20 
HELIX (MACULARIA) PUNCTATA. 
Jan., 1890. 
elementary biological text-books ; I shall therefore pass 
directly to my subject without further note. 
The genital aperture is placed in the position which 
generally obtains among the Stylommatopliora. The 
ovotestis is white, follicular, and small; it lies in the left 
lobe of the gland of the mid-intestine in the apical whorls 
of the spire. The hermaphrodite duct is long, thin, and some¬ 
what brownish, and leaves the ovotestis as a convoluted 
tube, which, after running through the left gland of the 
mid-intestine, passes underneath the stomach to. the left 
side of the coelom, and then, being applied to the side of the 
albuminiparous gland, it becomes straight and enters that 
gland by a knobbed extremity to unite with its duct, and 
become the common generative canal. The albuminiparous 
gland is linguliform and yellowish-white ; it is placed between 
the right lobe of the gland of the mid-intestine and the 
stomach. The common generative canal is long ; it arises 
from the albuminiparous gland between the right lobe of the 
gland of the mid-intestine and the stomach ; it runs over the 
stomach, and lies to the right of the crop ; it is twisted on 
itself in its course, so that at one portion of the duct the male 
part is ventrally, at another dorsally placed ; the male portion 
is a thin dull-white and thread-like tube intimately connected 
with the female portion, which is larger and has its charac¬ 
teristic foldings and puckerings well marked, the division 
between each puckering being well shown by the interposition 
of a translucent connective tissue septum. There are no 
naked-eye indications of a prostate. The vas deferens is 
exceedingly small at its commencement, and takes a coiled 
course by the side of the oviduct, but slightly ventral to it; it 
runs anteriority by the left-side of the dart-sac, and, turning 
on itself in the angle formed by the junction of the penis and 
vagina, it courses backwards on the right side of the penis, 
and, becoming thicker where the flagellum is given off, 
becomes directly continuous with the penis. The oviduct, is 
long, large, and coiled many times upon itself; it runs 
on the right side of the oesophagus and crop, and after 
passing underneath the spermatheca, it joins this duct on 
its ventral aspect to form the vagina. The Swammer- 
damian vesicle—the globular head of the spermatheca 
—lies directly in front of the anterior end of the right 
lobe of the gland of the mid-intestine, and under the 
posterior end of the nephridium, being separated from this 
last-named organ by the interposition of the hinder part of 
the muscular floor of the mantle-cavity ; it is a reddish, 
rounded, globular expansion, and is seen in this specimen to 
