KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. N:0O (6. 93 
(not winding) canal. From the albuminiparous gland the oviduct continues as a 
strongly thickened straight tube, which passes into the vagina (v.) carrying a sessile 
pear-shaped receptaculum seminis (r. s.). The vagina debouches immediately behind 
and beneath the rectum (r.), and near its opening the vas deferens penetrates the 
body musculature and then runs encluded into it towards the front to the male 
genital opening. Here the vas deferens enters 
again into the body cavity (fig. 49a) and 
passes, after some curls, into the posterior end 
of the penis immediately in front of its re- 
tractor (m.), which is inserted on the right side 
of the body, far behind the anus and far behind 
the insertion of the tentacular muscle. The penis 
proper is rather short, soft, without special ar- 
mature furnished only in its end with a number 
of slightly obliquely running riblets (fig. 49 Db). 
It rested retracted into a long sheath. Close 
by the distal end of the penis sheath or sac the 
right »spin gland>»> (p. d.) joins it, thus being in 
the same relation to the male apparatus as the 
»penis gland>»> in part of the Vaginulidae and in 
Oncidiidae; in the last-named family this organ 
has a habitus that strikingly recalls this »spin 
gland» of Atopos. I therefore consider it possible 
that these organs are homologous and that the 
penis gland of Oncidiidae and Vaginulidae might 
have originated from a »spin gland> like that of 
Atopos, while the corresponding left-sided gland 
has become completely reduced. For such an 
opinion speak also the observations made by Fig. 49. Male genital apparatus of Atopos austra- 
the two SARASIN on the ontogeny of the penis RS SEN dis slandion, ERS RESA 
gland in Vaginula, where it arises apart from its apex; m. muscle of tho sheath (sh); ves. vesicula. 
the penis. They state (p. 98): »Auch die Penis- 
driäse scheint sich von aussen her selbständig als Hautdräse anzulegen und mit der 
Penisscheide secundär zu gemeinsamem Ausfiährgang zu vereinigen.»> 
The nervous system (fig. 50). With SimmrotH I have found the ganglia very 
close together with only a narrow central opening for the passage of the oesophagus. 
The cerebral ganglia (c.) are connected by means of a very broad commissure and 
also by a thin inferior cord, from where a nerve trunk (17) passes towards the mouth. 
From the cerebral ganglia nerve trunks lead to the tentacles (2) and into the mus- 
culature (3), as well as connectives to the buccal ganglia (5), which are situated 
beneath the radula sac (cf. SIMROTH 1891). The posterior half of the nervous ring 
is occupied by the parietal ganglia (par.), which send nerves to the penis and the 
