetown, Mass, It is differentin form 
from the European representative, of which, in truth, considering 
the part which it has played in discussion of the affinities of larval 
forms of animals, too little is known. 
My new larva was first taken by means of the drag-net or tow- 
net in the summer of 1886. [I first found it at Frye’s Island, New 
Brunswick, and afterwards it was taken at Grand Manan. The 
larva occurred in countless multitudes in July, and later decreased 
in numbers, but was collected far into August. Later than August, 
however, I ene never seen Mitraria in the nets, although it may 
and probably does last long intothe autumn. The following descrip- 
tion will give an idea of the general contour and structure of the 
body of my new larva. 
The body (Pl. VII. fig. 4) is hat-shaped, with a narrow rim, 
gelatinous and transparent. When contracted the equatorial rim 
or belt of the worm is aan to the body, imparting a spherical form 
to the animal. 
There are two ciliated regions of the body. One of these is situ- 
ated at the apex of the larva, forming a small tuft of cilia, shown 
in fig. 4. The second ciliated region is found on the rim of the 
larva, forming a belt skirting the outer border. This second region 
or ciliated belt is conspicuous on account of the masses of reddish 
pigment shown in the figure. 
Hanging down from the pole of the larva, opposite the apical 
tuft of cilia, there is a bifid protuberance, from which arise two 
fan-shaped bundles of provisional sete. These setee resemble the 
embryonic setze so common in larval Chetopods. They can be drawn 
together or separated, and are always very conspicuous. Above 
the protuberances from which the spines arise there is a spherical 
darkly pigmented body easily seen through the walls of the larva. 
Under the apex of the larva there is a thickening of the epiblast 
which is connected with the marginal belt by means of a fine thread, 
shown in fig. 4. The apical tuft of cilia rises from this epiblastic 
thickening. The digestive system of our larva is very simple, and 
its yellow walls are readily seen through the sides of the body. It 
consists of a long tubular cesophagus, the inner wall of which is 
richly ciliated, opening into an elongated stomach, simple and 
without cilia*. The mouth lies just inside the ciliated rim or 
belt, and is separated from the stomach by the globular body, at 
the base of the spine-bearing protuberance on the lower pole of the 
larva. 
The larva is, when expanded, from -15 to -2 millim. in diameter. 
Only a single stage in the growth of this Tae was found, and 
consequently “its adult form is unknown. 
* No external opening of the stomach through an intestine was ob- 
served. 
