184 
Prof. F. W. Hutton on the 
infraoesophagal ganglion (fig. 9, d) connected with the others 
on either side. Of the lateral ganglia the anterior lies on the 
commissure connecting the cerebral and pedal ganglia, the 
middle one is small, and the posterior is the largest in the 
system. All the ganglia are coloured yellow. An auditory 
vesicle lies on the lower anterior face of each pedal ganglion 
(fig. 9, h, and 10, a). It is globular, sessile, about - 006 inch 
in diameter, and contains numerous small lenticular otoliths, 
which have a very active movement. These movements, 
however, soon cease; and it is necessary to examine the parts 
quickly in order to see them. A canal, often containing 
otoliths near the vesicle, leads away from it forwards; but I 
have not succeeded in tracing it out; no doubt it proceeds to 
the surface. 
Arnphibola is hermaphrodite; and the reproductive organs 
(fig. 11) are formed on the same pattern as those of other pul- 
monates; but there is no spermotheca. The ovo-testis is a 
large much-ramified organ, of a yellowish-brown colour, oc¬ 
cupying with the liver the whole of the spiral portion of the 
animal. These two organs are so interramified that I have 
found it impossible to separate them completely. The sperma¬ 
tozoa are developed in the interior of the follicles, the ova at 
the ends of them only. From the ovo-testis leads a long zig¬ 
zagged hermaphrodite duct (fig. 11, b)*, which is ciliated in¬ 
ternally and displays active peristaltic movements. Towards 
its anterior end a small pyriform ctecum (fig. 11, c) opens into 
it, and a little below this the duct from the albumen-gland. 
This organ consists of two parts—a large globular albumen- 
gland proper (fig. 11, e) of a bright orange-colour, and an 
accessory gland (fig. 11, d) t, yellow-ochre in colour, formed 
apparently of convoluted ciliated tubes, the function of which 
1 do not know. It contains small hyaline granules, similar to 
those in the albumen-gland, but much smaller. 
Soon after receiving the duct from this gland the herma¬ 
phrodite duct appears to divide into a large sacculated oviduct 
and a narrower but still broad vas deferens. The oviduct, 
however, is so delicate and so firmly bound to the integument 
that I have not been able to satisfy myself as to how it leaves 
the hermaphrodite duct. The oviduct (fig. 11, g) gets gradu¬ 
ally smaller anteriorly. It lies immediately inside of the 
rectum (fig. 2, o), to which it is firmly attached, and appears 
to open inside the respiratory cavity; but of this I am by no 
means certain. The vas deferens (fig. 11,/) J pursues a tor- 
* This is the oviduct of Quoy and Gaimard. 
t This is the swollen end of the uterus of Quoy and Gaimard. 
j This is the uterus of Quoy and Gaimard. 
