DANFORTH: NEW PTEROPOD. 11 
as was just said, anastomoses with a nerve from the pedal gangHon. 
Its distribution in the side of the neck was not traced. 
As stated above, the visceral ganglia are asymmetrical in the num- 
ber of nerves given off, the left giving rise to three while the right has 
only one. The more lateral of the nerves coming from the left vis- 
ceral ganglion (pi. 3, fig. 8, Iv) is larger than either of the two others. 
It arises from the dorsal part of the ganglion near the entrance of 
the pleuro-visceral connective and extends backward to supply the 
left side of the body. The two other nerves arise posteriorly from the 
right side of the ganglion, thus being nearly median in position. The 
one (yt) nearest the commissure is the smaller. Both supply the vis- 
cera. The single nerve {vr) of the right visceral ganglion corresponds 
to the large lateral one of the left in size, place of origin, and distribu- 
tion, except that it differs from that nerve in giving rise, shortly after 
it leaves the ganglion, to a branch that runs to the osphradial ganglion 
(pi. 2, fig. 6, og) which is located on the right side below the osphradium 
previously described. Figure 3 (pi. 1) show^s a section of the osphra- 
dium and its ganglion at o and og. 
Each buccal ganglion, located in front below the esophagus and 
close to the salivary gland, gives rise to a small nerve that runs into 
the gland of that side. There is also an unpaired nerve arising from 
the commissure between the two ganglia. I do not find a second pair 
of buccal nerves such as are described by Pelseneer for most of the 
pteropods. 
Heart and Nephridium. 
The circulation of this animal is rudimentary, and apparently 
largely lacunar in character. As is commonly the case in pteropods, 
there is an auricle and a ventricle, both within a pericardium. This 
pericardium (pi. 2, fig. 6, 'pe) is located on the functionally right side, 
somewiiat ventrally, between the intestine and the thick body wall. 
It extends from a point a little in front of the middle, backward for a 
distance equal to perhaps one sixth of the entire length of the animal. 
Its greatest diameter is in front in the region of the ventricle and the 
inner opening of the nephridium. From this wider anterior portion it 
tapers gradually backward to its narrow posterior end. The side of 
the pericardium towards the periphery of the animal adjoins the body 
wall while the opposite side lies near the intestine but is not in contact 
with it throughout. 
